Low-Threshold Optical Bistability in the Graphene-Oxide Integrated Asymmetric Nanocavity at Visible Light Frequencies

Zeqiang Wang; Boyuan Cai; Zhengfen Wan; Yunyue Zhang; Xiaoguang Ma; Min Gu; Qiming Zhang

doi:10.3390/nano12071117

Low-Threshold Optical Bistability in the Graphene-Oxide Integrated Asymmetric Nanocavity at Visible Light Frequencies

Nanomaterials (Basel). 2022 Mar 28;12(7):1117. doi: 10.3390/nano12071117.

Authors

Zeqiang Wang^{1

2}, Boyuan Cai^{1

2}, Zhengfen Wan^{1

2}, Yunyue Zhang^{1

2}, Xiaoguang Ma^{1

2}, Min Gu^{1

2}, Qiming Zhang^{1

2}

Affiliations

¹ Institute of Photonic Chips, University of Shanghai for Science and Technology, Shanghai 200093, China.
² Centre for Artificial-Intelligence Nanophotonics, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

Abstract

Here, we propose an optical bistable device structure with a few layers of graphene oxide integrated in the metal-dielectric-metal based asymmetric nanocavity. Through the light confinement in the nanocavity, the third order nonlinear absorption of graphene oxide can be significantly enhanced, which experimentally delivers low-threshold optical bistability at the visible wavelength of 532 nm with only 267 KW/cm² intensity. In addition, the switching threshold can be further reduced via increasing the graphene oxide thickness, hence paving a new way for achieving tunable optical bistable devices at visible light frequencies.

Keywords: graphene oxide; nanocavity; optical bistability.

Abstract

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