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

查看全文 作　　者：Norman Nan [1]Shi;Cheng-Chia [1]Tsai;Michael [1]J.Carter;Jyotirmoy [1]Mandal;Adam [1]C.Overvig;Matthew [2]Y.Sfeir;Ming [2]Lu;Catherine [3]L.Craig;Gary [4]D.Bernard;Yuan [1]Yang;Nanfang [1]Yu

机构地区：[1]Department of Applied Physics and Applied Mathematics,Columbia University,New York,NY 10027,USA;[2]Center for Functional Nanomaterials,Brookhaven National Laboratory,Upton,NY 11973,USA;[3]Museum of Comparative Zoology,Harvard University,Cambridge,MA 02138,USA;[4]Department of Electrical Engineering,University of Washington,Seattle,WA 98195,USA

出　　处：《Light(Science & Applications)》索引2018年第7卷第1期,共9页

基　　金：supported by the NSF(grant no.PHY-1411445);the Air Force Office of Scientific Research(grant nos.FA9550-14-1-0389 and FA9550-16-1-0322);supported by the US Department of Energy,Office of Basic Energy Sciences,under contract no.DE-SC0012704. 摘　　要：Broadband high reflectance in nature is often the result of randomly,three-dimensionally structured materials.This study explores unique optical properties associated with one-dimensional nanostructures discovered in silk cocoon fibers of the comet moth,Argema mittrei.The fibers are populated with a high density of air voids randomly distributed across the fiber cross-section but are invariant along the fiber.These 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 device.Drawing inspiration from these natural radiative-cooling fibers,biomimetic nanostructured fibers based on both regenerated silk fibroin and polyvinylidene difluoride are fabricated through wet spinning.Optical 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 0.91.The 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 localization.This 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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Nanostructured fibers as a versatile photonic platform: radiative cooling and waveguiding through transverse Anderson localization

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