Anderson Light Localization in Biological Nanostructures of Native Silk

Overview

Journal Nat Commun

Specialty Biology

Date 2018 Feb 2

PMID 29386508

Citations 21

Authors

Seung Ho Choi

Seong-Wan Kim

Zahyun Ku

Michelle A Visbal-Onufrak

Seong-Ryul Kim

Kwang-Ho Choi

Hakseok Ko

Wonshik Choi

Augustine M Urbas

Tae-Won Goo

Young L Kim

Affiliations

Soon will be listed here.

Abstract

Light in biological media is known as freely diffusing because interference is negligible. Here, we show Anderson light localization in quasi-two-dimensional protein nanostructures produced by silkworms (Bombyx mori). For transmission channels in native silk, the light flux is governed by a few localized modes. Relative spatial fluctuations in transmission quantities are proximal to the Anderson regime. The sizes of passive cavities (smaller than a single fibre) and the statistics of modes (decomposed from excitation at the gain-loss equilibrium) differentiate silk from other diffusive structures sharing microscopic morphological similarity. Because the strong reflectivity from Anderson localization is combined with the high emissivity of the biomolecules in infra-red radiation, silk radiates heat more than it absorbs for passive cooling. This collective evidence explains how a silkworm designs a nanoarchitectured optical window of resonant tunnelling in the physically closed structures, while suppressing most of transmission in the visible spectrum and emitting thermal radiation.

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