4.6 Article

All-optical mode switching with a graphene-buried polymer waveguide directional coupler

Journal

OPTICS LETTERS
Volume 47, Issue 10, Pages 2414-2417

Publisher

Optica Publishing Group
DOI: 10.1364/OL.458204

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  1. City University of Hong Kong [7005224]

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We demonstrate all-optical mode switching using a graphene-buried polymer waveguide asymmetric directional coupler. The device utilizes the photothermal effect of graphene to achieve efficient switching between different modes. The graphene-buried polymer waveguide offers potential for low-power all-optical control devices.
We demonstrate all-optical mode switching with a graphene-buried polymer waveguide asymmetric directional coupler (DC) by using the photothermal effect of graphene, where TE-polarized pump light and TM-polarized signal light are employed to maximize pump absorption and minimize graphene-induced signal loss. Our experimental device, which uses a graphene length of 6.2 mm, shows a pump absorption of 3.4 dB (at 980 nm) and a graphene-induced signal loss of 0.1 dB. The device can spatially switch between the fundamental mode and the higher-order mode with extinction ratios larger than 10dB (at 1580 nm) and switching times slightly shorter than 1 ms at a pump power of 36.6 mW. Graphene-buried polymer waveguides offer many new possibilities for the realization of low-power all-optical control devices. (C) 2022 Optica Publishing Group

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