Low-threshold and high-extinction-ratio optical bistability within a graphene-silicon-based perfect absorber

Zhengzhuo Zhang; Yansong Fan; Qiaoge Sun; Chucai Guo

doi:10.1117/12.2661645

12 April 2023 Low-threshold and high-extinction-ratio optical bistability within a graphene-silicon-based perfect absorber

Zhengzhuo Zhang, Yansong Fan, Qiaoge Sun, Chucai Guo

Author Affiliations +

Proceedings Volume 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022); 125650P (2023) https://doi.org/10.1117/12.2661645
Event: Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 2022, Shanghai, China

Abstract

We propose and numerically simulate a kind of graphene-silicon-based perfect absorber which possesses high-quality optical bistability in the near-IR band. In the structure, monolayer graphene is sandwiched between two silicon layers and is coupled with a 1D dielectric grating. With the help of the absorption rate of the monolayer graphene and the leakage rate of the grating structure, the critical coupling condition is satisfied and the incident light can be almost completely absorbed by the graphene at the resonant wavelength, causing prominent enhancement of electric field and light-matter interaction. Considering the third-order susceptibility of silicon together with the electric field enhancement, the perfect absorber shows significant bistable characteristics with ultralow thresholds and ultrahigh extinction ratio. The demonstrated switching thresholds can be lower than 90 kW/cm², which can be further cut down by changing the structural parameters. The extinction ratio of the bistable states reaches an ultrahigh level of over 30 dB, since the structure is critically coupled with no reflected light coming out at the off state. The proposed bistable structure with compact size, low thresholds and high extinction ratio can be of great applications in the optical communication field.

Citation Download Citation

Zhengzhuo Zhang, Yansong Fan, Qiaoge Sun, and Chucai Guo "Low-threshold and high-extinction-ratio optical bistability within a graphene-silicon-based perfect absorber", Proc. SPIE 12565, Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022), 125650P (12 April 2023); https://doi.org/10.1117/12.2661645

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available