Achromatic Varifocal Metalens for the Visible Spectrum
Achromatic Varifocal Metalens for the Visible Spectrum
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DOI：
10.1021/acsphotonics.9b00523
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发表时间：
2019-10-01
期刊：
影响因子：
7
通讯作者：
Acosta, Victor M.
中科院分区：
文献类型：
--
作者：
Aiello, Maxwell D.;Backer, Adam S.;Acosta, Victor M.
超表面光学器件提供了传统折射透镜的替代方案。目前的挑战是实现在可见光谱范围内表现出可调光学特性和消色差行为的超颖表面。在这里，我们报告的设计，制造和表征的超表面透镜（“metalenses”），使用不对称的二氧化钛（TiO 2）纳米结构诱导偏振相关的光学响应。通过旋转线偏振输入光的偏振，将40 μ m直径的超透镜的焦距从220 μ m调谐到550 μ m。我们表明，赋予入射光的波长依赖性偏振旋转，使消色差的可见光谱，483-620 nm的宽带聚焦。我们使用这个属性，以证明变焦彩色成像与白色光从卤素源。我们还讨论了如何可调消色差超透镜可能是有用的显示应用。
Metasurface optics provide an ultrathin alternative to conventional refractive lenses. A present challenge is in realizing metasurfaces that exhibit tunable optical properties and achromatic behavior across the visible spectrum. Here, we report the design, fabrication, and characterization of metasurface lenses ("metalenses") that use asymmetric titanium dioxide (TiO2) nanostructures to induce a polarization-dependent optical response. By rotating the polarization of linearly polarized input light, the focal length of a 40 mu m diameter metalens is tuned from 220 to 550 mu m. We show that imparting a wavelength-dependent polarization rotation on incident light enables achromatic focusing over a wide band of the visible spectrum, 483-620 nm. We use this property to demonstrate varifocal color imaging with white light from a halogen source. We also discuss how tunable achromatic metalenses may be useful for display applications.