University of Oulu

Kotova, L. V., Altynbaev, L. A., Zhukova, M. O., Borodin, B. R., Kochereshko, V. P., Baldycheva, A., & Hogan, B. T. (2022). Boron Nitride Thin Films with Anisotropic Optical Properties from Microscale Particle Density Distributions. Coatings, 12(10), 1571.

Boron nitride thin films with anisotropic optical properties from microscale particle density distributions

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Author: Kotova, Lyubov V.1,2; Altynbaev, Linar A.1; Zhukova, Maria O.2;
Organizations: 1Ioffe Institute, 194021 St. Petersburg, Russia
2Faculty of Photonics, ITMO University, 197101 St. Petersburg, Russia
3Department of Engineering, University of Exeter, Exeter EX4 4QF, UK
4Department of Electrical and Information Engineering, University of Oulu, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.4 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2023-05-30


Unusual optical anisotropy was experimentally observed in hexagonal boron nitride thin films produced from bulk boron nitride via ultrasonication. Both the linear and circular polarisation demonstrated a well-defined single axis of anisotropy over a large sample area. To understand this phenomenon, we employed statistical analysis of optical microscopy images and atomic force microscopy to reveal an ordered particle density distribution at the microscopic level corresponding to the optical axis observed in the polarisation data. The direction of the observed ordering matched the axis of anisotropy. Hence, we attribute the measured optical anisotropy of the thin films to microscopic variations in the particle density distribution.

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Series: Coatings
ISSN: 2079-6412
ISSN-E: 2079-6412
ISSN-L: 2079-6412
Volume: 12
Issue: 10
Article number: 1571
DOI: 10.3390/coatings12101571
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This research was funded by: Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom (Grant No. EP/N035569/1); EPSRC Centre for Doctoral Training in Electromagnetic Metamaterials (Grant No. EP/L015331/1); Russian Science Foundation (project No. 21-12-00304).
Copyright information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (