Achromatic Varifocal Metalens for the Visible Spectrum,ACS Photonics

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Achromatic Varifocal Metalens for the Visible Spectrum
ACS Photonics ( IF 6.5 ) Pub Date : 2019-09-17 , DOI: 10.1021/acsphotonics.9b00523
Maxwell D. Aiello ₁ , Adam S. Backer _{1,

2} , Aryeh J. Sapon ₁ , Janis Smits _{1,

3} , John D. Perreault ₄ , Patrick Llull ₄ , Victor M. Acosta ₁

Affiliation

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 μm diameter metalens is tuned from 220 to 550 μm. 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.

中文翻译：

可见光谱的消色差变金属

超表面光学器件提供了传统折射透镜的超薄替代品。当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，我们报告使用不对称二氧化钛（TiO ₂纳米结构，以诱导偏振相关的光学响应。通过旋转线性偏振输入光的偏振，直径为40μm的金属透镜的焦距从220调整到550μm。我们表明，对入射光施加与波长相关的偏振旋转，可以在可见光谱（483-620 nm）的宽频带上进行消色差聚焦。我们使用此属性来演示卤素光源发出的白光的全焦点彩色成像。我们还将讨论可调谐消色差金属感镜如何用于显示应用。

更新日期：2019-09-18

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