High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials
<p>(<b>a</b>) Schematic of the unit structure of a tunable perfect absorber based on periodically patterned graphene; (<b>b</b>) three-dimensional schematic of the absorber; (<b>c</b>) structural diagram of the top layer of graphene; (<b>d</b>) absorption spectra of the proposed perfect absorber (black solid line), the structure with only circular graphene arrays (red dashed line), the structure with only “L” shaped graphene arrays (blue dashed line), and the structure with only “+” shaped graphene arrays (green dashed line); (<b>e</b>) top view of the “+”-shaped graphene layer’s unit structure; (<b>f</b>) top view of four “L”-shaped graphene layer’s unit structures; (<b>g</b>) top view of a circular graphene layer’s unit structure; (<b>h</b>) top view of a patterned graphene layer’s unit structure.</p> "> Figure 2
<p>(<b>a</b>–<b>c</b>) Electric field strength distribution at the top of the absorber in the x-y plane for different resonant frequencies; (<b>d</b>–<b>f</b>) electric field intensity distribution in the x-z plane at different resonant frequencies; (<b>g</b>–<b>i</b>) electric field intensity distribution in the y-z plane at different resonant frequencies. The resonant frequencies are f1 = 1.55 THz, f2 = 4.19 THz, and f3 = 6.92 THz.</p> "> Figure 3
<p>The absorption spectra of fixed, patterned, circular, and “+” shape graphene parameters with the “L” shape’s width W2 changing from 0.20 μm to 0.30 μm.</p> "> Figure 4
<p>Absorption spectra of the fixed patterned circular and “L” shape graphene parameters with the “+” shape’s length L1 changing from 1.3 μm to 2.1 μm.</p> "> Figure 5
<p>Absorption spectra of fixed patterned rings and “L” shape graphene parameters with “+” shape’s width W1 changing from 0.1 μm to 2.1 μm.</p> "> Figure 6
<p>Absorption spectra of the fixed patterned “+” and “L” shape graphene parameters with a change in the width of the rings from 0.4 μm to 0.8 μm.</p> "> Figure 7
<p>Absorption spectra of the fixed patterned graphene for each parameter, with the thickness of the dielectric layer H2 changing from 2.02 μm to 7.02 μm.</p> "> Figure 8
<p>(<b>a</b>) Absorption spectra obtained by changing the chemical potential of graphene from 0.6 to 1.4 eV; (<b>b</b>,<b>c</b>) the resonance frequency and peak absorption intensity spectra of the three modes with the change in chemical potential, respectively.</p> "> Figure 9
<p>(<b>a</b>) Absorption spectra of the absorber for different relaxation times <span class="html-italic">τ</span>. (<b>b</b>) Absorption peak versus relaxation time <span class="html-italic">τ</span> for modes A, B, and C.</p> "> Figure 10
<p>(<b>a</b>) Absorption spectra of mode A, mode B, and mode C at different refractive indices; (<b>b</b>,<b>c</b>) linear relationship between resonant frequency and refractive index; (<b>d</b>) linear relationship between absorption peaks and refractive index.</p> "> Figure 11
<p>(<b>a</b>) Absorption spectra for different polarization angles; (<b>b</b>,<b>c</b>) the absorption spectra of incident light at angles of incidence ranging from 0°to 50° for TE polarization and TM polarization, respectively.</p> ">
Abstract
:1. Introduction
2. Structure and Theory
3. Results and Discussion
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Structure | Sensitivity (RIU−1) | FOM (Max) | Q | Tunability | Absorption Peak Number | Ref. |
---|---|---|---|---|---|---|
Microfiber and MoTe2 | 590 (nm/RIU) | 55 | / | No | 1 | [54] |
Graphene and AL2O3 | 282 (nm/RIU) | 34.3 | / | Yes | 1 | [61] |
Graphene and SIO2 | 942.6 (nm/RIU) | / | / | Yes | 3 | [62] |
Graphene and STO | 50 (GHz/RIU) | 0.33 | 14 | Yes | 2 | [63] |
Graphene and Au | 15.0 (um/RIU) | 4.19 | / | Yes | 1 | [64] |
Graphene and Glass | 113.9 (GHz/RIU) | 3.15 | 11.22 | Yes | 1 | [65] |
Graphene and Cu | 382 (GHz/RIU) | 3.24 | 58.64 | Yes | 3 | This work |
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Zhu, A.; Bu, P.; Cheng, L.; Hu, C.; Mahapatra, R. High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials. Photonics 2024, 11, 469. https://doi.org/10.3390/photonics11050469
Zhu A, Bu P, Cheng L, Hu C, Mahapatra R. High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials. Photonics. 2024; 11(5):469. https://doi.org/10.3390/photonics11050469
Chicago/Turabian StyleZhu, Aijun, Pengcheng Bu, Lei Cheng, Cong Hu, and Rabi Mahapatra. 2024. "High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials" Photonics 11, no. 5: 469. https://doi.org/10.3390/photonics11050469