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Silk Nanocrack Origami for Controllable Random Lasers

机译：可控随机激光器的丝纳米克拉克折纸

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摘要

The ancient art of Origami started to evolve as a contemporary technological method for the realization of morphologically induced and unconventional advanced functional structures. Here, directional random lasers (RLs) that are formed by folding (i.e., ori) dye-doped natural protein silk fibroin (SF) film as paper (i.e., kami) are demonstrated. The folding stress induces parallel nanocracks that simultaneously function as diffuse reflectors and laser light outcouplers at the boundaries of the optical gain medium. Random lasing is observed after a threshold energy level of 0.8 nJ mu m(-2) with an in-plane divergence-angle of 13 degrees. Moreover, the central laser emission wavelength is tuned from 588.7 to 602.1 nm by controlling the adjacent nanocracks distance and additional laser emission directions are introduced by further folding SF at different in-plane angles that induce rectangular and triangular geometries. More significantly, RL is fabricated via a quick, scalable, and environmentally friendly stress-induced nanocracking process maintaining its mechanical and optical properties even after 10,000 times of bending test. Hence, this study introduces a novel form of biocompatible, biodegradable, and large-area protein microlasers by using an unconventional laser fabrication approach.
机译：折纸的古代艺术开始发展成为实现形态学诱导和非常规的先进功能结构的现代技术方法。这里，通过折叠（即，ORI）染料掺杂天然蛋白质丝素丝素（SF）膜作为纸（即，kami）形成的定向随机激光器（RLS）。折叠应力诱导平行的纳米裂，同时起到漫反射器和光学增益介质边界的激光输出耦合器。在0.8 nJ mu m（-2）的阈值能级之后观察随机激光，其面内发散角为13度。此外，通过控制相邻的纳米裂纹距离588.7至602.1nm，通过控制诱导矩形和三角形几何形状的不同面内角度来引入附加激光发射方向的附加激光发射方向。更明显地，即使在弯曲试验的10,000次之后，通过快速，可扩展和环保的应力诱导的纳米裂化的纳米裂化过程制造RL。因此，本研究通过使用非传统激光制造方法介绍一种新型的生物相容性，可生物降解和大面积蛋白质微溶剂。

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