EP4124210A1 - Vorrichtung zur erfassung einer temperatur, anlage zur herstellung eines optischen elementes und verfahren zur herstellung eines optischen elementes - Google Patents
Vorrichtung zur erfassung einer temperatur, anlage zur herstellung eines optischen elementes und verfahren zur herstellung eines optischen elementesInfo
- Publication number
- EP4124210A1 EP4124210A1 EP20837950.3A EP20837950A EP4124210A1 EP 4124210 A1 EP4124210 A1 EP 4124210A1 EP 20837950 A EP20837950 A EP 20837950A EP 4124210 A1 EP4124210 A1 EP 4124210A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- optical element
- temperature
- radiation
- heating
- thermal radiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/7085—Detection arrangement, e.g. detectors of apparatus alignment possibly mounted on wafers, exposure dose, photo-cleaning flux, stray light, thermal load
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/60—Substrates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/0003—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter
- G01J5/0007—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiant heat transfer of samples, e.g. emittance meter of wafers or semiconductor substrates, e.g. using Rapid Thermal Processing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
- G01J5/061—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by controlling the temperature of the apparatus or parts thereof, e.g. using cooling means or thermostats
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0859—Sighting arrangements, e.g. cameras
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/59—Radiation pyrometry, e.g. infrared or optical thermometry using polarisation; Details thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/005—Testing of reflective surfaces, e.g. mirrors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/08—Mirrors
- G02B5/0891—Ultraviolet [UV] mirrors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/22—Masks or mask blanks for imaging by radiation of 100nm or shorter wavelength, e.g. X-ray masks, extreme ultraviolet [EUV] masks; Preparation thereof
- G03F1/24—Reflection masks; Preparation thereof
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/68—Preparation processes not covered by groups G03F1/20 - G03F1/50
- G03F1/72—Repair or correction of mask defects
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70058—Mask illumination systems
- G03F7/7015—Details of optical elements
- G03F7/70175—Lamphouse reflector arrangements or collector mirrors, i.e. collecting light from solid angle upstream of the light source
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/70216—Mask projection systems
- G03F7/70316—Details of optical elements, e.g. of Bragg reflectors, extreme ultraviolet [EUV] multilayer or bilayer mirrors or diffractive optical elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70858—Environment aspects, e.g. pressure of beam-path gas, temperature
- G03F7/70883—Environment aspects, e.g. pressure of beam-path gas, temperature of optical system
- G03F7/70891—Temperature
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/70—Microphotolithographic exposure; Apparatus therefor
- G03F7/708—Construction of apparatus, e.g. environment aspects, hygiene aspects or materials
- G03F7/70975—Assembly, maintenance, transport or storage of apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
- G21K1/06—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diffraction, refraction or reflection, e.g. monochromators
- G21K1/062—Devices having a multilayer structure
Definitions
- the invention relates to a device for detecting a temperature, a system for producing an optical element and a method for producing an optical element.
- Projection exposure systems for microlithography for the EUV wavelength range from 1-120 nm are dependent on the reflective optical elements used for imaging a mask in an image plane having a high level of surface accuracy.
- masks, as reflective optical elements for the EUV wavelength range should have a high level of precision in their surface shape, since their replacement is reflected in a not inconsiderable way in the operating costs of a projection exposure system.
- Methods for correcting the surface shape of optical elements are in particular from US 6844272 B2, US 6849859 B2, DE 10239859 A1, US 6821 682 B1, US 20040061868 A1, US 20030006214 A1, US 200300081722 A1, US 6898 011 B2, US 7083290 B2, US 7 189655 B2, US 20030058986 A1, DE 102007051 291 A1, EP 1 521 155 A2 and US 4298247 are known.
- correction methods listed in the documents mentioned are based on locally condensing the substrate material of optical elements by irradiation. This results in a change in the surface shape of the optical element in the vicinity of the irradiated areas.
- Other methods are based on a direct surface removal of the optical element.
- Still others of the methods mentioned make use of the thermal or electrical deformability of Materials in order to impress spatially extended surface shape changes on the optical elements.
- DE 102011084117 A1 and WO 2011/020655 A1 disclose methods of adding to the reflective optical element, in addition to correcting the surface shape, before long-term compaction (hereinafter referred to as “compaction”) in the order of a few vol.% Or aging of the substrate material to protect against EUV radiation.
- compaction long-term compaction
- the surface of the reflecting optical element is subjected to radiation homogeneously and thus compressed and / or coated with a protective layer. Both methods prevent the EUV radiation from penetrating the substrate material. In this way, in the long term, impermissible surface deformations caused by the compaction of the material by the EUV radiation can be prevented.
- the reason for the compaction or aging of substrate materials is assumed to be that at the high manufacturing temperatures of the substrate material a thermodynamic imbalance state is frozen, which changes into a thermodynamic basic state with EUV irradiation.
- coatings from SiO2 can be produced which do not show any such compaction, since with an appropriately chosen coating method these layers are produced at significantly lower temperatures than the substrate material.
- the compaction decreases over time, which in turn changes the surface shape.
- This decrease in compaction which is also referred to below as decompactation, is presumably based on a relaxation of the defect states generated in the material by the irradiation.
- the changes in the surface shape caused over time by decompacting during operation at the customer's can be anticipated by tempering the optical Elemen tes during production. As a result, the possibly remaining decompacting and the resulting changes to the surface during operation at the customer's site are reduced to a minimum.
- the optical element is heated homogeneously or locally over a longer period of time to temperatures above the normal operating temperature, which is equivalent to an acceleration and thus an anticipation of the decompacting that takes place over time.
- the disadvantage of the known tempering methods is that the temperature on the surface of the optical element, in particular a temperature profile, can only be measured indirectly.
- the optical element can have recesses from the side surfaces or, in the case of a mirror, from the rear, into which temperature sensors are let. These record the temperature at the end of the recess, which is a few mm away from the surface.
- the surface temperature can be determined indirectly by simulating the heat flow in the optical element. This method has the disadvantage that the temperature measurement is delayed and makes it difficult to regulate the heating power for heating the surface.
- the object of the present invention is to provide a device and a method which eliminate the disadvantages of the prior art described above.
- Another object of the invention is to provide an improved system for producing an optical element.
- the element is arranged in such a way that the majority of the intensity of the thermal radiation detected by the temperature recording device and reflected by reflection on the surface of the optical element is emitted by the element
- the proportion of the intensity of the thermal radiation detected by the temperature recording device and reflected by reflection on the surface of the optical element can be more than 70%, preferably more than 80%, particularly preferably more than 90%.
- a filter in particular a polarization filter, can be arranged in front of the temperature recording device for filtering interfering radiation or for further improving the measurement.
- the thermal radiation reflected on the surface of the element is usually not polarized when incident on the optical element, but can be polarized at suitable angles when reflecting on the optical surface.
- the polarization filter can then be arranged in such a way that the radiation which is at least partially polarized by reflection and which is not desired for the measurement is filtered out. This reduces the portion of the parasitic thermal radiation of the element reaching the temperature recording device compared to the portion of the thermal radiation to be measured from the surface of the optical element, such as a mirror, which is to be recorded to determine the surface temperature.
- the filter can be set up to be rotated about its own axis.
- a known frequency can be impressed on the intensity of the reflected, polarized thermal radiation detected by the temperature device.
- the signal component that is due to reflected (and un- desired) radiation declines easily identified and taken into account when determining the surface temperature of the optical element.
- the surface of the optical element can comprise a coating with an emissivity for the wavelength range detected by the temperature recording device of greater than 0.05, preferably greater than 0.4 and particularly preferably greater than 0.95.
- the surfaces of the optical element usually have coatings for the reflection of electromagnetic radiation with a wavelength between 1 nm and 400 nm. It can therefore be an additional layer, which does not reduce the reflectivity in the range from 1 nm to 400 nm and the emissivity of the surface for a
- Wavelength from 1 pm to 15 pm can increase to the values described above, can be formed on the surface.
- the layer can only be applied temporarily during tempering for measurement or control purposes, that is to say removed again after the tempering process and before the optical element is used, for example in a projection exposure system.
- the surface of the element can be designed in such a way that the emissivity for the wavelength range detected by the temperature recording device is less than 0.4, preferably less than 0.2 and particularly preferably less than 0.05.
- the element can also be coated, in which case a functional layer, as in the case of the optical element for semiconductor lithography, does not have to be taken into account.
- the electromagnetic radiation can include heating radiation for heating the surface of the optical element.
- This can be used, for example, for the targeted heating of the surface of the optical element, for example designed as a mirror, in order to achieve accelerated relaxation, that is to say decompacting, of the surface treated by irradiation and thereby compacted. This reduces the subsequent change in the surface of the mirror over the service life by decompacting to a minimum.
- the invention further includes a system for producing a surface of an optical element for semiconductor lithography with an optical element with a surface irradiated by electromagnetic radiation.
- the system comprises a first heating device, a second heating device and a device according to one of the exemplary embodiments described above.
- the electromagnetic radiation can include thermal radiation in a wavelength range from 800 nm to 15 pm, that is, part of the infrared spectrum.
- At least one heating device can comprise a light source.
- the light source can be set up to provide directed electromagnetic radiation. This can mainly be in the infrared range.
- the light source can comprise a laser or a lamp or a light-emitting diode.
- the light source can also be used for both heating devices or both heating devices can be implemented as light sources, the first heating device emitting a constant heat output over the surface and the second heating device being able to introduce heat locally into the optical element. This can be done, for example, with a scanning laser beam.
- the system can include at least one beam trap.
- the beam trap can be arranged in such a way that the electromagnetic radiation reflected on the optical element is absorbed.
- the power absorbed in the beam trap can, for example, be dissipated in a targeted manner by cooling the beam trap. In this way, an influencing of the determination of the temperature of the surface of the optical element by reflected heat radiation, for example from an enclosure of the system, can be effectively avoided.
- a surface of the housing of the system can be designed in such a way that the emissivity for that detected by the temperature recording device Wavelength range is at least partially smaller than 0.4, preferably smaller than 0.2 and particularly preferably smaller than 0.05.
- the surface of the housing can be coated.
- the invention further includes a method for producing a surface of an optical element of a projection exposure system, the surface being tempered and, according to the invention, the surface temperature being detected during the tempering.
- the surface temperature can be determined by detecting the thermal radiation emitted by the surface.
- the parasitic thermal radiation of an element which is reflected by the temperature detection device and reflected by reflection on the surface of the optical element, can be minimized.
- the parasitic thermal radiation of the element can be minimized by controlling the temperature of the element. If the element is cooled to a very low temperature, the radiated or emitted thermal radiation is smaller than with an element with a high temperature, depending on the wavelength. In the case of a surface of the optical element with a temperature of 100 ° Celsius, for example, the element can be cooled to a temperature of -20 ° Celsius. As a result, the ratio of the spectral radiation densities of the element and the surface of the optical element can be up to 1: 500.
- the temperature recording device which can be designed as a thermal imaging camera, for example, can thereby determine the surface temperature of the optical element with a high degree of accuracy.
- the parasitic thermal radiation of the element can be minimized by an emissivity of the element of less than 0.95, preferably of less than 0.4, particularly preferably less than 0.05. This can lead to a further reduction in the thermal radiation emitted by the element, which further reduces the ratio between the spectral radiation density of the element and the surface of the optically active surface.
- the parasitic thermal radiation of the element can be minimized by filtering the thermal radiation detected by the temperature detection device. For example, the dominant vertically polarized components of the parasitic thermal radiation reflected and thereby polarized on the surface of the optical element can be filtered out.
- the surface can be subjected to a constant slaughtering power with a first slaughtering device.
- the temperature distribution on the irradiated surface caused by the constant heat output is not constant due to differently configured heat flows in the optical element configured, for example, as a mirror.
- the surface at the edge of the mirror can be cooler, since the side surfaces of the mirror that are in contact with the environment create a greater heat flow. More heat is therefore carried away from the surface, which can lead to a lower temperature on the surface in the area of the edge.
- the surface can be subjected to a second meat meat device with a variable meat output.
- variable slaughtering performance can compensate for the described temperature differences on the surface of the mirror by targeted slaughtering in areas with a lower temperature.
- the entire surface of the mirror does not have to be tempered. It is also possible to heat only part of the surface, for which purpose the arrangement must be adapted accordingly.
- the meat performance of the first meat device and / or the second meat device can be based on the detected surface temperature by a control tion can be regulated.
- the surface can be tempered at a constant temperature with an accuracy of +/- 1 K.
- At least one of the meat meat devices can provide the meat performance using directed radiation. This has the advantage that the scattering of the radiation in the system can be reduced to a minimum and the beam trap can absorb a large part of the reflected fleece radiation.
- the area of the optical element that is not irradiated by the meat-cutting devices can be cooled.
- This has the advantage that temperature-sensitive components, such as the connections for manipulators for positioning and aligning the optical element or functional surfaces, are not exposed to the same temperature as on the surface of the optical element.
- the system can be divided into two areas, with a first area being able to include the fusing devices, jet traps and the device for detecting the surface temperature.
- the interface to the second area can run at the edge of the irradiated surface and be designed in such a way that other environmental conditions can be set in the second area than in the first area.
- the cooling can be brought about by forced convection and can be implemented, for example, by gas cooling of the second area.
- Figure 1 shows a basic structure of a system in which the invention can be implemented
- FIG. 2 shows a detailed view of a device for measuring the temperature on a mirror surface
- FIG. 3 shows a diagram in which radiation densities are shown over wavelengths
- FIG. 4 shows a diagram in which the relationship between two radiation densities is shown over the wavelength.
- FIG. 1 shows a system 1 for decompacting optical elements for semiconductor lithography, in particular a mirror 14 which is arranged in a housing 2 of the system 1.
- the housing 2 is divided into two areas by a partition 3.
- the mirror 14 is arranged in the partition 3 in such a way that the part 16 of the surface 15 of the mirror 14, on which the optically active surface is formed and which is referred to below as the irradiated surface 16, is in the upper region of the housing 2, which is designed as an irradiation device 4, is arranged.
- the partition 3 can be dispensed with.
- the cooling device 13 is cooled by a forced convection indicated by the arrows 27.
- the irradiation device 4 comprises a constant light source 5 designed as an LED array, which irradiates the optically active area and its surroundings, which are to be decompacted, with a constant heating power by means of directed heating light 7.
- the front side 15 of the mirror 14 is heated by absorption, with the temperature on the irradiated surface 16 not being constant despite the constant heating power introduced due to different heat flows in the mirror 14.
- variable light source 6 designed as a scanning laser with directed system heating light 8.
- the two light sources 5, 6 can alternatively also be designed as a lamp or any other light source with directed radiation.
- the constant 9 and variable secondary light 10 reflected by the mirror 14, that is to say the light which is not absorbed by the mirror, is captured in beam traps 11, 12 which are also arranged in the irradiation device 4. This largely prevents the housing 2 from heating up, which simplifies the temperature measurement of the irradiated surface 16.
- the temperature of the irradiated area 16 can be set to be constant over the entire area.
- the surface temperature of the irradiated area 16 is determined with a device 20.
- a device 20 This comprises a temperature recording device designed as an infrared camera 21, an element designed as a background element 22 and a controller 24.
- the controller 24 is connected to the device 20 for determining the surface temperature, the irradiation device 4 and the cooling device 13.
- the background element 22 is arranged in the irradiation device 4 in such a way that the thermal radiation 25 from the background element 22 is detected by the infrared camera 21 via a reflection on the irradiated surface 16.
- the infrared camera 21 only sees the heat radiation emitted by the irradiated surface 16 (not shown) and the heat radiation 25 emitted by the background element 22 and reflected by that of the irradiated area 16 -20 ° Celsius is tempered, the ratio of the heat radiation emitted by the surface of the mirror 14, which is relevant for determining the temperature of the irradiated surface 16, and the heat radiation 25 emitted by the background element 22 is so great that the determination of the The surface temperature of the irradiated area is possible with sufficient accuracy of less than ⁇ 0.5 ° K and, in the optimum, less than 0.1 K.
- This ratio can be further increased by setting the emissivities of the background element 22 and the irradiated area 16 for the wavelength range detected by the infrared camera 21.
- the emissivity for the background element 22 is reduced and that of the irradiated surface 16 is increased, which is described below with reference to FIGS. 2, 3 and 4.
- FIG. 2 shows a device 4 for determining the surface temperature of the irradiated area 16.
- the heat radiation 25.1 emitted by the background element 22 is initially not polarized.
- the thermal radiation 25.2 arriving at the infrared camera 21 and reflected at the mirror, which is emitted by the background element 22, is therefore oriented primarily perpendicular to the plane of incidence of the radiation on the mirror 14. This is always the case when the reflection of the thermal radiation 25 takes place with a reflection angle close to the Brewster angle.
- the filter 23 arranged in front of the infrared camera 21 blocks the perpendicular polarization direction, so that only the parallel polarization direction, that is to say the components of the thermal radiation 25.2 oriented parallel to the plane of incidence, strike the infrared camera 21.
- the ratio of thermal radiation 25.2 from background element 22 and thermal radiation 26 from mirror 14 is further reduced in addition to the temperature differences between the surfaces of mirror 14 and background element 22, and the determination of the temperature of irradiated area 16 is simplified as a result.
- FIG. 3 shows a diagram in which the spectral radiation density (W / (m 2 mSr)), hereinafter referred to only as radiation density, is plotted logarithmically over the wavelength (m).
- the wavelength is plotted on the abscissa and the radiation intensities on the ordinate.
- the range delimited on the abscissa with points A and B represents the wavelength range in which the infrared camera detects thermal radiation, which in principle can be in the range from 1pm to 15pm, but in this example is between 2pm and 5pm.
- Curve I shows the radiation intensity of the background element 22 heated to -20 ° Celsius and shown in FIGS. 1 and 2.
- Curves II and III show the radiation intensity of the irradiated surface 16 heated to 100 ° Celsius and shown in FIGS. 1 and 2 Curve II represents the radiation intensity for an emissivity of 0.4 and curve III the radiation intensity for an emissivity of 1.0, i.e. for a blackbody.
- FIG. 4 shows a diagram in which the relationship between the curves I and II shown in FIG. 3 is also plotted logarithmically.
- the wavelength is again plotted on the abscissa and the ratio of the radiation intensities on the ordinate.
- the ratio is between 12 and 1500.
- the emissivity for the irradiated area 16 is at values of 0.05, as is usual with non-optimized coatings, the ratio of the radiation densities is from irradiated Area 16 and Background element 22 is still more than 450, which is sufficient for determining the surface temperature of the irradiated area with an accuracy of +/- GK.
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- Analytical Chemistry (AREA)
- Optics & Photonics (AREA)
- Exposure And Positioning Against Photoresist Photosensitive Materials (AREA)
- Radiation Pyrometers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102020203750.7A DE102020203750A1 (de) | 2020-03-24 | 2020-03-24 | Vorrichtung zur Erfassung einer Temperatur, Anlage zur Herstellung eines optischen Elementes und Verfahren zur Herstellung eines optischen Elementes |
PCT/EP2020/086441 WO2021190780A1 (de) | 2020-03-24 | 2020-12-16 | Vorrichtung zur erfassung einer temperatur, anlage zur herstellung eines optischen elementes und verfahren zur herstellung eines optischen elementes |
Publications (1)
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EP4124210A1 true EP4124210A1 (de) | 2023-02-01 |
Family
ID=74130168
Family Applications (1)
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EP20837950.3A Pending EP4124210A1 (de) | 2020-03-24 | 2020-12-16 | Vorrichtung zur erfassung einer temperatur, anlage zur herstellung eines optischen elementes und verfahren zur herstellung eines optischen elementes |
Country Status (4)
Country | Link |
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US (1) | US20230018331A1 (de) |
EP (1) | EP4124210A1 (de) |
DE (1) | DE102020203750A1 (de) |
WO (1) | WO2021190780A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102023117203A1 (de) | 2023-06-29 | 2025-01-02 | Carl Zeiss Smt Gmbh | Vorrichtung und Verfahren zur Voralterung eines optischen Elements für die Halbleiterlithographie |
DE102023117205A1 (de) | 2023-06-29 | 2025-01-02 | Carl Zeiss Smt Gmbh | Vorrichtung, Verfahren und System zum Kalibrieren der Temperaturmessung an einem optischen Element für die Halbleiterlithographie |
DE102023208308A1 (de) | 2023-08-30 | 2025-03-06 | Carl Zeiss Smt Gmbh | Lithographiesystem mit einer Messeinrichtung |
Family Cites Families (30)
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FR2453423A1 (fr) | 1979-04-04 | 1980-10-31 | Quantel Sa | Element optique epais a courbure variable |
US5710431A (en) * | 1996-09-05 | 1998-01-20 | The United States Of America As Represented By The Secretary Of The Navy | Outdoor scene simulating apparatus for testing an infrared imaging device |
US7155363B1 (en) * | 1997-12-01 | 2006-12-26 | Mks Instruments, Inc. | Thermal imaging for semiconductor process monitoring |
DE19963587B4 (de) * | 1999-12-29 | 2007-10-04 | Carl Zeiss Smt Ag | Projektions-Belichtungsanlage |
US6821682B1 (en) | 2000-09-26 | 2004-11-23 | The Euv Llc | Repair of localized defects in multilayer-coated reticle blanks for extreme ultraviolet lithography |
US6849859B2 (en) | 2001-03-21 | 2005-02-01 | Euv Limited Liability Corporation | Fabrication of precision optics using an imbedded reference surface |
JP4320970B2 (ja) | 2001-04-11 | 2009-08-26 | 株式会社ニコン | 多層膜反射鏡の製造方法 |
US6967168B2 (en) | 2001-06-29 | 2005-11-22 | The Euv Limited Liability Corporation | Method to repair localized amplitude defects in a EUV lithography mask blank |
EP1291680A2 (de) | 2001-08-27 | 2003-03-12 | Nikon Corporation | Multischicht-Spiegel für das ferne UV, und Hertellungsverfahren für solche Spiegel mit verringerten Aberration |
JP2003098297A (ja) | 2001-09-26 | 2003-04-03 | Nikon Corp | 多層膜除去加工装置、多層膜除去加工方法、多層膜反射鏡及びx線露光装置 |
US6844272B2 (en) | 2002-03-01 | 2005-01-18 | Euv Limited Liability Corporation | Correction of localized shape errors on optical surfaces by altering the localized density of surface or near-surface layers |
EP1387220A3 (de) | 2002-07-29 | 2007-01-03 | Canon Kabushiki Kaisha | Justiermethode und -apparat eines optischen Systems, sowie Belichtungsapparat |
US7233009B2 (en) * | 2002-08-27 | 2007-06-19 | Asml Netherlands B.V. | Lithographic projection apparatus and reflector assembly for use therein |
US7662263B2 (en) | 2002-09-27 | 2010-02-16 | Euv Llc. | Figure correction of multilayer coated optics |
US6992306B2 (en) * | 2003-04-15 | 2006-01-31 | Canon Kabushiki Kaisha | Temperature adjustment apparatus, exposure apparatus having the same, and device fabricating method |
JP2005109158A (ja) | 2003-09-30 | 2005-04-21 | Canon Inc | 冷却装置及び方法、それを有する露光装置、デバイスの製造方法 |
JP4482400B2 (ja) | 2004-08-17 | 2010-06-16 | エスアイアイ・ナノテクノロジー株式会社 | Euvlマスクの多層膜中の振幅欠陥修正方法 |
US7279721B2 (en) * | 2005-04-13 | 2007-10-09 | Applied Materials, Inc. | Dual wavelength thermal flux laser anneal |
TWI479271B (zh) * | 2005-11-15 | 2015-04-01 | 尼康股份有限公司 | An exposure apparatus and an exposure method, and an element manufacturing method |
JP5076620B2 (ja) * | 2006-06-07 | 2012-11-21 | 旭硝子株式会社 | ガラス基板表面の平滑化方法 |
DE102007051291B4 (de) | 2007-10-24 | 2010-02-11 | Jenoptik Laser, Optik, Systeme Gmbh | Adaptierbares optisches System |
WO2009081748A1 (ja) * | 2007-12-20 | 2009-07-02 | Toyo University | 放射測温方法及び放射測温システム |
CN102150218B (zh) * | 2008-09-12 | 2014-04-16 | 旭硝子株式会社 | Euvl用光学部件的平滑化方法及光学面平滑化后的euvl用光学部件 |
WO2011020655A1 (en) | 2009-08-18 | 2011-02-24 | Carl Zeiss Smt Gmbh | Substrates and mirrors for euv microlithography, and methods for producing them |
DE102009045193A1 (de) * | 2009-09-30 | 2011-04-14 | Carl Zeiss Smt Gmbh | Optische Anordnung in einem optischen System, insbesondere in einer mikrolithographischen Projektionsbelichtungsanlage |
DE102011084117A1 (de) | 2011-10-07 | 2013-04-11 | Carl Zeiss Smt Gmbh | Reflektives optisches Element für den EUV-Wellenlängenbereich, Verfahren zur Erzeugung und zur Korrektur eines solchen Elements, Projektionsobjektiv für die Mikrolithographie mit einem solchen Element und Projektionsbelichtungsanlage für die Mikrolithographie mit einem solchen Projektionsobjektiv |
DE102015224281A1 (de) * | 2015-03-12 | 2016-09-15 | Carl Zeiss Smt Gmbh | Verfahren zum herstellen eines spiegels für eine lithographieanlage |
DE102017217121A1 (de) * | 2017-09-26 | 2019-03-28 | Robert Bosch Gmbh | Anordnung eines optischen Systems und Temperierungsverfahren |
DE102018211596A1 (de) * | 2018-07-12 | 2020-01-16 | Carl Zeiss Smt Gmbh | Verfahren zur Herstellung eines reflektierenden optischen Elementes einer Projektionsbelichtungsanlage und reflektierendes optisches Element für eine Projektionsbelichtungsanlage, Projektionsobjektiv und Projektionsbelichtungsanlage |
DE102022200976A1 (de) * | 2022-01-31 | 2023-01-05 | Carl Zeiss Smt Gmbh | Kalibrierkörper und Verfahren zur Kalibrierung |
-
2020
- 2020-03-24 DE DE102020203750.7A patent/DE102020203750A1/de not_active Withdrawn
- 2020-12-16 WO PCT/EP2020/086441 patent/WO2021190780A1/de unknown
- 2020-12-16 EP EP20837950.3A patent/EP4124210A1/de active Pending
-
2022
- 2022-09-22 US US17/950,635 patent/US20230018331A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2021190780A1 (de) | 2021-09-30 |
US20230018331A1 (en) | 2023-01-19 |
DE102020203750A1 (de) | 2021-09-30 |
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