Anisotropic 3D columnar micro-film coating for applications in infrared and visible spectral ranges
Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier B.V.
Abstract
Polarisation analysis of thin (∼1 μm) SiO2 films deposited via evaporation at a glancing angle of 70◦ to the
normal on resist pillar arrays was carried out using synchrotron-based Fourier transform infrared (s-FTIR)
microspectroscopy in reflection mode. Changes in intensity of absorption bands were observed to follow
the angular dependence of ∼ cos2 𝜃, consistent with the absorption anisotropy. The strongest absorption was
found to be the sharp Si–O–Si stretching vibrational mode at 1040 ± 20 cm−1, which can be used for sensor
applications, as well as radiative cooling in the atmospheric transparency window, within the range of 8-13 μm
(i.e. 1250-769 cm−1). Anisotropy of IR absorbance is correlated with retardance/birefringence of the same
patterns in the visible spectral range. Larger period patterns of 3D columnar SiO2 films of ∼1 μm in thickness
deposited on polymer/resist pillar arrays provide the possibility to control anisotropy of the form-birefringent
3D columnar films.
Description
Keywords
IR Fingerprint region, Atmospheric transparency window, Birefringence, Dichroism, Sculptured thin films