Wideband mid-infrared thermal emitter based on stacked nanocavity metasurfaces

作     者：Tun Cao Meng Lian Kuan Liu Xianchao Lou Yaoming Guo Dongming Guo Tun Cao;Meng Lian;Kuan Liu;Xianchao Lou;Yaoming Guo;Dongming Guo

作者机构：School of Optoelectronic Engineering and Instrumentation ScienceDalian University of TechnologyDalianPeople’s Republic of China Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of EducationDalian University of TechnologyDalianPeople’s Republic of China 

出 版 物：《International Journal of Extreme Manufacturing》 (极端制造（英文）)

年 卷 期：2022年第4卷第1期

页      面：133-141页

核心收录：

学科分类：08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：support from the National Key Research and Development Program of China(2019YFA0709100,2020YFA0714504) Fundamental Research Funds for the Central Universities(Nos.DUT20GF108,DUT20RC(3)007,DUT20RC(3)062,DUT19RC(3)010) the Program for Liaoning excellent Talents in University(Grant No.LJQ2015021)。 

主　　题：mid-infrared wideband perfect thermal radiation surface plasmon resonance metasurface nanocavity 

摘      要：Efficient thermal radiation in the mid-infrared(M-IR)region is of supreme importance for many applications including thermal imaging and sensing,thermal infrared light sources,infrared spectroscopy,emissivity coatings,and camouflage.The ability to control light makes metasurfaces an attractive platform for infrared applications.Recently,different metamaterials have been proposed to achieve high thermal radiation.To date,broadening the radiation bandwidth of a metasurface emitter(meta-emitter)has become a key goal to enable extensive applications.We experimentally demonstrate a broadband M-IR thermal emitter using stacked nanocavity metasurface consisting of two pairs of circular-shaped dielectric(Si;N;)–metal(Au)stacks.A high thermal radiation can be obtained by engineering the geometry of nanocavity metasurfaces.Such a meta-emitter provides wideband and broad angular absorptance of both p-and s-polarized light,offering a wideband thermal radiation with an average emissivity of more than 80%in the M-IR atmospheric window of 8–14μm.The experimental illustration together with the theoretical framework establishes a basis for designing broadband thermal emitters,which,as anticipated,will initiate a promising avenue to M-IR sources.