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Open AccessArticle

The Investigation of the Waveguiding Properties of Silk Fibroin from the Visible to Near-Infrared Spectrum

1
Department of Microelectronics, Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 168 27 Prague, Czech Republic
2
Department of Energy Systems Research, Ajou University, Suwon 16499, Korea
3
Department of Physics, Ajou University, Suwon 16499, Korea
4
Department of Inorganic Chemistry, Faculty of Chemical Technology, Institute of Chemical Technology, Technicka 5, 166 28 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Materials 2018, 11(1), 112; https://doi.org/10.3390/ma11010112
Received: 27 November 2017 / Revised: 2 January 2018 / Accepted: 5 January 2018 / Published: 11 January 2018
(This article belongs to the Section Biomaterials)
Silk fibroin protein has been reinvented as a new optical material for biophotonic applications because of its optical transparency, biocompatibility, and easy fabrication process. It is used in various silk-based optical devices, which makes it desirable to investigate the optical properties of silk from diverse perspectives. This paper presents our investigation of the optical properties of silk fibroin, extracted from Bombyx mori cocoons. We have measured transmission spectra from the visible to near-infrared region and investigated waveguiding properties by the prism-coupling technique for five wavelengths (473.0, 632.8, 964.0, 1311, and 1552 nm). From the measurements, we determined the values of refractive indices. The measurements also proved waveguiding properties for all of the wavelengths. Optical scattering losses were measured by the fiber probe technique at 632.8 nm and were estimated to be 0.22 dB·cm−1. View Full-Text
Keywords: silk fibroin; optical planar waveguides; optical losses silk fibroin; optical planar waveguides; optical losses
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Prajzler, V.; Min, K.; Kim, S.; Nekvindova, P. The Investigation of the Waveguiding Properties of Silk Fibroin from the Visible to Near-Infrared Spectrum. Materials 2018, 11, 112.

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