Advanced Photonics Nexus, Volume. 3, Issue 3, 036004(2024)
Frequency-dependent selectively oriented edge state topological transport
Fig. 1. Schematic of the FSDT topological photonic device, which has the intriguing frequency multiplexing feature that edge states of different frequencies selectively transport in different edge channels.
Fig. 2. Broadband spoof SPP valley TPCs. (a) Schematic illustration of the designed TPC structure composed of VPCs with inverted symmetry, where the rhomboidal unit cell consists of inequivalent metallic rods with different radii and heights on top of a metal surface. The green line denotes the zigzag-shaped domain wall. (b) Band diagram of the VPCs with and without inversion symmetry, where the blue, red, and black lines represent the dispersions of the VPCs with inversion symmetry, without inversion symmetry, and the light line in air, respectively. The light-yellow region corresponds to the common PBG of the VPCs. Left inset: first Brillouin zone of the VPCs. (c) Simulated eigenmode profiles at
Fig. 3. Valley topological edge states and PBGs. (a) and (b) Evolution of the working bandwidths of the VPC-PBG, TPC-edge states, and TPC-PBG1 with respect to the perturbations of height difference
Fig. 4. Concept of the broadband FSDT topological photonic device. (a) Design strategy of the FSDT device composed of two valley TPCs with different heights
Fig. 5. Experimental observation of the broadband FSDT device. (a) Photograph of the experimental sample of the topological photonic device, which is composed of TPC I and TPC II. The blue and red lines represent the positions of the domain walls of TPC I and TPC II, respectively. (b)–(d) Experimentally recorded transmission spectra (in dB) at ports S1 and S5 when the source is placed at ports S3, S2, and S4, respectively. The transmission spectrum corresponding to port 1 is shown as the solid blue line, while that for port 5 is shown as the solid red line. The insets on the right in each figure are the experimental
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Jiajun Ma, Chunmei Ouyang, Yuting Yang, Xinyue Qian, Li Niu, Yi Liu, Quan Xu, Yanfeng Li, Zhen Tian, Jianqiang Gu, Jiaguang Han, Weili Zhang. Frequency-dependent selectively oriented edge state topological transport[J]. Advanced Photonics Nexus, 2024, 3(3): 036004
Category: Research Articles
Received: Dec. 4, 2023
Accepted: Mar. 26, 2024
Published Online: Apr. 18, 2024
The Author Email: Ouyang Chunmei (cmouyang@tju.edu.cn), Yang Yuting (yangyt@cumt.edu.cn), Zhang Weili (weili.zhang@okstate.edu)