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Spatially Controlled All-Optical Switching of Liquid-Crystal-Empowered Metasurfaces
ACS Photonics ( IF 6.5 ) Pub Date : 2025-01-21 , DOI: 10.1021/acsphotonics.4c02029
Maximilian Beddoe, Sarah L. Walden, Slobodan Miljevic, Dmitry Pidgayko, Chengjun Zou, Alexander E. Minovich, Angela Barreda, Thomas Pertsch, Isabelle Staude
ACS Photonics ( IF 6.5 ) Pub Date : 2025-01-21 , DOI: 10.1021/acsphotonics.4c02029
Maximilian Beddoe, Sarah L. Walden, Slobodan Miljevic, Dmitry Pidgayko, Chengjun Zou, Alexander E. Minovich, Angela Barreda, Thomas Pertsch, Isabelle Staude
Embedding metasurfaces in liquid crystal (LC) cells is a promising technique for realizing tunable optical functionalities. Here, we demonstrate spatially controlled all-optical switching of the optical response of a homogeneous silicon nanocylinder metasurface featuring various Mie-type resonances in the spectral range between 670 and 720 nm integrated in a nematic LC cell. The initial alignment of the LC molecules is controlled by photoalignment layers, where the alignment direction is defined by homogeneous exposure with linearly polarized light at a 450 nm wavelength. Exposure of the photoalignment layer with the same light, whose polarization is rotated by 90°, induces a local change in the direction of the LC alignment and modulates the optical response of the metasurface. The resulting spatially dependent optical properties of the metasurface system are characterized by hyperspectral imaging. The described technique allows the nonvolatile creation of complex spatio-spectral response functions with a spatial resolution of 20 μm. Moreover, we demonstrate that the response of the LC-integrated metasurface can be switched multiple times by subsequent exposures with alternating orthogonal polarizations. Finally, we show that the images can be temporarily erased by heating the sample above the critical LC transition temperature, where the LC transitions to its isotropic phase. The demonstrated approach represents the controlling-light-by-light concept, an alternative to electro-optical or electromechanical control methods, which require complicated electronic architectures for spatially resolved modulation. Our results hold significant potential for applications such as next-generation displays or spatial light modulators that require spatial control of a tunable, tailored optical response.
中文翻译:
液晶赋能超表面的空间控制全光切换
将超表面嵌入液晶 (LC) 单元是实现可调谐光学功能的一种很有前途的技术。在这里,我们展示了均质硅纳米圆柱形超表面的空间控制全光切换,该超表面在 670 至 720 nm 的光谱范围内具有各种 Mie 型共振,集成在向列 LC 单元中。液相色谱分子的初始对准由光对准层控制,其中对准方向由 450 nm 波长的线偏振光均匀曝光定义。用相同的光曝光光取向层,其偏振旋转 90°,导致 LC 取向的局部变化并调制超表面的光学响应。通过高光谱成像来表征超表面系统的空间依赖性光学特性。所描述的技术允许以非易失性方式创建空间分辨率为 20 μm 的复杂空间光谱响应函数。此外,我们证明 LC 集成超表面的响应可以通过后续具有交替正交偏振的曝光多次切换。最后,我们表明,通过将样品加热到临界液相色谱转变温度以上,液相色谱转变为其各向同性相,可以暂时擦除图像。演示的方法代表了逐光控制概念,是电光或机电控制方法的替代方案,后者需要复杂的电子架构进行空间分辨调制。 我们的结果对于下一代显示器或空间光调制器等应用具有重要潜力,这些应用需要对可调谐、定制的光学响应进行空间控制。
更新日期:2025-01-21
中文翻译:
液晶赋能超表面的空间控制全光切换
将超表面嵌入液晶 (LC) 单元是实现可调谐光学功能的一种很有前途的技术。在这里,我们展示了均质硅纳米圆柱形超表面的空间控制全光切换,该超表面在 670 至 720 nm 的光谱范围内具有各种 Mie 型共振,集成在向列 LC 单元中。液相色谱分子的初始对准由光对准层控制,其中对准方向由 450 nm 波长的线偏振光均匀曝光定义。用相同的光曝光光取向层,其偏振旋转 90°,导致 LC 取向的局部变化并调制超表面的光学响应。通过高光谱成像来表征超表面系统的空间依赖性光学特性。所描述的技术允许以非易失性方式创建空间分辨率为 20 μm 的复杂空间光谱响应函数。此外,我们证明 LC 集成超表面的响应可以通过后续具有交替正交偏振的曝光多次切换。最后,我们表明,通过将样品加热到临界液相色谱转变温度以上,液相色谱转变为其各向同性相,可以暂时擦除图像。演示的方法代表了逐光控制概念,是电光或机电控制方法的替代方案,后者需要复杂的电子架构进行空间分辨调制。 我们的结果对于下一代显示器或空间光调制器等应用具有重要潜力,这些应用需要对可调谐、定制的光学响应进行空间控制。