Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Anisotropy of 3D Columnar Coatings in Mid-Infrared Spectral Range

Version 1 : Received: 18 October 2021 / Approved: 19 October 2021 / Online: 19 October 2021 (14:11:15 CEST)

A peer-reviewed article of this Preprint also exists.

Grineviciute, L.; Ng, S.H.; Han, M.; Moein, T.; Anand, V.; Katkus, T.; Ryu, M.; Morikawa, J.; Tobin, M.J.; Vongsvivut, J.; Tolenis, T.; Juodkazis, S. Anisotropy of 3D Columnar Coatings in Mid-Infrared Spectral Range. Nanomaterials 2021, 11, 3247. Grineviciute, L.; Ng, S.H.; Han, M.; Moein, T.; Anand, V.; Katkus, T.; Ryu, M.; Morikawa, J.; Tobin, M.J.; Vongsvivut, J.; Tolenis, T.; Juodkazis, S. Anisotropy of 3D Columnar Coatings in Mid-Infrared Spectral Range. Nanomaterials 2021, 11, 3247.

Journal reference: Nanomaterials 2021, 11, 3247
DOI: 10.3390/nano11123247

Abstract

Polarisation analysis in the mid-infrared fingerprint region was carried out on thin (∼1μm) Si and SiO2 films evaporated via glancing angle deposition (GLAD) method at 70∘ to the normal. Synchrotron-based infrared microspectroscopic measurements were carried out on the Infrared Microspectroscopy (IRM) beamline at Australian Synchrotron. Specific absorption bands, particularly Si-O-Si stretching vibration, was found to follow the angular dependence of ∼cos2θ, consistent with the absorption anisotropy. This unexpected anisotropy stems from the enhanced absorption in nano-crevices, which have orientation following the cos2θ angular dependence as revealed by Fourier transforming the image of the surface of 3D columnar films and numerical modeling of light field enhancement by sub-wavelength nano-crevices.

Keywords

Polarisation; IR; fingerprint region; birefringence; dichroism; sculptured thin films; anisotropy

Subject

MATERIALS SCIENCE, Nanotechnology

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.