An Ultra-high Numerical Aperture Metalens at Visible Wavelengths
Haowen Liang, Qiaoling Lin, Xiangsheng Xie, Qian Sun, Yin Wang, Lidan, Zhou, Lin Liu, Xiangyang Yu, Jianying Zhou, Thomas F Krauss, and Juntao Li
TL;DR
This paper reports the development of an ultra-high numerical aperture metalens operating at visible wavelengths, achieving record NA values through innovative design and immersion techniques.
Contribution
The work introduces a metalens with the highest NA in the visible spectrum, utilizing immersion oil to reach NA of 1.48 experimentally and 1.73 theoretically.
Findings
Achieved NA of 0.98 in air with 67% efficiency at 532 nm
Demonstrated immersion oil immersion to reach NA of 1.48 experimentally
Theoretically predicted NA of 1.73 with immersion, highest in visible metalenses
Abstract
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 of a TiO2 metalens. Moreover, and uniquely so, our metalens can be front-immersed into immersion oil and achieve an ultra-high NA of 1.48 experimentally and 1.73 theoretically, thereby demonstrating the highest NA of any metalens in the visible regime reported to the best of our knowledge.
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