From Event: SPIE Optical Engineering + Applications, 2017
The study shows that comet moth cocoon fibers exhibit radiative cooing properties with enhanced solar reflectivity and thermal emissivity. Nanostructured voids inside the cocoon fiber enables the cocoons to exhibit strong scattering in the visible and near-infrared. These structures also allow the fibers to exhibit strong shape birefringence and directional reflectivity. Optical waveguiding due to transverse Anderson localization is observed in these natural fibers, where the invariance and large concentration of the voids in the longitudinal direction allow the fiber to confine light in the transverse direction. To mimic the optical effects generated by these natural silk fibers, nanostructured voids are introduced into regenerated silk fibers through wet spinning to enhance reflectivity in the solar spectrum.
Norman Nan Shi, Cheng-Chia Tsai, Gary D. Bernard, Catherine Craig, and Nanfang Yu, "Nano-structured wild moth cocoon fibers as radiative cooling and waveguiding optical materials ," Proc. SPIE 10367, Light in Nature VI, 1036708 (Presented at SPIE Optical Engineering + Applications: August 07, 2017; Published: 6 September 2017); https://doi.org/10.1117/12.2273586.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon