Abstract

Integrating Phase-Change Materials in Meta surfaces Has Emerged as a Powerful Strategy to Realize Optical Devices with Tunable Electromagnetic Responses. Here, Phase-Change Chiral Meta surfaces based on GST-225 Material with the Designed Trapezoid-Shaped Resonators Are Demonstrated to Achieve Tunable Circular Dichroism (CD) Responses in the Infrared Regime. the Asymmetric Trapezoid-Shaped Resonators Are Designed to Support Two Chiral Plasmonic Resonances with OppositeCDresponses for Realizing SwitchableCDbetween Negative and Positive Values using the GST Phase Change from Amorphous to Crystalline. the Electromagnetic Field Distributions of the Chiral Plasmonic Resonant Modes Are Analyzed to Understand the Chiroptical Responses of the Meta surface. Furthermore, the Variations in the Absorption Spectrum and CD Value for the Meta surface as a Function of the Baking Time during the GST Phase Transition Are Analyzed to Reveal the Underlying Thermal Tuning Process of the Meta surface. the Demonstrated Phase-Change Meta surfaces with Tunable CD Responses Hold Significant Promise in Enabling Many Applications in the Infrared Regime Such as Chiral Sensing, Encrypted Communication, and Thermal Imaging.

Department(s)

Mechanical and Aerospace Engineering

Publication Status

Open Access

Comments

U.S. Department of Energy, Grant DE-AC02-06CH11357

International Standard Serial Number (ISSN)

1094-4087

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2024 Optica Publishing Group, All rights reserved.

Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

20 May 2024

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