Tunable Slow Light Performance Based on Graphene Metasurface

Fig. 4. Physical mechanism of PIT. (a) Electric field distribution at dip A, f=0.929 THz; (b) electric field distribution at peak B, f=1.016 THz; (c) electric field distribution at dip C, f=1.037 THz; (d) current distribution at dip A; (e) current distribution at peak B; (f) current distribution at dip C

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Fig. 5. Dynamic control by the Fermi levels. (a) Transmission spectrum at different Fermi levels; (b) influence of Fermi levels on resonance

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Fig. 6. Voltage modulation. (a) Relationship between Fermi levels and bias voltages; (b) relationship between graphene dielectric constant real part and frequency; (c) relationship between gold dielectric constant real part and frequency

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Fig. 7. Modulation of structural transmission spectra. (a) Voltage modulation; (b) graphene width modulation

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Fig. 8. Dynamic adjustability of the slow light performance. (a) Group delay; (b) group index; (c) relationship between group delay and bias voltage; (d) relationship between the delay bandwidth product and the bias voltage

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Table 1. Influence of bias voltage on slow light performance
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Table 1. Influence of bias voltage on slow light performance
Voltage /V Group delay /ps Group index DBP Q value
0 14.30 -22.54 0.34 42.33
10 22.92 106.96 1.47 15.88
20 29.15 107.01 2.16 13.73
30 35.25 173.90 2.78 12.86
40 39.89 225.09 3.27 12.39
50 44.11 276.19 3.66 12.24

Table 2. Influence of graphene width on slow light performance when $V_{g} = 30 V$
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Table 2. Influence of graphene width on slow light performance when $V_{g} = 30 V$
w₂ /μm Group delay /ps Group index DBP Q value
5 35.25 173.90 2.78 12.86
4 47.09 290.68 4.02 11.94
3 66.76 435.90 6.19 11.01
2 93.12 756.67 9.31 10.19

Table 3. Comparison of slow light performance between proposed structure and other structures
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Table 3. Comparison of slow light performance between proposed structure and other structures
Ref. Group delay /ps Group index DBP Adjustability（Y/N）
［25］ 31.35 30 0.62 Y
［26］ 614.00 103 0.45 N
［27］ 0.16 52 0.82 N
［28］ - 26 0.31 Y
［29］ 0.49 586 0.35 Y
Proposed 93.12 757 9.31 Y

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Yi Ma, Jingyu Guo, Lin Chen. Tunable Slow Light Performance Based on Graphene Metasurface[J]. Acta Optica Sinica, 2023, 43(16): 1623025

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Paper Information

Category: Optical Devices

Received: Apr. 13, 2023

Accepted: May. 6, 2023

Published Online: Aug. 15, 2023

The Author Email: Chen Lin (linchen@usst.edu.cn)

DOI:10.3788/AOS230810

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Influence of bias voltage on slow light performance

Table 1. Influence of bias voltage on slow light performance

Table 2. Influence of graphene width on slow light performance when Vg=30 V

Table 2. Influence of graphene width on slow light performance when Vg=30 V

Table 3. Comparison of slow light performance between proposed structure and other structures

Table 3. Comparison of slow light performance between proposed structure and other structures

Table 2. Influence of graphene width on slow light performance when $V_{g} = 30 V$

Table 2. Influence of graphene width on slow light performance when $V_{g} = 30 V$