Acta Optica Sinica, Volume. 42, Issue 9, 0913001(2022)
On-Chip Terahertz Demultiplexer and Grating Coupler Based on Reverse Design
Fig. 2. Initial layout diagram of terahertz demultiplexer. (a) Initial three-dimensional structure; (b) top view of structure; (c) section view of waveguide structure
Fig. 3. Optimized structure and electric field intensity distribution of terahertz demultiplexer. (a) Top view of device; (b) electric field intensity diagram of 0.500 THz frequency for terahertz wave incident from Port1; (c) electric field intensity diagram of 0.417 THz frequency for terahertz wave incident from Port1; (d) electric field intensity diagram of 0.500 THz frequency for terahertz wave incident from Port2; (e) electric field intensity diagram of 0.417 THz frequency for terahertz wave terahertz incident from Port3
Fig. 4. Spectrum diagram of terahertz demultiplexer at two output ports. (a) Before bandwidth optimization; (b) after bandwidth optimization
Fig. 5. Schematic of initial layout of terahertz grating coupler. (a) Three-dimensional structure diagram of device; (b) top view of device; (c) symmetrical section view of device
Fig. 6. Optimized structure of grating coupler. (a) Variation curve of objective function value with number of iterations; (b) grating structure diagram after continuous optimization; (c) local magnification map after continuous optimization; (d) local magnification map after discrete optimization
Fig. 7. Discrete optimization structure and simulation results of grating coupler. (a) Optimized structure of terahertz grating coupler; (b) electric field intensity distribution diagram
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Guofeng Zhu, Zhenrong Dai, Xuewei Ju, Shuncong Zhong, Xiangfeng Wang, Feng Huang. On-Chip Terahertz Demultiplexer and Grating Coupler Based on Reverse Design[J]. Acta Optica Sinica, 2022, 42(9): 0913001
Category: Integrated Optics
Received: Oct. 9, 2021
Accepted: Nov. 17, 2021
Published Online: May. 6, 2022
The Author Email: Feng Huang (huangf@fzu.edu.cn)