Chinese Journal of Lasers, Volume. 48, Issue 16, 1614001(2021)
Simulation and Analysis of Performance of Terahertz Photoconductive Antenna with Square Split-Ring Resonators
Figures & Tables(11)
Fig. 1. Basic structure of photoconductive antenna. (a) Structure of dipole photoconductive antenna; (b) structure of split-ring resonators; (c) structure of microstructure photoconductive antenna
Fig. 2. Radiation at different resonant frequencies. (a)Time-domain spectrum; (b) frequency-domain spectrum
Fig. 3. Influence of different local modes loss on radiation waveform. (a) Time-domain spectrum; (b) frequency-domain spectrum
Fig. 4. Influence of different coupling coefficients on radiation waveform. (a) Time-domain spectrum; (b) frequency-domain spectrum
Fig. 5. Influence of L2 structural parameters on terahertz radiation waveform. (a) Time-domain spectrum; (b) frequency-domain spectrum
Fig. 6. Influence of L4 structural parameters on terahertz radiation waveform. (a) Time-domain spectrum; (b) frequency-domain spectrum
Fig. 7. Influence of Ld interpolar gap parameters on terahertz radiation waveform. (a) Time-domain spectrum; (b) frequency-domain spectrum
Fig. 8. Far-field radiation pattern of dipole antenna. (a) XZ plane; (b) YZ plane; (c) XY plane
Fig. 9. Far-field radiation pattern of microstructured photoconductive antenna. (a) XZ plane; (b) YZ plane; (c) XY plane
Table 1. Physical parameters of simulation experiment
View tableTable 1. Physical parameters of simulation experiment
Simulation parameter Symbol Value Unit Absolute temperature T 300 K Boltzmann constant KB 1.380649×10-23 J/K Electron charge e 1.6×10-19 C Laser frequency νopt 375 THz Laser wavelength λ 800 nm Power reflection coefficient R 0.318 Optical absorption coefficient α 60000 cm-1 Electron carrier lifetime τn 0.1 ps Hole carrier lifetime τp 0.4 ps Electron mobility μn 400 cm2 /Vs Hole mobility μp 100 cm2 /Vs Carrier recombination time τr 10 ps Permittivity ε 13.18 Bias voltage Vb 50 V Laser repetition frequency frep 80 MHz Laser pulse duration τl 120 fs Laser skin depth TLT_GaAs 1 μm Screening factor ξ 3 Carrier relaxation time τs 0.03 ps Laser excitation area Ld×Ld μm2
Table 2. Structure parameters of photoconductive antenna
View tableTable 2. Structure parameters of photoconductive antenna
Parameter Symbol Value Unit Biased lines L1 1000 μm Width of line L6 10 μm Separation between the lines L3 180,210,240,270,300 μm Photoconductive gap G 10 μm Ground thickness hm 5 μm Width of micro-structural antenna L2 60,70,80,90,100 μm Length of micro-structural antenna L4 110,120,130,140,150 μm Distance between two SRRs on same electrode L5 70 μm Interelectrode gap between electrodes Ld 60,70,80,90,100 μm
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Zhonggang Xiong, Liping Shang, Hu Deng, Linyu Chen, Jieping Yang, Jin Guo, Guilin Li. Simulation and Analysis of Performance of Terahertz Photoconductive Antenna with Square Split-Ring Resonators[J]. Chinese Journal of Lasers, 2021, 48(16): 1614001
Paper Information
Category: terahertz technology
Received: Feb. 3, 2021
Accepted: Apr. 20, 2021
Published Online: Aug. 23, 2021
The Author Email: Zhonggang Xiong (xzglsl2013@163.com)
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