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Proceedings Paper

Sub-wavelength gratings for mid-infrared wavlength range around 10 microns
Author(s): Brian Hogan; Stephen P. Hegarty; Liam Lewis; Javier Romero Vivas; Tomasz Ochalski; Guillaume Huyet
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Paper Abstract

A new material pairing is presented for the realisation of sub-wavelength graings in this work and has been used to realise high contrast gratings which operate at wavelengths of 10 μm and greater. The chosen material pairing overcomes the absorption issue which prevents the popular Si/SiO2 pairing from being useful at wavelengths above 6 μm. The obstacles that exist with the currently used grating materials for this wavelength range are described and it is outlined how the chosen materials overcome these issues. It is numerically demonstrated that gratings utilising these materials are capable of wideband high reflectivity. The gratings were fabricated using standard optical photolithography only and it is shown experimentally that the spectral response of gratings which were fabricated show good agreement with theoretically predicted performance

Paper Details

Date Published: 20 February 2017
PDF: 8 pages
Proc. SPIE 10113, High Contrast Metastructures VI, 101130D (20 February 2017); doi: 10.1117/12.2251937
Show Author Affiliations
Brian Hogan, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)
Stephen P. Hegarty, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)
Liam Lewis, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)
Javier Romero Vivas, Cork Institute of Technology (Ireland)
Tomasz Ochalski, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)
Guillaume Huyet, Cork Institute of Technology (Ireland)
Tyndall National Institute (Ireland)
ITMO Univ. (Russian Federation)


Published in SPIE Proceedings Vol. 10113:
High Contrast Metastructures VI
Connie J. Chang-Hasnain; Andrei Faraon; Fumio Koyama; Weimin Zhou, Editor(s)

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