Journal
COATINGS
Volume 12, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/coatings12101571
Keywords
boron nitride; polarisation; optical anisotropy
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom [EP/N035569/1]
- EPSRC Centre for Doctoral Training in Electromagnetic Metamaterials [EP/L015331/1]
- Russian Science Foundation [21-12-00304]
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Unusual optical anisotropy was observed in hexagonal boron nitride thin films produced via ultrasonication. Statistical analysis revealed an ordered particle density distribution corresponding to the observed optical axis.
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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