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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 8 — Apr. 11, 2011
  • pp: 7262–7273

Second harmonic generation based on strong field enhancement in nanostructured THz materials

Hannes Merbold, Andreas Bitzer, and Thomas Feurer  »View Author Affiliations


Optics Express, Vol. 19, Issue 8, pp. 7262-7273 (2011)
http://dx.doi.org/10.1364/OE.19.007262


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Abstract

The THz response of slit structures and split-ring resonators (SRRs) featuring extremely small gaps on the micro- or nanoscale is investigated numerically. Both structures exhibit strong field enhancement in the gap region due to light-induced current flows and capacitive charging across the gap. Whereas nanoslits allow for broadband enhancement the resonant behavior of the SRRs leads to narrowband amplification and results in significantly higher field enhancement factors reaching several 10,000. This property is particularly beneficial for the realization of nonlinear THz experiments which is exemplarily demonstrated by a second harmonic generation process in a nonlinear substrate material. Positioning nanostructures on top of the substrate is found to result in a significant increase of the generation efficiency for the frequency doubled component.

© 2011 OSA

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(190.4360) Nonlinear optics : Nonlinear optics, devices
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Nonlinear Optics

History
Original Manuscript: February 17, 2011
Revised Manuscript: March 12, 2011
Manuscript Accepted: March 13, 2011
Published: March 31, 2011

Citation
Hannes Merbold, Andreas Bitzer, and Thomas Feurer, "Second harmonic generation based on strong field enhancement in nanostructured THz materials," Opt. Express 19, 7262-7273 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-8-7262


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