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Nanostructured fibers as a versatile photonic platform: radiative cooling and waveguiding through transverse Anderson localization

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Light(Science & Applications) 2018年第1期7卷 690-698页

作者： Norman Nan Shi Cheng-Chia Tsai Michael J.Carter jyotirmoy mandal Adam C.Overvig Matthew Y.Sfeir Ming Lu Catherine L.Craig Gary D.Bernard Yuan Yang Nanfang Yu Department of Applied Physics and Applied Mathematics Columbia UniversityNew YorkNY 10027USA Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNY 11973USA Museum of Comparative Zoology Harvard UniversityCambridgeMA 02138USA Department of Electrical Engineering University of WashingtonSeattleWA 98195USA

Broadband high reflectance in nature is often the result of randomly,three-dimensionally structured *** study explores unique optical properties associated with one-dimensional nanostructures discovered in silk cocoon fibers of the comet moth,Argema *** fibers are populated with a high density of air voids randomly distributed across the fiber cross-section but are invariant along the *** filamentary air voids strongly scatter light in the solar spectrum.A single silk fiber measuring~50μm thick can reflect 66%of incoming solar radiation,and this,together with the fibers’high emissivity of 0.88 in the mid-infrared range,allows the cocoon to act as an efficient radiative-cooling *** inspiration from these natural radiative-cooling fibers,biomimetic nanostructured fibers based on both regenerated silk fibroin and polyvinylidene difluoride are fabricated through wet *** characterization shows that these fibers exhibit exceptional optical properties for radiative-cooling applications:nanostructured regenerated silk fibers provide a solar reflectivity of 0.73 and a thermal emissivity of 0.90,and nanostructured polyvinylidene difluoride fibers provide a solar reflectivity of 0.93 and a thermal emissivity of *** filamentary air voids lead to highly directional scattering,giving the fibers a highly reflective sheen,but more interestingly,they enable guided optical modes to propagate along the fibers through transverse Anderson *** discovery opens up the possibility of using wild silkmoth fibers as a biocompatible and bioresorbable material for optical signal and image transport.

关键词： fibers radiative transverse

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