Open AccessSingle‐layer narrow‐band beam splitter based on a transparent grating with high‐spectral contrast and high‐angle sensitivity
Author(s) -
Zhang Jian,
Zhang Xinping
Publication year - 2017
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2017.0082
Subject(s) - materials science , optics , grating , indium tin oxide , guided mode resonance , beam splitter , optoelectronics , diffraction grating , waveguide , layer (electronics) , beam (structure) , laser , physics , composite material
A report on the polarisation beam splitter with high‐angle‐resolved tunability in the visible spectrum, which was achieved in a single layer of transparent thin film of indium‐tin‐oxide (ITO). One‐dimensional grating structures were etched into an ITO layer with a designed depth using inductively coupled plasma, where the remaining ITO acts as a waveguide. Enhanced reflection of light was observed when the retro‐diffraction was overlapped with the waveguide resonance mode. A beam splitting ratio of 1:1 was achieved at 532 nm at a specific incident angle. This is a stable and efficient beam splitter with high contrast and narrow‐band response. It can also be applied as tunable narrow‐band filters, angle sensors or optical switch.