An All‐Optically Controlled Liquid‐Crystal Plasmonic Metasurface Platform,Laser & Photonics Reviews

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An All‐Optically Controlled Liquid‐Crystal Plasmonic Metasurface Platform
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2020-09-23 , DOI: 10.1002/lpor.202000253
Mukesh Sharma _{1,

2} , Tal Ellenbogen _{1,

2}

Affiliation

The need for thin active metasurface based elements, opens an exciting research direction toward exploration of various active materials and their control mechanisms. Here, an all‐optical control mechanism of composite metasurfaces is studied, based on rapid laser‐induced thermo‐optical nonlinearities in nematic liquid crystals (NLCs). Specifically, the absorption of photons leads to local heating, which in turn facilitates a nematic‐to‐isotropic (N–I) phase transition of a twisted‐NLC (TNLC) layer that is sandwiched between an indium tin oxide (ITO) coated glass plate and the metasurface. This mechanism is used to experimentally demonstrate all‐optically switchable plasmonic metasurface color tag. The dependence of the switching on the laser power and the dynamic response of the device are characterized. Experimental results show that the pump beam power significantly affects the switching time, which can be further reduced by thermal management of the design. Such switching mechanisms have great potential in all‐optically controlled systems and can be applied to realize additional active and multifunctional optical devices at nanoscale.

中文翻译：

全光控液晶等离子超表面平台

对薄的，基于超表面的活性元素的需求，为探索各种活性材料及其控制机制开辟了令人兴奋的研究方向。在此，基于向列液晶（NLC）中激光引起的快速热光学非线性，研究了复合超表面的全光控制机制。具体来说，光子的吸收会导致局部加热，进而促进向列向各向同性（N –I）夹在涂有铟锡氧化物（ITO）的玻璃板和超表面之间的扭曲NLC（TNLC）层的相变。该机制用于通过实验证明全光可转换的等离子超表面颜色标签。表征了开关对激光功率的依赖性以及设备的动态响应。实验结果表明，泵浦光束功率显着影响开关时间，可通过设计的热管理进一步降低开关时间。这样的切换机制在全光控制系统中具有巨大的潜力，可用于实现纳米级的其他有源和多功能光学设备。

更新日期：2020-11-12

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