Nanophotonics | |
Breaking polarisation-bandwidth trade-off in dielectric metasurface for unpolarised white light | |
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
【 预 览 】
Files | Size | Format | View |
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RO202107200003460ZK.pdf | 1149KB | download |