Flexible broadband metamaterial absorber in long-wave infrared with visible transparency fabricated by laser direct writing.
Opt Lett
; 49(1): 89-92, 2024 Jan 01.
Article
em En
| MEDLINE
| ID: mdl-38134161
ABSTRACT
Absorption of the long-wave infrared from human beings and the surroundings is a key step to infrared imaging and sensing. Here we demonstrate a flexible and transparent broadband infrared absorber using the photoresist-assisted metamaterials fabricated by one-step laser direct writing. The photoresist is patterned by the laser as an insulator layer as well as a mask to build the complementary bilayer metamaterials without lithography. The average absorptivity is 94.5% from 8 to 14â
µm in experiment due to the broadband destructive interference of the reflected beam explained by the Fabry-Perot cavity model. The proposed absorber is applicable to various substrates with additional merits of polarization insensitivity and large angle tolerance, which offers a promising solution for thermal detection and management.
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MEDLINE
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2024
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Article