Infrared Polariscopy Imaging of Linear Polymeric Patterns with a Focal Plane Array
Reo Honda 1, Meguya Ryu 1, Masayuki Moritake 1, Armandas Balčytis 2, Vygantas Mizeikis 3, Jitraporn Vongsvivut 4
, Mark J. Tobin 4, Dominique Appadoo 5, Jing-Liang Li 6, Soon Hock Ng 2, Saulius Juodkazis 2,7,8,* and Junko Morikawa 1,*
, Mark J. Tobin 4, Dominique Appadoo 5, Jing-Liang Li 6, Soon Hock Ng 2, Saulius Juodkazis 2,7,8,* and Junko Morikawa 1,*
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
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-TextKeywords:
focal plane array; thermal source; synchrotron radiation; infrared spectroscopy; hyperspectral imaging; silk
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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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