Plasmonics

, Volume 5, Issue 2, pp 207–212

Hybrid Plasmonic Waveguide Based on Tapered Dielectric Nanoribbon: Excitation and Focusing

Article

DOI: 10.1007/s11468-010-9135-x

Cite this article as:
Fang, Z., Qi, H., Wang, C. et al. Plasmonics (2010) 5: 207. doi:10.1007/s11468-010-9135-x

Abstract

The nanofocusing of light source was proposed and simulated using the dielectric-loaded surface plasmon polariton (SPP) model with various laterally tapered planar dielectric architectures on the top surface of the metal. By using finite-difference time-domain method, enhancement factor for the local electric field under distinctive incident polarization was analyzed with different taper apexes under various incident wavelengths and incident angles of the excitation laser. The SPP dispersion and the effect of dissipation on adiabatic nanofocusing of SPP in a sharp taper structure were used to predict the optimal taper angles of the structure and to explain the phenomena of SPP wave slowing down as it propagating toward the taper end. This SPP nanofocusing process was also experimentally realized by illuminating the structure of a tapered CdS nanoribbon deposited on the Ag surface. As the emission of the focused SPP at the taper end, the proposed plasmonic structure can be severed as a light nanosource emitter in the future optical integrated circuits.

Keywords

Surface plasmon polaritonNear-field microscopyWaveguidesMetal opticsNanostructure

Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.School of Physics, State Key Laboratory for Mesoscopic PhysicsPeking UniversityBeijingPeople’s Republic of China
  2. 2.National Center for Nanoscience and TechnologyBeijingPeople’s Republic of China