https://scholars.lib.ntu.edu.tw/handle/123456789/621106
標題: | Integrated Resonant Unit of Metasurfaces for Broadband Efficiency and Phase Manipulation | 作者: | Hsiao H.-H. Chen Y.H. Lin R.J. Wu P.C. Wang S. Chen B.H. Tsai D.P. HUI-HSIN HSIAO |
關鍵字: | achromatic deflectors; achromatic metalenses; integrated-resonant units; versatile polarization generator; visible metasurfaces | 公開日期: | 2018 | 卷: | 6 | 期: | 12 | 來源出版物: | Advanced Optical Materials | 摘要: | Integrated-resonant units (IRUs), incorporated with multiple resonators into one building block or one resonator with multiple modes, show a great capacity for achieving controllable smooth and linear phase dispersion as well as amplitude manipulation over a continuous and broad bandwidth. Based on an IRU library designed in the wavelength range of 400 to 667 nm, three achromatic deflectors showing constant steering angles of 9.5°, 19°, and 28°, respectively, are numerically validated. Achromatic metalenses with various numerical aperture (NA) values are further experimentally demonstrated, displaying an unvaried focal length throughout the bandwidth of 420–650 nm (≈50% bandwidth to the central wavelength). The focusing efficiency of the achromatic metalens with NA = 0.124 achieves 26.31%, 19.71%, and 20.37%, respectively, at wavelengths of 420, 550, and 650 nm. In addition, a multi-nanorod IRU design is numerically optimized to achieve above 50% conversion efficiency from visible to near-infrared (400–1400 nm). Such IRU design is then employed to construct a versatile polarization convertor, generating six different polarization states simultaneously upon one linear-polarized illumination. The IRU approach with broadband control of amplitude and phase response provides an unprecedented platform in realizing multifunctional full-color metadevices. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85046827152&doi=10.1002%2fadom.201800031&partnerID=40&md5=44042bc2086bd35f3eaa4242b8195b5b https://scholars.lib.ntu.edu.tw/handle/123456789/621106 |
DOI: | 10.1002/adom.201800031 | SDG/關鍵字: | Bandwidth; Infrared devices; Nanorods; Polarization; Resonators; Achromatic deflectors; Achromatic metalenses; Integrated-resonant units; Metasurfaces; Versatile polarization generator; Efficiency |
顯示於: | 工程科學及海洋工程學系 |
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