A broadband achromatic polarization-insensitive metalens consisting of anisotropic nanostructures

被引:467
作者
Chen, Wei Ting [1 ]
Zhu, Alexander Y. [1 ]
Sisler, Jared [1 ,2 ]
Bharwani, Zameer [1 ,2 ]
Capasso, Federico [1 ]
机构
[1] Harvard Univ, Harvard John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[2] Univ Waterloo, Waterloo, ON N2L 3G1, Canada
基金
美国国家科学基金会;
关键词
DIELECTRIC METASURFACES; VISIBLE WAVELENGTHS; PHASE; HOLOGRAMS; OPTICS; LENSES;
D O I
10.1038/s41467-019-08305-y
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Metasurfaces have attracted widespread attention due to an increasing demand of compact and wearable optical devices. For many applications, polarization-insensitive metasurfaces are highly desirable, and appear to limit the choice of their constituent elements to isotropic nanostructures. This greatly restricts the number of geometric parameters available in design. Here, we demonstrate a polarization-insensitive metalens using otherwise anisotropic nanofins which offer additional control over the dispersion and phase of the output light. As a result, we can render a metalens achromatic and polarization-insensitive across nearly the entire visible spectrum from wavelength lambda = 460 nm to 700 nm, while maintaining diffraction-limited performance. The metalens is comprised of just a single layer of TiO2 nanofins and has a numerical aperture of 0.2 with a diameter of 26.4 mu m. The generality of our polarization-insensitive design allows it to be implemented in a plethora of other metasurface devices with applications ranging from imaging to virtual/augmented reality.
引用
收藏
页数:7
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