Multifunctional VO2 metasurface thermal emitter with switchable radiation bandwidth and direction
Abstract
The controllability of the spectral width and intensity of long-wave infrared (LWIR) emission is essential for various applications, including optical stealth, infrared radiation sources, and infrared lasers. Here, we proposed a multifunctional LWIR metasurface emitter with a switchable radiation state, which consists of germanium (Ge) rectangular pair resonators placed on a vanadium oxide (VO2) film. By manipulating the reversible metal-to-insulator phase transition of phase change material VO2, the spatial and spectral emission characteristics could be dynamically controlled. The high loss of metallic VO2 enables broadband emission in the LWIR band. The average emissivity in the 8–12 μm range reaches 91.3% and exhibits wide-angle emission properties. When the VO2 is transformed to the insulating phase, the coupling effect of the symmetry-breaking rectangle with two quasi-bound states in the continuum modes enhances the emission intensity of VO2 at a selective wavelength. This results in narrowband emission with a high-quality factor (Q-factor) and high directional selectivity. Notably, the emission peak's linewidth is only 28 nm, with a Q-factor of 293, and the average emissivity in the 8–12 μm range drops to 9.4%. Overall, the proposed metasurface device achieves an LWIR emissivity switching ratio of 9.7 between its two operating modes, showcasing significant differences in spectral and spatial radiation characteristics.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (11)
Fuming Yang
State Key Laboratory of Integrated Optoelectronics and Key Laboratory of UV Light-Emitting Materials and Technology of the Ministry of Education, College of Physics, Northeast Normal University , Changchun 130024,
Zhongzhu Liang
State Key Laboratory of Integrated Optoelectronics and Key Laboratory of UV Light-Emitting Materials and Technology of the Ministry of Education, College of Physics, Northeast Normal University , Changchun 130024,
Xiaoyan Shi
Institute for Carbon Neutralization Technology, College of Chemistry and Materials Engineering
Jinhuan Li
Center for Advanced Optoelectronic Functional Materials Research and Key Laboratory of UV Light-Emitting Materials and Technology of Ministry of Education, College of Physics, Northeast Normal University , Changchun 130024,
Zhe Wu
Siyu Guo
The Key Laboratory of Functional Molecular Solids, Ministry of Education, and Department of Materials Chemistry, School of Chemistry and Materials Science Anhui Normal University Wuhu 241002 P.R. China
Xiangtao Chen
Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University 1 , Guangzhou 510006,
Wenwen Sun
Xintong Wei
State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical Engineering China University of Petroleum (East China) Qingdao China
Jihui Jiang
State Key Laboratory of Integrated Optoelectronics and Key Laboratory of UV Light-Emitting Materials and Technology of the Ministry of Education, College of Physics, Northeast Normal University , Changchun 130024,
Junying Liu