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Infrared Polariscopy Imaging of Linear Polymeric Patterns with a Focal Plane Array

1
Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
2
Swinburne University of Technology, John Street, Hawthorn, Victoria 3122, Australia
3
Research Institute of Electronics, Shizuoka University, Naka-ku, 3-5-3-1 Johoku, Hamamatsu, Shizuoka 4328561, Japan
4
Infrared Microspectroscopy Beamline, Australian Synchrotron, Clayton, Victoria 3168, Australia
5
THz-Far Infrared Beamline, Australian Synchrotron, Clayton, Victoria 3168, Australia
6
Institute for Frontier Materials, Deakin University, Geelong, Victoria 3220, Australia
7
Tokyo Tech World Research Hub Initiative (WRHI), School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo 152-8550, Japan
8
Melbourne Center for Nanofabrication, Australian National Fabrication Facility, Clayton, Victoria 3168, Australia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(5), 732; https://doi.org/10.3390/nano9050732
Received: 21 April 2019 / Revised: 4 May 2019 / Accepted: 4 May 2019 / Published: 13 May 2019
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Abstract

Polariscopy is demonstrated using hyperspectral imaging with a focal plane array (FPA) detector in the infrared (IR) spectral region under illumination by thermal and synchrotron light sources. FPA Fourier-transform IR (FTIR) imaging microspectroscopy is useful for monitoring real time changes at specific absorption bands when combined with a high brightness synchrotron source. In this study, several types of samples with unique structural motifs were selected and used for assessing the capability of polariscopy under this FPA-FTIR imaging technique. It was shown that the time required for polariscopy at IR wavelengths can be substantially reduced by the FPA-FTIR imaging approach. By using natural and laser fabricated polymers with sub-wavelength features, alignment of absorbing molecular dipoles and higher order patterns (laser fabricated structures) were revealed. Spectral polariscopy at the absorption peaks can reveal the orientation of sub-wavelength patterns (even when they are not spatially resolved) or the orientation of the absorbing dipoles. View Full-Text
Keywords: focal plane array; thermal source; synchrotron radiation; infrared spectroscopy; hyperspectral imaging; silk focal plane array; thermal source; synchrotron radiation; infrared spectroscopy; hyperspectral imaging; silk
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Honda, R.; Ryu, M.; Moritake, M.; Balčytis, A.; Mizeikis, V.; Vongsvivut, J.; Tobin, M.J.; Appadoo, D.; Li, J.-L.; Ng, S.H.; Juodkazis, S.; Morikawa, J. Infrared Polariscopy Imaging of Linear Polymeric Patterns with a Focal Plane Array. Nanomaterials 2019, 9, 732.

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