Breaking polarisation-bandwidth trade-off in dielectric metasurface for unpolarised white light

Nanophotonics

article

Muhammad Afnan Ansari¹  Tauseef Tauqeer¹  Muhammad Zubair¹  Muhammad Qasim Mehmood¹ 

[1] NanoTech Lab, Department of Electrical Engineering, Information Technology University of the Punjab

关键词: metahologram;    broadband;    polarisation insensitive;    anisotropic nanorods;    dielectric metasurface;   

DOI  :  10.1515/nanoph-2020-0046

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Optical metasurfaces have gained attention due to their considerable prospects, which can benefit consumers and industries in terms of virtual reality devices and digital displays in various multimedia and entertainment-related applications. To date, most of the metasurface optimisation strategies involving isotropic or anisotropic nanoantennas encounter a trade-off between polarisation insensitivity and operating bandwidth under unpolarised white light, which is a fundamental requirement for many applications in digital displays. We presented a novel technique to break the trade-off between polarisation insensitivity and bandwidth by engineering the displacement dependent phase delay of the adjacent parallel and perpendicular anisotropic nanoantennas in a dielectric metasurface. As a result, we numerically demonstrate a highly efficient metasurface operating at an almost entire visible domain (wavelength of 450 nm–650 nm) while maintaining a constant phase modulation under all polarisation states, thus enabling the polarisation-insensitive metadevices for unpolarised white light.

【 授权许可】

CC BY