Affiliation:
1. School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510640, China
2. State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
Abstract
We theoretically proposed a topological multichannel add-drop filter (ADF) and studied its unique transmission properties. The multichannel ADF was composed of two one-way gyromagnetic photonic crystal (GPC) waveguides, a middle ordinary waveguide, and two square resonators sandwiched between them, which can be regarded as two paralleling four-port nonreciprocal filters. The two square resonators were applied with opposite external magnetic fields (EMFs) to support one-way states propagating clockwise and counterclockwise, respectively. On the basis of the fact that the resonant frequencies can be tuned by the EMFs applied to the square resonators, when the intensities of EMFs were the same, the multichannel ADF behaved as a power splitter with a 50/50 division ratio and high transmittance; otherwise, it functioned as a demultiplexer to separate two different frequencies efficiently. Such a multichannel ADF not only possesses excellent filtering performance but also has strong robustness against various defects due to its topological protection property. Moreover, each output port can be switched dynamically, and each transmission channel can operate independently with little crosstalk. Our results have the potential for developing topological photonic devices in wavelength division multiplexing systems.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province
National Key R&D Program of China
R&D projects in key areas of Guangdong Province
Subject
General Materials Science,General Chemical Engineering
Cited by
2 articles.
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