Benlyas Rihab, Shimizu Makoto, Otomo Keiya, Liu Zhen, Yugami Hiroo
Opt Express. 2022 Mar 14;30(6):9380-9388. doi: 10.1364/OE.450802.
Thermal radiation management remains a challenge because of the incoherent and isotropic nature of electromagnetic waves. In this study, a multiband and angular-selective infrared emitter, consisting of a simple one-dimensional (1D) metal-dielectric-metal metamaterial, is demonstrated. Although this structure has been well known as spectrally selective emitters, we analytically reveal that when the dielectric layer thickness is much smaller than the wavelength of interest (< 1/10), directive emission at nearly equal to the grazing angles (> 80°) can be obtained at multiple resonant wavelengths. As the absorption peaks can be entirely characterized by geometrical parameters, this angular selective technology offers flexible control of thermal radiation and can be adjusted to specific applications.
由于电磁波的非相干和各向同性特性，热辐射管理仍然是一个挑战。在本研究中，展示了一种由简单的一维（1D）金属-电介质-金属超材料组成的多波段和角度选择性红外发射器。尽管这种结构作为光谱选择性发射器已广为人知，但我们通过分析揭示，当电介质层厚度远小于感兴趣的波长（<1/10）时，在多个共振波长处可获得几乎等于掠射角（>80°）的定向发射。由于吸收峰可以完全由几何参数表征，这种角度选择性技术提供了对热辐射的灵活控制，并且可以针对特定应用进行调整。
