Wideband mid-infrared thermal emitter based on stacked nanocavity metasurfaces

Abstract

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 capability of controlling light makes metasurface an attractive platform for infrared applications. Recently, different metamaterials have been proposed to achieve high thermal radiation. To date, broadening of the radiation bandwidth of 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 (Si3N4) – metal (Au) stacks. A high thermal radiation can be obtained by engineering the geometry of nanocavity metasurface. 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 8–14 μm. The experimental illustration together with theoretical framework places a basis for designing broadband thermal emitters, which, as anticipated, will initiate a promising avenue to M-IR source.

Dielectric metalens for miniaturized imaging systems: progress and challenges

“…The current advanced stacking and packaging technologies [213][214][215][216][217][218] offer access to integrating the lens wafer on the photosensor wafer. Hu et al 215 demonstrated fullcolor holography by stacking a metasurface upon a layer of color filter array (Fig.…”

Wide-Oblique-Incident-Angle Stable Polarization-Insensitive Ultra-Wideband Metamaterial Perfect Absorber for Visible Optical Wavelength Applications

“…Landy first introduced the metamaterial perfect absorber (MPA) [ 11 ], which has opened a new research area due to its extensive use in different applications such as energy harvesting [ 12 ], solar cells [ 13 ], photodetectors [ 14 ], and thermal emitters. [ 15 ]. Researchers are currently conducting extensive research on the MPA design for application in the infrared, THz, and microwave frequencies, and they are achieving low-loss devices through structural optimization [ 16 , 17 ].…”

Design and Parametric Analysis of a Wide-Angle and Polarization Insensitive Ultra-Broadband Metamaterial Absorber for Visible Optical Wavelength Applications

“…Since it may be used in a variety of applications, such as absorber [ 3 ], polarization converter [ 4 ], filter [ 5 ], imaging [ 6 ], antenna [ 7 ], invisible clock [ 8 ], sensor [ 9 ], waveguides [ 10 ], etc. The perfect metamaterial absorber was first developed by Landy [ 11 ], which started an innovative study area for its unique use in many applications, such as photo-detecting [ 12 ], energy harvesting [ 13 ], thermal emitter [ 14 ], and solar cell [ 15 ], etc. Researchers are now pursuing research on the metamaterial perfect absorber design for microwave frequency, visible, infrared, and THz applications and developing low-loss devices by structural optimization [ 16 ].…”