期刊
OPTICS LETTERS
卷 48, 期 5, 页码 1256-1259出版社
Optica Publishing Group
DOI: 10.1364/OL.483817
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An ultracompact terahertz mode division multiplexer based on THz spoof SPPs is proposed. The mode multiplexer can be designed with a reduced footprint by exploiting more degrees of freedom in the parameters of the unit cell. It can simultaneously support the propagation of four mode channels: TM0, TM1, TM2, and TM3 modes.
In this Letter, an ultracompact terahertz (THz) mode divi-sion multiplexer based on THz spoof surface plasmon polaritons (SPPs) is proposed. Compared with traditional optical multiplexing devices, the proposed mode multiplexer can be designed with a reduced footprint by exploiting more degrees of freedom in the parameters of the unit cell, namely a rectangular metallic pillar. The ultracompact mode division multiplexer can simultaneously support the propa-gation of four mode channels: the TM0, TM1, TM2, and TM3 modes. Then, we numerically evaluate the performance of a cascaded plasmonic mode division circuit composed of a mode multiplexer and demultiplexer. The cross talk and excess loss of the whole circuit are lower than -15 dB and 3.7 dB, respectively, for all four mode channels at a center frequency of 0.65 THz. The footprint of the whole device is about 27 x 2.3 mm and the length of each coupling region is about 2.7 mm. For the first time, to the best of our knowl-edge, a mode division multiplexer based on THz spoof SPPs is reported, which will form core devices for future THz on-chip multimode communication systems. (c) 2023 Optica Publishing Group
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