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An Omnidirectional Dual-Functional Metasurface with Ultrathin Thickness
Ying Xiong1,2, Xiaoyi Liu3,4, Kai Wang1,2
1Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China.
Materials (Basel, Switzerland)
|December 11, 2022
Summary
This study introduces a novel dual-functional metasurface. This innovative device serves as both a mid-infrared light source for gas sensing and a long-wave infrared absorber for photodetection, offering versatile applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Metasurfaces are widely applied but achieving multiple functions in a single device is challenging.
- Existing metasurfaces often lack versatility, limiting their practical applications in sensing and detection.
Purpose of the Study:
- To propose and demonstrate a novel dual-functional metasurface.
- To enable simultaneous mid-infrared narrowband thermal light emission and long-wave infrared broadband absorption.
- To enhance optical gas sensing and photodetection capabilities with a single device.
Main Methods:
- Tailoring the structure and constituent materials of the metasurface.
- Experimental characterization of optical properties, including absorptivity and emissivity.
- Testing performance under varying polarization and incident angles.
Main Results:
- Achieved over 90% absorptivity in the 8 µm to 14 µm range (long-wave infrared broadband absorber).
- Exhibited 97.4% emissivity at 3.56 μm with a 0.41 µm FWHM (mid-infrared narrowband thermal light source).
- Demonstrated insensitivity to incident angle and polarization (TM and TE).
Conclusions:
- The proposed dual-functional metasurface offers a simple, thin, and versatile solution for optical sensing and detection.
- Its angle and polarization insensitivity simplify integration with existing optical systems.
- Expected to significantly improve the performance of photodetection equipment and imaging systems.
