High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity
With the working frequency of wireless communication systems moving to a higher terahertz (THz) band, the design of high-performance THz wave modulators has become a pivotal issue to be tackled urgently in THz communication. In this paper, we design a high-performance dual-channel photonic crystal m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-03-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/10/3/298 |
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| author | Gaofang Li Jie Tan Yanxia Xu Haoyang Cui Bo Tang Zhejing Jiao Wei Zhou Jundong Zeng Nenghong Xia |
| author_facet | Gaofang Li Jie Tan Yanxia Xu Haoyang Cui Bo Tang Zhejing Jiao Wei Zhou Jundong Zeng Nenghong Xia |
| author_sort | Gaofang Li |
| collection | DOAJ |
| description | With the working frequency of wireless communication systems moving to a higher terahertz (THz) band, the design of high-performance THz wave modulators has become a pivotal issue to be tackled urgently in THz communication. In this paper, we design a high-performance dual-channel photonic crystal modulator to enable ON–OFF regulation of the THz wave based on the defect mode disappearance of combined microcavities. The modulator introduces Y-type line defects into silicon rod photonic crystals as a dual-channel waveguide and the point defects and ring resonator form a combined microcavity. Due to the refractive index of the ring resonator filler, gallium arsenide, it is tunable with pump light excitation, and the defect mode frequency of the combined microcavity can be dynamically changed. Under pump excitation with a wavelength of 810 nm and an intensity of 0.4 μJ/cm<sup>2</sup>, 1.34 THz and 1.83 THz dual-channel waves can be OFF due to the defect mode disappearance of the combined microcavity. This is simulated by the time-domain steady-state response and steady-state THz wave field intensity distribution of the modulator by the finite-difference time-domain method. The results indicate that the dual-channel modulator has large modulation depths of 100% and 99.7%, high modulation rates of 4.05 GHz and 4.17 GHz, and low insertion losses of 0.31 dB and 0.18 dB, which lays foundation for the development of high-speed and low-loss THz communication technology. |
| first_indexed | 2024-03-11T06:01:17Z |
| format | Article |
| id | doaj.art-7897297423094ecdafb98e54678858e5 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-11T06:01:17Z |
| publishDate | 2023-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj.art-7897297423094ecdafb98e54678858e52023-11-17T13:19:04ZengMDPI AGPhotonics2304-67322023-03-0110329810.3390/photonics10030298High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined MicrocavityGaofang Li0Jie Tan1Yanxia Xu2Haoyang Cui3Bo Tang4Zhejing Jiao5Wei Zhou6Jundong Zeng7Nenghong Xia8School of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaState Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaSchool of Electronic and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, ChinaWith the working frequency of wireless communication systems moving to a higher terahertz (THz) band, the design of high-performance THz wave modulators has become a pivotal issue to be tackled urgently in THz communication. In this paper, we design a high-performance dual-channel photonic crystal modulator to enable ON–OFF regulation of the THz wave based on the defect mode disappearance of combined microcavities. The modulator introduces Y-type line defects into silicon rod photonic crystals as a dual-channel waveguide and the point defects and ring resonator form a combined microcavity. Due to the refractive index of the ring resonator filler, gallium arsenide, it is tunable with pump light excitation, and the defect mode frequency of the combined microcavity can be dynamically changed. Under pump excitation with a wavelength of 810 nm and an intensity of 0.4 μJ/cm<sup>2</sup>, 1.34 THz and 1.83 THz dual-channel waves can be OFF due to the defect mode disappearance of the combined microcavity. This is simulated by the time-domain steady-state response and steady-state THz wave field intensity distribution of the modulator by the finite-difference time-domain method. The results indicate that the dual-channel modulator has large modulation depths of 100% and 99.7%, high modulation rates of 4.05 GHz and 4.17 GHz, and low insertion losses of 0.31 dB and 0.18 dB, which lays foundation for the development of high-speed and low-loss THz communication technology.https://www.mdpi.com/2304-6732/10/3/298modulatorterahertz wavephotonic crystalcombined microcavity |
| spellingShingle | Gaofang Li Jie Tan Yanxia Xu Haoyang Cui Bo Tang Zhejing Jiao Wei Zhou Jundong Zeng Nenghong Xia High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity Photonics modulator terahertz wave photonic crystal combined microcavity |
| title | High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity |
| title_full | High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity |
| title_fullStr | High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity |
| title_full_unstemmed | High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity |
| title_short | High-Performance Dual-Channel Photonic Crystal Terahertz Wave Modulator Based on the Defect Mode Disappearance of a Combined Microcavity |
| title_sort | high performance dual channel photonic crystal terahertz wave modulator based on the defect mode disappearance of a combined microcavity |
| topic | modulator terahertz wave photonic crystal combined microcavity |
| url | https://www.mdpi.com/2304-6732/10/3/298 |
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