Multi-wavelength unidirectional forward scattering properties of the arrow-shaped gallium phosphide nanoantenna

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Jingwei LV
  • Yanru REN
  • Debao WANG
  • Xinchen XU
  • Wei LIU
  • Jianxin WANG
  • Chao LIU

Detail(s)

Original languageEnglish
Pages (from-to)2034-2044
Journal / PublicationJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume40
Issue number11
Online published19 Oct 2023
Publication statusPublished - Nov 2023

Abstract

An arrow-shaped gallium phosphide nanoantenna exhibits both near-field electric field enhancement and far-field unidirectional scattering, and the interference conditions involve electric and magnetic quadrupoles as well as toroidal dipoles. By using long-wavelength approximation and exact multipole decomposition, the interference conditions required for far-field unidirectional transverse light scattering and backward near-zero scattering at multiple wavelengths are determined. The near-field properties are excellent, as exemplified by large Purcell factors of 4.5 x 109 for electric dipole source excitation, 464.68 for magnetic dipole source excitation, and 700 V/m for the field enhancement factor. The degree of enhancement of unidirectional scattering is affected by structural parameters such as the angle and thickness of the nanoantenna. The arrow-shaped nanoantenna is an efficient platform to enhance the electric field and achieve high directionality of light scattering.Moreover, the nanostructure enables flexible manipulation of light waves and materials, giving rise to superior near-field and far-field performances, which are of great importance pertaining to the practicability and application potential of optical antennas in applications such as spectroscopy, sensing, displays, and optoelectronic devices. © 2023 Optica Publishing Group.

Citation Format(s)

Multi-wavelength unidirectional forward scattering properties of the arrow-shaped gallium phosphide nanoantenna. / LV, Jingwei; REN, Yanru; WANG, Debao et al.
In: Journal of the Optical Society of America A: Optics and Image Science, and Vision, Vol. 40, No. 11, 11.2023, p. 2034-2044.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review