An Ultra-high Numerical Aperture Metalens at Visible Wavelengths

Haowen Liang, Qiaoling Lin, Xiangsheng Xie +8

We demonstrate a metalens with NA = 0.98 in air, a bandwidth (FWHM) of 274 nm and a focusing efficiency of 67% at 532 nm wavelength, which is close to the transmission performance…