Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range
School of Science, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, VIC 3122, Australia
Department of Laser Technologies, Center for Physical Sciences and Technology, Savanoriu Ave. 231, LT-02300 Vilnius, Lithuania
Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan
Australian Future Fibres Research and Innovation Centre, Institute for Frontier Materials, Deakin University, Geelong, VIC 3220, Australia
Australian Synchrotron, Blackburn Road, Clayton, VIC 3168, Australia
Melbourne Centre for Nanofabrication, the Victorian Node of the Australian National Fabrication Facility, 151 Wellington Rd., Clayton, VIC 3168, Australia
These authors contributed equally to this work.
Current address: Ruhr-University Bochum, 44801 Bochum, Germany.
Current address: Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
Authors to whom correspondence should be addressed.
Academic Editor: Armando J. D. Silvestre
Received: 30 January 2017 / Revised: 2 March 2017 / Accepted: 23 March 2017 / Published: 28 March 2017
Domestic (Bombyx mori
) and wild (Antheraea pernyi
) silk fibers were characterised over a wide spectral range from THz 8 cm
0.24 THz) to deep-UV
1500 THz) wavelengths or over a 12.6 octave frequency range. Spectral features at
-coil and amorphous fibroin were analysed at different spectral ranges. Single fiber cross sections at mid-IR were used to determine spatial distribution of different silk constituents and revealed an
-coil rich core and more broadly spread
-sheets in natural silk fibers obtained from wild Antheraea pernyi
moths. Low energy T-ray bands at 243 and 229 cm
were observed in crystalline fibers of domestic and wild silk fibers, respectively, and showed no spectral shift down to 78 K temperature. A distinct
band was observed in the crystalline Antheraea pernyi
silk fibers. Systematic analysis and assignment of the observed spectral bands is presented. Water solubility and biodegradability of silk, required for bio-medical and sensor applications, are directly inferred from specific spectral bands.
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Balčytis, A.; Ryu, M.; Wang, X.; Novelli, F.; Seniutinas, G.; Du, S.; Wang, X.; Li, J.; Davis, J.; Appadoo, D.; Morikawa, J.; Juodkazis, S. Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range. Materials 2017, 10, 356.
Balčytis A, Ryu M, Wang X, Novelli F, Seniutinas G, Du S, Wang X, Li J, Davis J, Appadoo D, Morikawa J, Juodkazis S. Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range. Materials. 2017; 10(4):356.
Balčytis, Armandas; Ryu, Meguya; Wang, Xuewen; Novelli, Fabio; Seniutinas, Gediminas; Du, Shan; Wang, Xungai; Li, Jingliang; Davis, Jeffrey; Appadoo, Dominique; Morikawa, Junko; Juodkazis, Saulius. 2017. "Silk: Optical Properties over 12.6 Octaves THz-IR-Visible-UV Range." Materials 10, no. 4: 356.
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