Nonradiating Silicon Nanoantenna Metasurfaces as Narrowband Absorbers

Chi Yin Yang, Jhen Hong Yang, Zih Ying Yang, Zhong Xing Zhou, Mao Guo Sun, Viktoriia E. Babicheva, Kuo-Ping Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

41 Scopus citations

Abstract

High-refractive-index (HRI) nanostructures support optically induced electric dipole (ED) and magnetic dipole (MD) modes that can be used to control scattering and achieve narrowband absorption. In this work, a high-absorptance device is proposed and realized by using amorphous silicon nanoantenna (a-Si NA) arrays that suppress backward and forward scattering with engineered structures and in particular periods. The overlap of ED and MD resonances, by designing an array with a specific period and exciting lattice resonances, is experimentally demonstrated. The absorptance of a-Si NA arrays increases 3-fold in the near-infrared range in comparison to unpatterned silicon films. Nonradiating a-Si NA arrays can achieve high absorptance with a small resonance bandwidth (Q = 11.89) at a wavelength of 785 nm. The effect is observed not only due to the intrinsic loss of material but by overlapping the ED and MD resonances.

Original languageEnglish
Pages (from-to)2596-2601
Number of pages6
JournalACS Photonics
Volume5
Issue number7
DOIs
StatePublished - 18 Jul 2018

Keywords

  • absorber
  • dielectric nanoantennas
  • high-refractive-index (HRI)
  • metasurfaces

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