Journal
OPTICS EXPRESS
Volume 29, Issue 22, Pages 36111-36120Publisher
Optica Publishing Group
DOI: 10.1364/OE.435579
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Funding
- CAS President's International Fellowship Initiative (PIFI)
- Project of CIOMP-Fudan University Collaborative Research
- Leading Talents and Team Project of Scientific and Technological Innovation for Young and Middle-aged Groups in Jilin Province [20190101012JH]
- Excellent Member of Youth Innovation Promotion Association of the Chinese Academy of Sciences [2014193, Y201836]
- Independent fund of State Kay Laboratory of Applied Optics
- Scientific and Technological Development Project of Jilin Province [20190103014JH]
- National Natural Science Foundation of China [61735018, 61805242]
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Two polarization-dependent broadband absorbers based on a composite metamaterial structure were designed and investigated, showing sensitivity to changes in polarization angle and monotonically varying absorptivity with an increase in polarization angle. This design paves the way for broadband polarization-dependent absorption with bright prospects in thermal detection applications and imaging fields.
Capturing polarization information has long been an important topic in the field of detection. In this study, two polarization-dependent broadband absorbers based on a composite metamaterial structure were designed and numerically investigated. Unlike in conventional metamaterial absorbers, the bottom metallic film is functionalized to achieve a polarization response or broadband absorption. The simulation results show that the type I absorber exhibits TM polarization-dependent broadband absorption (absorptivity>80%) from 8.37 mu m to 12.12 mu m. In contrast, the type II absorber presents TE polarization-dependent broadband absorption (absorptivity>80%) from 8.23 mu m to 11.93 mu m. These devices are extremely sensitive to the change of polarization angle. The absorptivity changes monotonically with an increase of the polarization angle, but it is insensitive to oblique incidence. This design paves the way for realizing broadband polarization-dependent absorption via a simple configuration. It has bright prospects in thermal detection applications and imaging fields. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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