Open AccessInclined surfaces in diamond: broadband antireflective structures and coupling light through waveguides
Author(s) -
Pontus Forsberg,
Mikael Karlsson
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.002693
Subject(s) - anti reflective coating , optics , materials science , diamond , broadband , etching (microfabrication) , coupling (piping) , wavelength , polishing , plasma etching , optoelectronics , nanotechnology , physics , layer (electronics) , metallurgy , composite material
Control of the sidewall angle of diamond microstructures was achieved by varying the gas mixture, bias power and mask shape during inductively coupled plasma etching. Different etch mechanisms were responsible for the angle of the lower and upper part of the sidewall formed during diamond etching. These angles could to some extent be controlled separately. The developed etch process was used to fabricate wideband antireflective structures with an average transmission of 96.4% for wavelengths between 10 and 50 µm. Smooth facetted edges for coupling light through waveguides from above were also demonstrated.