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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 18 — Aug. 27, 2012
  • pp: 20342–20355

Plasmonic mode converter for controlling optical impedance and nanoscale light-matter interaction

Yun-Ting Hung, Chen-Bin Huang, and Jer-Shing Huang  »View Author Affiliations

Optics Express, Vol. 20, Issue 18, pp. 20342-20355 (2012)

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To enable multiple functions of plasmonic nanocircuits, it is of key importance to control the propagation properties and the modal distribution of the guided optical modes such that their impedance matches to that of nearby quantum systems and desired light-matter interaction can be achieved. Here, we present efficient mode converters for manipulating guided modes on a plasmonic two-wire transmission line. The mode conversion is achieved through varying the path length, wire cross section and the surrounding index of refraction. Instead of pure optical interference, strong near-field coupling of surface plasmons results in great momentum splitting and modal profile variation. We theoretically demonstrate control over nanoantenna radiation and discuss the possibility to enhance nanoscale light-matter interaction. The proposed converter may find applications in surface plasmon amplification, index sensing and enhanced nanoscale spectroscopy.

© 2012 OSA

OCIS Codes
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(240.6680) Optics at surfaces : Surface plasmons
(250.7360) Optoelectronics : Waveguide modulators
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

Original Manuscript: June 20, 2012
Revised Manuscript: August 13, 2012
Manuscript Accepted: August 16, 2012
Published: August 21, 2012

Virtual Issues
Vol. 7, Iss. 10 Virtual Journal for Biomedical Optics

Yun-Ting Hung, Chen-Bin Huang, and Jer-Shing Huang, "Plasmonic mode converter for controlling optical impedance and nanoscale light-matter interaction," Opt. Express 20, 20342-20355 (2012)

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