All Dielectric LWIR Metasurface Reflectors for Space Technologies

Subwavelength periodic structures exhibit unique features that can be used in photonics applications, including cloaking, perfect absorption, perfect reflection, and negative refractive index. In our work, we study the reflectance spectra from periodic silicon pillar based dielectric metasurface in the wavelength range of 8-12 μm (LWIR) using finite element method. We demonstrate a narrow as well as broad bandwidth near unity reflection at wavelength of 9.6 and 10.6 μm, which is the primary emission lines of carbon dioxide laser. Our proposed design has potential application in sensor protection which can be applied in space technologies, aerospace and defense.