Xu H, Cheng J, Huang Q, Luo M, Li D, Zhu D, Zhan G, Zheng Q, Zhang Y, Shao J, Wu C. Flexible broadband metamaterial absorber in long-wave infrared with visible transparency fabricated by laser direct writing.
OPTICS LETTERS 2024;
49:89-92. [PMID:
38134161 DOI:
10.1364/ol.509760]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 11/26/2023] [Indexed: 12/24/2023]
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 14 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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