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首页> 外文期刊>RSC Advances >Reconfigurable photonic crystals with optical bistability enabled by “cold” programming and thermo-recoverable shape memory polymers
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Reconfigurable photonic crystals with optical bistability enabled by “cold” programming and thermo-recoverable shape memory polymers

机译：通过“冷”编程和热可恢复形状记忆聚合物实现具有光学双稳性的可重配置光子晶体

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Recently, reconfigurable photonic crystals that can reversibly change and recover their optical properties (e.g. photonic stopbands) in response to external stimuli have aroused much attention. However, developing a photonic crystal with a dynamically tunable nanostructure that can memorize and maintain different nanostructures and related optical properties is still a challenge. Based on capillary pressure-induced “cold” programming and heat-triggered recoverable shape memory polymers, reconfigurable 3D photonic crystal membranes with optical bistability, which show two reversibly tunable stable equilibrium states, are reported in this work. During shape memory programming and recovery processes, capillary pressure created by water evaporation induces “cold” programming of photonic crystal membranes with a disordered temporary state without diffractive peaks at room temperature. The permanent ordered photonic crystal nanostructures with apparent characteristic diffraction peaks can be recovered by heating. The reversible transition of photonic crystals between an ordered permanent state and a disordered temporary state during the cyclical programming and recovery results in a tremendous change in appearance and a large and stable shift of diffraction peaks different from conventionally tunable photonic crystals. This disorder-to-order transition and the tremendous shift of photonic bandgaps enable the photonic crystals to serve as a sensitive optical tool to the probe shape memory effect at the nanoscale. Importantly, a large difference in optical transmittances is shown as no stopband exists in the disordered temporary state, which provides a unique alternative in developing photonic crystal photoswitches with higher contrast and optical switching effect, as well as rewritable photonic devices and displays etc.
机译：近来，可响应外部刺激而可逆地改变和恢复其光学特性的可重构光子晶体（例如光子阻带）引起了人们的广泛关注。然而，开发具有可动态记忆的纳米结构的光子晶体可以记忆并维持不同的纳米结构和相关的光学性质仍然是一个挑战。基于毛细管压力诱导的“冷”编程和热触发的可恢复形状记忆聚合物，在这项工作中报道了具有光学双稳性的可重构3D光子晶体膜，其显示出两个可逆可调的稳定平衡状态。在形状记忆编程和恢复过程中，由水蒸发产生的毛细压力会引起光子晶体膜的“冷”编程，该光子晶体膜具有无序的临时状态，在室温下没有衍射峰。具有明显特征衍射峰的永久有序光子晶体纳米结构可以通过加热来回收。与常规可调光子晶体不同，在周期性编程和恢复期间，光子晶体在有序的永久状态和无序的临时状态之间可逆转换会导致外观发生巨大变化，并且衍射峰出现大而稳定的偏移。这种从无序到有序的跃迁以及光子带隙的巨大变化，使光子晶体可以作为敏感的光学工具，对纳米级的探针形状记忆效应产生影响。重要的是，由于在无序的临时状态下不存在阻带，因此显示出较大的光学透射率差异，这为开发具有更高对比度和光学开关效果的光子晶体光电开关以及可重写光子器件和显示器等提供了独特的选择。 。

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