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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 2 — Jan. 28, 2013
  • pp: 1898–1910

Compact on-chip plasmonic light concentration based on a hybrid photonic-plasmonic structure

Ye Luo, Maysamreza Chamanzar, and Ali Adibi  »View Author Affiliations

Optics Express, Vol. 21, Issue 2, pp. 1898-1910 (2013)

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We present a novel approach for achieving tightly concentrated optical field by a hybrid photonic-plasmonic device in an integrated platform, which is a triangle-shaped metal taper mounted on top of a dielectric waveguide. This device, which we call a plasmomic light concentrator (PLC), can achieve vertical coupling of light energy from the dielectric waveguide to the plasmonic region and light focusing into the apex of the metal taper(at the scale ∼ 10nm) at the same time. For a demonstration of the PLCs presented in this paper, we numerically investigate the performance of a gold taper on a Si3N4 waveguide at working wavelengths around 800nm. We show that three major effects (mode beat, nanofocusing, and weak resonance) interplay to generate this light concentration phenomenon and govern the performance of the device. Combining these effects, the PLC can be designed to be super compact while maintaining high efficiency over a wide band. In particular, we demonstrate that under optimized size parameters and wavelength a field concentration factor (FCF), which is the ratio of the norm of the electric field at the apex over the average norm of the electric field in the inputting waveguide, of about 13 can be achieved with the length of the device less than 1μm for a moderate tip radius 20nm. Moreover, we show that a FCF of 5 – 10 is achievable over a wavelength range of 700 – 1100nm with the length of the device further reduced (to about 400nm).

© 2013 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: November 5, 2012
Revised Manuscript: December 30, 2012
Manuscript Accepted: January 9, 2013
Published: January 17, 2013

Ye Luo, Maysamreza Chamanzar, and Ali Adibi, "Compact on-chip plasmonic light concentration based on a hybrid photonic-plasmonic structure," Opt. Express 21, 1898-1910 (2013)

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