High-emissivity directional narrowband mid-infrared thermal emitter based on quasi-bound states in the continuum
Year: 2025
Type: article
Abstract: In order to improve the utilizing efficiency of thermal radiation, a large amount of research on thermal emitters has focused on improving the Q value and directionality. Here, to further improve the utilizing efficiency, What webelieve to be a new strategy for high-emissivity directional narrowband mid-infrared thermal emitters is introduced by combining Fabry-Pérot and symmetry-protected quasi-bound states in the continuum inside a dielectric metamaterial consisting of a top-layer Ge grating and a YbF 3 film on a metal substrate. The high directionality and high emissivity of the thermal emitters are achieved because radiation Q factor monotonically decreases with increasing angle, whereas dissipation Q factor is angle- independent. Experimental results demonstrate that the emitter exhibits thermal emission at the wavelength of 7.028 µm with high Q factor ( Q = 62.9) and high emissivity ( ɛ =0.89) at the angle of 15°, and low emissivity ( ɛ <0.4) outside the range of 6° to 24°. The proposed thermal emitter holds potential for practical applications in fields such as gas molecule detection and biosensing.
Source: Optics Express
DOI: 10.1364/oe.558040
Authors: Yan-Lin Liao, Heng Zhou, Yan Zhao
Institution: Anhui Medical University
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W4408504622