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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 8 — Apr. 9, 2012
  • pp: 8710–8717

Electrically generated unidirectional surface plasmon source

L. Wang, T. Li, L. Li, W. Xia, X. G. Xu, and S. N. Zhu  »View Author Affiliations


Optics Express, Vol. 20, Issue 8, pp. 8710-8717 (2012)
http://dx.doi.org/10.1364/OE.20.008710


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Abstract

We experimentally demonstrated an electrically excited surface plasmon source, which was fulfilled in a silver coated light emitting diode (LED) with well-designed gratings. With a DC current supply, surface plasmon polariton (SPP) waves were generated directly from the illuminations of the LED via the grating coupler. By adjusting the grating to a tilted one, a unidirectional SPP beam was successfully attained with a high extinction ratio (ER~10) and an improved launching efficiency. Detailed analyses show that this electrically generated unidirectional SPP has a considerable long propagation distance (~14μm), allowing for further manipulations in plasmonic integrations and sensors.

© 2012 OSA

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(230.3670) Optical devices : Light-emitting diodes
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Optics at Surfaces

History
Original Manuscript: January 10, 2012
Revised Manuscript: March 19, 2012
Manuscript Accepted: March 24, 2012
Published: March 30, 2012

Citation
L. Wang, T. Li, L. Li, W. Xia, X. G. Xu, and S. N. Zhu, "Electrically generated unidirectional surface plasmon source," Opt. Express 20, 8710-8717 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-8-8710


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  24. These 400 dipole sources are linearly placed with an interval of dL = 50 nm (much than the grating period) and oriented along x-direction for the purpose of efficient TM excitation. In simulations, we calculated the illumination process of these 400 dipoles in total for one time with well-defined dipole locations, phases and polarizations. Although it is a coherent process, it can provide preliminary information of the coupling from the dispersive LED illumination to the SPP surface waves.

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