Fabrication of three-layer silicon antireflection structures in 200-450 GHz using deep reactive ion etching

We developed broadband antireflection structures for millimeter-wave and submillimeter-wave applications, particularly cryogenic applications. The structures were fabricated on silicon using deep reactive ion etching. Three-layer subwavelength structures were fabricated on both sides of a silicon plate with an area of 20 mm(2). The transmittances of the structures were measured at 28 K. The average transmittance was 97.6% in the frequency range of 200-450 GHz. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement