Broadband pyramid antireflective structure on chalcogenide glasses by the hot embossing method for infrared photonics

Pyramidal antireflective structures were produced by hot embossing single- and double-sides of an amorphous GcSe(4) optical element. The optical performances were measured across the wavelength range from 2 mu m to 15 mu m. The transmittance at normal incident angle was increased up to 75.6% and 79.8% for single and double-side embossing respectively. The experimental results were in close agreement with simulation performed using the rigorous coupled-wave analysis (RCWA). Theoretical models also predicted well the transmittance changes as a function of incident angle from 0 degrees to 50 degrees at a fixed laser wavelength of 5.1 mu m. A Fabry-Perot interferometer consisting of two single surface embossed samples is proposed. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

Pyramidal antireflective structures were fabricated by hot embossing of an amorphous GcSe(4) optical element on both single- and double-sides. The transmittance was significantly improved, reaching up to 75.6% and 79.8% for single and double-side embossing, respectively. Experimental results showed good agreement with simulation using rigorous coupled-wave analysis (RCWA), and theoretical models successfully predicted the transmittance changes with incident angle. A new Fabry-Perot interferometer structure composed of two single surface embossed samples was proposed.