Broadband anti-reflection coating for sub-terahertz optics using dielectric multilayers
Abstract
Sub-terahertz astronomy requires instruments capable of simultaneous observations across multiple spectral bands, motivating the development of broadband anti-reflection coatings (ARCs). We investigated low-loss dielectrics with refractive indices suitable for multilayer ARCs on polyethylene optical elements and identified candidates that partially meet the requirements. To address the remaining gaps in available refractive indices, we applied dielectric multilayer synthesis by combining newly identified thin materials with controlled bonding to realize the required effective refractive indices. As a result, the fabricated five-layer ARC achieved reflection losses of 0.2% (average) and 3.2% (maximum) over 130-710 GHz.
Fields of Study & Subjects
Terahertz technology and applications
Optical Coatings and Gratings
Superconducting and THz Device Technology
Publication details
- Journal / source
- Applied Optics
- Publisher
- Optica Publishing Group
- Volume
- 65
- Issue
- 8
- Pages
- 2468–2468
- Publication date
- 10 February 2026
- Language
- EN