Εξειδίκευση τύπου :	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Photo-elasticity of silk fibroin harnessing whispering gallery modes
Δημιουργός/Συγγραφέας:	Korakas, Nikolaos Vurro, Davide [EL] Τσιλιπάκος Οδυσσέας[EN] Tsilipakos, Odysseas Vasileiadis, Thomas Graczykowski, Bartlomiej Cucinotta, Annamaria Selleri, Stefano Fytas, George Iannotta, Salvatore Pissadakis, Stavros
Ημερομηνία:	2023-06-16
Γλώσσα:	Αγγλικά
ISSN:	2045-2322
DOI:	10.1038/s41598-023-36400-0
Άλλο:	37328482
Περίληψη:	Silk fibroin is an important biomaterial for photonic devices in wearable systems. The functionality of such devices is inherently influenced by the stimulation from elastic deformations, which are mutually coupled through photo-elasticity. Here, we investigate the photo-elasticity of silk fibroin employing optical whispering gallery mode resonation of light at the wavelength of 1550 nm. The fabricated amorphous (Silk I) and thermally-annealed semi-crystalline structure (Silk II) silk fibroin thin film cavities display typical Q-factors of about 1.6 × 104. Photo-elastic experiments are performed tracing the TE and TM shifts of the whispering gallery mode resonances upon application of an axial strain. The strain optical coefficient K' for Silk I fibroin is found to be 0.059 ± 0.004, with the corresponding value for Silk II being 0.129 ± 0.004. Remarkably, the elastic Young's modulus, measured by Brillouin light spectroscopy, is only about 4% higher in the Silk II phase. However, differences between the two structures are pronounced regarding the photo-elastic properties due to the onset of β-sheets that dominates the Silk II structure.
Τίτλος πηγής δημοσίευσης:	Scientific reports
Τόμος/Κεφάλαιο:	13
Τεύχος:	1
Θεματική Κατηγορία:	[EL] Φασματοσκοπία[EN] Spectroscopy [EL] Εφαρμοσμένη οπτική. Φωτονική[EN] Applied optics. Photonics [EL] Φυσική και θεωρητική χημεία[EN] Physical and theoretical chemistry
Λέξεις-Κλειδιά:	Optical biomaterials Photoelasticity Silk fibroin Whispering Gallery Mode (WGM)
EU Grant:	ESPA 2014-2020 ACTPHAST 4.0 PHAETHON
EU Grant identifier:	779472 TAEDK-6170
Κάτοχος πνευματικών δικαιωμάτων:	© 2023 The Authors
Όροι και προϋποθέσεις δικαιωμάτων:	This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
Ηλεκτρονική διεύθυνση στον εκδότη (link):	https://www.nature.com/articles/s41598-023-36400-0#Abs1
Σημειώσεις:	NK and SP would like to thank Ms E. Kapsetaki (IMBB-FORTH) for centrifuging the silk solutions, Dr Vasilis Papadakis for obtaining the micro-Raman measurements, as well as, Ms A. Manousaki for the SEM pictures. In particular, SP and NK would like to acknowledge Pasquale Dangelo (IMEM Parma) for preparing the last batch of silk fibroin samples. Nikolaos Korakas acknowledges the financial support of State Scholarship Foundation (IKY) within the framework of ESPA 2014-2020. Stavros Pissadakis acknowledges partial support from the EU project by ACTPHAST 4.0 under Grant agreement 779472, and co‐finance by the European Union NextGenerationEU under the call RESEARCH—CREATE—INNOVATE 16971 Recovery and Resilience Facility (Project PHAETHON, code: TAEDK-6170).
Εμφανίζεται στις συλλογές:	Ινστιτούτο Θεωρητικής και Φυσικής Χημείας (ΙΘΦΧ) - Επιστημονικό έργο