Comprehensive analysis of photonic nanojets in 3D dielectric cuboids excited by surface plasmons

Victor Pacheco-Peña, Igor V. Minin, Oleg V. Minin, Miguel Beruete

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

In this paper we study the excitation of photonic nanojets (PNJ) in 3D dielectric cuboids by surface plasmons at telecommunication wavelengths. The analysis is done using the effective refractive index approach. It is shown that the refractive index contrast between the regions with and without cuboid should be roughly less than 2 in order to generate jets at the output of the cuboid. The best performance at λ0 = 1550 nm is obtained when the height of the cuboid is 160 nm producing a jet just at the output interface with a subwavelength resolution of 0.68λ0 and a high intensity enhancement (×5) at the focus. The multi-wavelength response is also studied demonstrating that it is possible to use the proposed structure at different wavelengths. Finally, the backscattering enhancement is numerically evaluated by inserting a metal particle within the PNJ region, demonstrating a maximum value of ∼2.44 dB for a gold sphere of radius 0.1λ0. (Figure presented.).

Original languageEnglish
Pages (from-to)684-692
Number of pages9
JournalAnnalen der Physik
Volume528
Issue number9-10
DOIs
Publication statusPublished - 1 Oct 2016
Externally publishedYes

Keywords

  • Photonic nanojets
  • SPP
  • surface plasmons
  • telecom wavelengths

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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