Photonics Research, Volume. 10, Issue 4, 1090(2022)
Terahertz topological photonic waveguide switch for on-chip communication
Fig. 1. (a) THz topological photonic waveguide switch based on valley kink state. (b) Unit cell of the valley photonic crystal containing two types of triangular holes A and B with different sizes of a nonzero
Fig. 2. (a) Optical image of the fabricated straight and bent VPC waveguide. (b) Optical microscopy image of the domain wall with opposite
Fig. 3. (a) Transmission spectra of the straight VPC for different S parameters. (b) Transmission spectra of the bent VPC for different S parameters. (c) Transmission spectra of the bent VPC with pumping light at
Fig. 4. (a) Photo of the experimental setup of the VPC waveguide switch. The pumping light is a fiber-coupled laser at 447 nm. The blue dashed double-head arrow indicates that the pumping light can be adjusted vertically. (b) The light spot was scanned from position 1 to position 5 to locate the best pumping position to the VPC waveguide. (c) Transmission spectra of various pumping positions at the same pumping intensity of
Fig. 5. Schematic of an interchip communication system based on VPC waveguides. The pumping light can switch off the undesired channel to eliminate the interference. The black dashed line represents the undesired data transmission from Chip 1 to Chip 4, which interferes with the communication between Chip 5 and Chip 4 (marked by the solid green arrow).
Fig. 6. (a) Schematic of photoexcited free-carrier lifetime measurement. The THz signal transmitted through the VPC device and was attenuated by the photoexcited carriers, which were generated by a modulated pumping beam shone at an oblique angle. (b) Experimental setup for carrier lifetime measurement.
Fig. 7. Modulation depth as a function of modulation frequency, showing the 3 dB modulation bandwidth of
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Xudong Liu, Jialiang Huang, Hao Chen, Zhengfang Qian, Jingwen Ma, Xiankai Sun, Shuting Fan, Yiwen Sun. Terahertz topological photonic waveguide switch for on-chip communication[J]. Photonics Research, 2022, 10(4): 1090
Category: Integrated Optics
Received: Dec. 23, 2021
Accepted: Feb. 24, 2022
Published Online: Mar. 28, 2022
The Author Email: Shuting Fan (shutingfan@szu.edu.cn), Yiwen Sun (ywsun@szu.edu.cn)