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Dynamic Wavelength‐Selective Diffraction and Absorption with Direct‐Patterned Hydrogel Metagrating.

Authors :
Dai, Chenjie
Li, Xinglong
Yang, Wen‐xing
Chen, Yan
Zheng, Dingshan
Cheng, Nian
Shui, Tao
Zhang, Huafeng
Li, Zhongyang
Source :
Advanced Science; 12/11/2024, Vol. 11 Issue 46, p1-7, 7p
Publication Year :
2024

Abstract

Hydrogel nanophotonic devices exhibit attractive tunable capabilities in structural coloration and optical display. However, current hydrogel‐based tunable strategies are mostly based on a single physical mechanism, and it remains a challenge to merge multiple mechanisms for active devices with integrated functionalities. Here, a hydrogel metagrating combining Fabry‐Pérot (FP) resonance and diffraction effects is proposed for achieving tunable absorption and dynamic wavelength‐selective beam steering. Through exploiting hydrogel shrinkage under electron‐beam exposure, a hydrogel nanocavity composed of Ag/Hydrogel/Ag three‐layer films can be directly printed with arbitrary patterns, enabling the direct‐pattering technique of metagrating. The hydrogel nanocavity performs as an FP‐type absorber, and its absorption peak rapidly shifts with humidity variation due to the hydrogel layer scaling. The response speed is <320 ms, and the absorption peak shift range is >150 nm. It is further demonstrated that the hydrogel metagrating exclusively deflects light at the resonance wavelength, and its operating wavelength can be actively switched by regulating ambient humidity. The proposed tunable hydrogel metagrating can promote new technologies of tunable metasurfaces for optical filtering, gas sensing, and optical imaging. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21983844
Volume :
11
Issue :
46
Database :
Complementary Index
Journal :
Advanced Science
Publication Type :
Academic Journal
Accession number :
181569356
Full Text :
https://doi.org/10.1002/advs.202408960