Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Tunable narrowband shortwave-infrared absorber made of a nanodisk-based metasurface and a phase-change material Ge2Sb2Te5 layer

Not Accessible

Your library or personal account may give you access

Abstract

A tunable absorber made of a nanodisk-based metasurface is proposed to realize a narrowband shortwave-infrared (SWIR) perfect absorption. By introducing a phase-change material ${\rm{G}}{{\rm{e}}_2}{\rm{S}}{{\rm{b}}_2}{\rm{T}}{{\rm{e}}_5}$ (GST) layer, we produce a selective and active control of the optical response. It is found that the narrowband absorption of 99.9% can be achieved for amorphous GST (aGST) with a modulation depth of 54.6% at 1931 nm, which is attributed to the strong electric dipole resonance in the germanium nanodisks. Moreover, under the aGST state, the full width at half-maximum of 22 nm can be acquired for a normal TM-polarized wave, and such a nanodisk-based absorber enables a tunable operating wavelength by adjusting the geometrical parameters to realize the spectral selectivity. In addition, the nanodisk-based metasurface nanostructure, combined with a dielectric Bragg reflector with alternately stacked ${\rm{Si}}{{\rm{O}}_2}$ and ${\rm{Ti}}{{\rm{O}}_2}$ layers, can realize the SWIR dual-band absorption for aGST and single-band absorption for crystalline GST through the adjustment of electric and magnetic resonances. The designed absorbers have the potential applications in tunable absorption filter, thermal sensing, and optical signal processing.

© 2020 Optical Society of America

Full Article  |  PDF Article
More Like This
Multichannel tunable narrowband mid-infrared optical filter based on phase-change material Ge2Sb2Te5 defect layers

Kun Zhou, Qiang Cheng, Lu Lu, Bowen Li, Jinlin Song, Mengting Si, and Zixue Luo
Appl. Opt. 59(3) 595-600 (2020)

Realization of a photoswitchable anapole metasurface based on phase change material Ge2Sb2Te5

Xiaoyun Wang, Xiaojing Lu, and Zhengwei Xia
Appl. Opt. 62(35) 9253-9260 (2023)

Efficient dynamic tunable metasurface based on Ge2Sb2Te5 in the near infrared band

Zexu Liu, Bolun Zhang, Yuke Li, Yipan Lou, Yi Lian, Chang Jiang, and Jicheng Wang
Appl. Opt. 62(20) 5508-5515 (2023)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved