Structural Protein-based Flexible Whispering Gallery Mode Resonators

TL;DR

This paper introduces flexible, biodegradable whispering-gallery-mode resonators made from structural proteins, demonstrating their potential for energy-efficient, biocompatible photonic devices with superior optical switching performance.

Contribution

The study presents the first fabrication of protein-based WGM microresonators with unconventional thermo-optic response and high flexibility, advancing bio-inspired photonic device technology.

Findings

Demonstrated waveguides, add-drop filters, and flexible resonators from protein materials.

Achieved optical switching efficiency over a thousand times greater than silica WGM resonators.

Showcased energy-efficient, biocompatible, and biodegradable photonic devices.

Abstract

Nature provides a set of solutions for photonic structures that are finely tuned, organically diverse and optically efficient. Exquisite knowledge of structure-property relationships in proteins aids in the design of materials with desired properties for building devices with novel functionalities, which are difficult to achieve or previously unattainable. Recent bio-inspired photonic platforms made from proteinaceous materials lay the groundwork for many functional device applications, such as electroluminescence in peptide nucleic acids, multiphoton absorption in amyloid fibers and silk waveguides and inverse opals. Here we report whispering-gallery-mode (WGM) microresonators fabricated entirely from semi-crystalline structural proteins (i.e., squid ring teeth, SRT, from Loligo vulgaris and its recombinant) with unconventional thermo-optic response. We demonstrated waveguides, add-drop filters and flexible resonators as first examples of energy-efficient, highly flexible, biocompatible and biodegradable protein-based photonic devices. Optical switching efficiency in these devices is over thousand times greater than the values reported for Silica WGM resonators. This work opens the way for designing energy efficient functional photonic devices using structure- property relationships of proteins.