Research progress of active metasurfaces based on liquid crystals
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摘要:
超表面具有亚波长尺度下精密高效的光波操控能力，但在其单独实现主动式调控方面，目前仍有诸多技术困难亟待克服。液晶与超表面的结合有望发挥各自的长处，实现一种分辨率高、衍射角大、超紧凑的新型主动式光调控器件。以液晶与超表面两部分功能设计的独立与否作为分类依据，回顾了近年来主动式液晶超表面的研究进展，具体包括液晶波片与偏振敏感超表面结合、液晶环境与共振型超表面结合、液晶与超表面光学性质互补等。最后对主动式液晶超表面所面临的挑战以及发展前景进行了讨论和展望。
Abstract:The metasurfaces have the ability to precisely and efficiently manipulate the light wave at sub-wavelength scale. However, there are still many technical difficulties to be overcome when it comes to the realization of active control separately. The combination of liquid crystal (LCs) and metasurface is expected to give full play to their respective advantages to achieve a new type of active optical control device with high resolution, large diffraction angle and ultra-compact structure. The independent functional design of LC and metasurface was taken as the classification basis to review the research progress of active LC metasurfaces in recent years, which specifically included the combination of LC wave plate and polarization-sensitive metasurfaces, the combination of LC environment and resonant metasurfaces, and complementation of optical properties with LC and metasurface. Finally, the challenges and development prospects of active LC metasurface were discussed and prospected.
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Keywords:
- active metasurfaces /
- liquid crystal /
- wavefront manipulation /
- spectral control /
- dynamic display
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图 2 液晶波片放于超表面之前的动态全息显示
Figure 2. Dynamic holographic display of liquid crystal wave plate set before metasurface
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图 3 液晶波片放于超表面之后的动态全息显示
Figure 3. Dynamic holographic display of liquid crystal wave plate set behind metasurface
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图 4 基于液晶波片的超透镜焦点位置控制
Figure 4. Focus position control of metalens based on liquid crystal wave plate
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图 5 基于液晶波片对单波长入射光的透射率调制
Figure 5. Transmittance modulation of single-wavelength incident light based on liquid crystal wave plate
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图 6 基于液晶波片对白光入射光的结构色调制
Figure 6. Structural-color modulation of white incident light based on liquid crystal wave plate
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图 7 液晶赋予超表面可调的圆二向色性
Figure 7. Tunable circular dichroism of metasurface based on liquid crystal
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图 8 液晶折射率作为变量参与超表面的参数优化过程
Figure 8. Parameter optimization process of metasurface for refractive index of liquid crystal as variable
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图 9 液晶与超表面光学特性互补
Figure 9. Complementation of optical properties with liquid crystal and metasurface
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图 10 基于温控液晶的超表面共振特性调节
Figure 10. Resonance characteristics modulation of metasurface based on temperature-controlled liquid crystal
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