Integrated Resonant Unit of Metasurfaces for Broadband Efficiency and Phase Manipulation

H.-H. Hsiao, Y.H. Chen, R.J. Lin, P.C. Wu, S. Wang, B.H. Chen, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

33 Citations (Scopus)

Abstract

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimIntegrated-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.
Original languageEnglish
Article number1800031
JournalAdvanced Optical Materials
Volume6
Issue number12
DOIs
Publication statusPublished - 19 Jun 2018
Externally publishedYes

Keywords

  • achromatic deflectors
  • achromatic metalenses
  • integrated-resonant units
  • versatile polarization generator
  • visible metasurfaces

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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