Integrated Resonant Unit of Metasurfaces for Broadband Efficiency and Phase Manipulation

Hui Hsin Hsiao, Yu Han Chen, Ren Jie Lin, Pin Chieh Wu, Shuming Wang, Bo Han Chen, Din Ping Tsai

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number1800031
JournalAdvanced Optical Materials
Volume6
Issue number12
DOIs
Publication statusPublished - 2018 Jun 19

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All Science Journal Classification (ASJC) codes

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

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