CN219512081U - Device for complex optical constant measurement - Google Patents

Abstract

The utility model relates to a device for measuring complex optical constants, which comprises a laser light source, a photoelectric detector, a computer and a measuring platform. The measuring platform includes a sample fixing platform and a light source fixing platform and a detection The medium sample is fixed on the sample fixed platform, the laser light source is fixed on the light source fixed platform and the laser emission direction faces the medium sample on the sample fixed platform, the photodetector is fixed on the detector fixed platform and detects The direction is towards the medium sample, and the photodetector is connected with the computer to obtain the reflected light intensity from the medium sample and transmit it to the computer. The device has a simple structure and can be used to conveniently measure the complex optical constant of a medium.

Description

Apparatus for the measurement of complex optical constants

technical field

The utility model relates to the technical field of complex optical constant measurement, in particular to a device for complex optical constant measurement.

Background technique

The refractive index of the absorbing medium (such as metal, biological tissue fluid, etc.), its value is characterized by the complex optical constant. This change in form changes the properties of the wave, especially the imaginary part of the refractive index, which is not only the source of the absorption properties of the medium, but also affects the polarization state of reflected light and transmitted light. The study of complex optical constants not only has theoretical significance, but also has high practical application value.

Existing methods and devices for measuring complex optical constants mainly use surface plasmon resonance technology to measure complex optical constants. For example, Chinese patent CN201711310751.3 discloses a metal film measuring device and method based on surface plasmon resonance. The device includes, etc. A waist right-angled prism, the bottom surface of the isosceles right-angled prism is coated with a dielectric film with a thickness of submicron order and a metal film to be measured, and immersed in the solution; the angle of the launch arm of the ellipsometer is rotated to make the isosceles The angle of incident light at the interface between the rectangular prism and the dielectric film is greater than the critical angle of total reflection at the interface, which satisfies the conditions for exciting surface plasmon resonance, and excites surface plasmon resonance on the surface of the metal film to be tested; measures the amplitude of light corresponding to different incident wavelengths Ratio and phase difference, fitting the relationship curve between the amplitude ratio and phase difference and the incident wavelength, calculating and inversion to obtain the thickness and optical constant of the metal film to be measured. However, the complex optical constant of the medium is calculated by measuring the resonance angle, phase difference, etc., and the structure of the instrument is complicated. Some people also invert the complex optical constant of the medium by measuring the real refraction angle of the light passing through the absorbing medium and the displacement of the front and rear spot positions, but this method requires high precision of the instrument.

Contents of the invention

The purpose of the utility model is to provide a device for measuring complex optical constants. The device has a simple structure and can be used to conveniently measure complex optical constants of a medium.

In order to achieve the above object, the technical solution adopted by the utility model is: a device for measuring complex optical constants, including a laser light source, a photodetector, a computer and a measurement platform, and the measurement platform includes a sample fixing platform and can be respectively relatively The sample fixed platform rotates the light source fixed platform and the detector fixed platform. The medium sample is fixed on the sample fixed platform. The laser light source is fixed on the light source fixed platform and the laser emission direction faces the medium sample on the sample fixed platform. The photoelectric detector The detector is fixed on the fixed platform of the detector and the detection direction faces the medium sample. The photodetector is connected with the computer to obtain the reflected light intensity from the medium sample and transmit it to the computer.

Further, the sample fixing platform includes a sample fixing table top, a fixing bracket and a rotating central shaft, the sample fixing table top is fixed on the fixing bracket, and the center of the lower part of the sample fixing table top is fixedly connected to the rotating central shaft; the light source is fixed The platform includes a light source fixed table and a first rotating connecting arm, the first rotating connecting arm is an L-shaped structure, its upper end is connected to the light source fixed table, and its side end is rotatably connected to the rotating central axis, so that the first rotating connecting arm The light source fixing table on it can rotate relative to the central axis of rotation; the detector fixing platform includes a detector fixing table and a second rotating connecting arm, and the second rotating connecting arm is an L-shaped structure, and its upper end is fixed to the detector The table is connected, and its side end is rotatably connected with the central axis of rotation, so that the second rotating connecting arm and the fixed table of the detector on it can rotate relative to the central axis of rotation.

Further, a scale is provided on the sample fixing table so that the light source fixing table and the detector fixing table can rotate accurately relative to the center of the sample fixing table.

Further, the sample fixing platform includes a sample fixing platform, a fixing bracket, a first rotating drive motor and a second rotating driving motor, the sample fixing platform is fixed on the fixing bracket, and the first rotating driving motor is installed on the sample fixing The center of the lower part of the table, the second rotating drive motor is installed on the center of the bottom surface of the fixed bracket; the light source fixing platform includes a light source fixing table and a third rotating connecting arm, the third rotating connecting arm is an L-shaped structure, and its upper end It is connected with the light source fixed table, and its side end is fixedly connected with the output end of the first rotary drive motor, so as to drive the third rotating connecting arm and the light source fixed table to rotate through the first rotary drive motor; the detector fixed platform includes a detector The fixed table and the fourth rotating connecting arm, the fourth rotating connecting arm is an L-shaped structure, its upper end is connected to the fixed table of the detector, and its side end is fixedly connected to the output end of the second rotating drive motor, so as to pass through the second The rotating drive motor drives the fourth rotating connecting arm and the fixed table of the detector to rotate; the computer is electrically connected to the control terminals of the first rotating driving motor and the second rotating driving motor respectively, so as to control the operation of the rotating driving motor.

Compared with the prior art, the utility model has the following beneficial effects: a device for measuring complex optical constants is provided, which is fixed by designing a sample fixing platform, a light source fixing platform that can rotate relative to the sample fixing platform, and a detector. The platform is used to fix the medium sample, laser light source and photodetector, so that the laser light source can easily change the incident angle of the incident light, and the photodetector can be rotated to the receiving position of the reflected light intensity, and then the incident light intensity and the reflected light can be adjusted. The complex optical constant of the medium is calculated by strong multiple measurements, the structure is simple, easy to realize, and has strong practicability and broad application prospects.

Description of drawings

Fig. 1 is a top view of the device structure of Embodiment 1 of the present utility model.

Fig. 2 is a front view of the device structure of Embodiment 1 of the present utility model.

Fig. 3 is a front view of the device structure of the second embodiment of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

As shown in Figure 1, Embodiment 1 of the present utility model provides a kind of device that is used for complex optical constant measurement, comprises laser light source 1, photodetector 2, computer 4 and measurement platform, and described measurement platform comprises sample fixing platform 4 And the light source fixed platform 5 and the detector fixed platform 7 that can rotate relative to the sample fixed platform respectively, the medium sample 6 is fixed on the sample fixed platform 4, the laser light source 1 is fixed on the light source fixed platform 5 and the laser emission direction is fixed toward the sample The medium sample 6 on the platform, the photodetector 2 is fixed on the detector fixed platform 7 and the detection direction faces the medium sample 6, and the photodetector 2 is connected with the computer 3 to obtain the reflected light intensity from the medium sample and transfer to the computer.

As shown in Figure 2, in the first embodiment, the sample fixing platform 4 includes a sample fixing platform 41, a fixing bracket 42 and a rotation center shaft 43, the sample fixing platform 41 is fixed on the fixing bracket 42, and the sample The center of the lower part of the fixed table top 41 is fixedly connected to the rotating central shaft 43; the light source fixed platform 5 includes a light source fixed table top 51 and a first rotating connecting arm 52, the first rotating connecting arm 52 is an L-shaped structure, and its upper end is connected to the light source. The fixed table top 51 is connected, and its side end is rotatably connected with the rotation center shaft 43, so that the first rotating connecting arm 52 and the light source fixed table top 51 on it can rotate relative to the rotation center shaft 43; the detector fixed platform 7 includes a detector The fixed table 71 of the detector and the second rotating connecting arm 72, the second rotating connecting arm 72 is an L-shaped structure, its upper end is connected with the fixed table 71 of the detector, and its side end is connected with the rotating central axis 43 so that the second The two rotating connecting arms 72 and the detector fixing platform 71 on them can rotate relative to the central axis of rotation.

Preferably, scales are provided on the sample fixing table 41 so as to facilitate accurate rotation of the light source fixing table 51 and the detector fixing table 71 relative to the center of the sample fixing table 41 .

As shown in FIG. 3 , the sample fixing platform and the light source fixing platform may also have different implementation structures. In Embodiment 2 of the present utility model, the sample fixing platform includes a sample fixing table top 41, a fixing bracket 42, a first rotating drive motor 44 and a second rotating driving motor 45, and the sample fixing table top 41 is fixed on the fixing bracket 42 Above, the first rotary drive motor 44 is mounted on the lower center of the sample fixing table 41, and the second rotary drive motor 45 is mounted on the center of the bottom surface of the fixed bracket 42; the light source fixing platform includes a light source fixing table 51 and a third The rotating connecting arm 53, the third rotating connecting arm 53 is an L-shaped structure, its upper end is connected to the light source fixed table 51, and its side end is fixedly connected to the output end of the first rotating drive motor 44, so as to drive through the first rotating The motor drives the third rotating connecting arm and the light source fixed table to rotate; the detector fixing platform includes a detector fixing table 71 and a fourth rotating connecting arm 73, and the fourth rotating connecting arm 73 is an L-shaped structure, and its upper end is connected to the detection The detector fixed table 71 is connected, and its side end is fixedly connected with the output end of the second rotary drive motor 45, so as to drive the fourth rotary connecting arm and the detector fixed table to rotate through the second rotary drive motor.

In order to control the operation of the rotary drive motor, the computer 3 is electrically connected to the control terminals of the first rotary drive motor 44 and the second rotary drive motor 45, so that after a measurement, the first rotary drive motor 44 can be automatically controlled to drive the light source The fixed table 51 is rotated to set an angle, and at the same time, the second rotary drive motor 45 is controlled to rotate the corresponding angle, and then the second measurement is performed.

When the device is in use, firstly, the laser light source 1 injects the laser light with the light intensity I ₀ into the surface of the medium sample at θ _{i 1} , and uses the photodetector 2 to measure the reflected light intensity I _{R 1} . Then rotate the light source fixed table by 90° (at this time, the light source fixed table is rotated to the right side of the normal plane, that is, the side where the original detector fixed table is located), so that the laser is rotated by 90°, and the incident angle is θ _{i 2} =π/ 2- θi ₁ incident medium sample. At the same time, make the fixed table of the detector reversely rotated by 90° (at this time, the fixed table of the detector is reversely rotated to the left side of the normal plane, that is, the side where the fixed table of the original light source is located), so that the reflected light is measured again by the photodetector 2 Strong I _{R 2} . Then, the computer 3 can calculate the complex optical constant of the medium according to the functional relationship between the ratio of the twice reflected light intensity to the incident light intensity and the complex optical constant.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or remodel it into an equivalent change. Equivalent embodiment. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the utility model still belong to the protection scope of the technical solution of the utility model.

Claims (4)

1. The utility model provides a device for complex optical constant measures, its characterized in that includes laser light source, photoelectric detector, computer and measuring platform, measuring platform includes sample fixed platform and can rotate relative sample fixed platform's light source fixed platform and detector fixed platform respectively, and the medium sample is fixed in on the sample fixed platform, laser light source is fixed in on the light source fixed platform and the medium sample on the laser exit direction orientation sample fixed platform, photoelectric detector is fixed in on the detector fixed platform and the detection direction orientation medium sample, photoelectric detector is connected with the computer to obtain the reflection light intensity from the medium sample and transmit to the computer.

2. The device for complex optical constant measurement according to claim 1, wherein the sample fixing platform comprises a sample fixing table surface, a fixing support and a rotation center shaft, the sample fixing table surface is fixed on the fixing support, and the center of the lower part of the sample fixing table surface is fixedly connected with the rotation center shaft; the light source fixing platform comprises a light source fixing table top and a first rotary connecting arm, the first rotary connecting arm is of an L-shaped structure, the upper end of the first rotary connecting arm is connected with the light source fixing table top, and the side end of the first rotary connecting arm is rotationally connected with the rotary central shaft, so that the first rotary connecting arm and the light source fixing table top on the first rotary connecting arm can rotate relative to the rotary central shaft; the detector fixing platform comprises a detector fixing table top and a second rotary connecting arm, the second rotary connecting arm is of an L-shaped structure, the upper end of the second rotary connecting arm is connected with the detector fixing table top, and the side end of the second rotary connecting arm is rotationally connected with the rotary central shaft, so that the second rotary connecting arm and the detector fixing table top on the second rotary connecting arm can rotate relative to the rotary central shaft.

3. The apparatus for complex optical constant measurement according to claim 2, wherein the sample holding stage is provided with graduations to facilitate accurate rotation of the light source holding stage and the detector holding stage with respect to the center of the sample holding stage.

4. The apparatus for complex optical constant measurement according to claim 1, wherein the sample fixing stage comprises a sample fixing stage surface, a fixing support, a first rotary driving motor and a second rotary driving motor, the sample fixing stage surface is fixed on the fixing support, the first rotary driving motor is installed at the center of the lower part of the sample fixing stage surface, and the second rotary driving motor is installed at the center of the bottom surface of the fixing support; the light source fixing platform comprises a light source fixing table top and a third rotary connecting arm, the third rotary connecting arm is of an L-shaped structure, the upper end of the third rotary connecting arm is connected with the light source fixing table top, and the side end of the third rotary connecting arm is fixedly connected with the output end of the first rotary driving motor so as to drive the third rotary connecting arm and the light source fixing table top to rotate through the first rotary driving motor; the detector fixing platform comprises a detector fixing table top and a fourth rotary connecting arm, the fourth rotary connecting arm is of an L-shaped structure, the upper end of the fourth rotary connecting arm is connected with the detector fixing table top, and the side end of the fourth rotary connecting arm is fixedly connected with the output end of the second rotary driving motor so as to drive the fourth rotary connecting arm and the detector fixing table top to rotate through the second rotary driving motor; the computer is electrically connected with the control ends of the first rotary driving motor and the second rotary driving motor respectively so as to control the rotary driving motor to work.