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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 7 — Jul. 1, 2013
  • pp: 1975–1980

Doubly resonant Ag–LiNbO3 embedded coaxial nanostructure for high second-order nonlinear conversion

Elsie Barakat, Maria-Pilar Bernal, and Fadi Issam Baida  »View Author Affiliations


JOSA B, Vol. 30, Issue 7, pp. 1975-1980 (2013)
http://dx.doi.org/10.1364/JOSAB.30.001975


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Abstract

Coaxial nanopatterned lithium niobate embedded in Ag enables a large electromagnetic confinement in small-volume cavities. The nonlinear material filling these cavities is at the origin of high second-order nonlinear conversion, where no phase matching is needed. A doubly resonant optical spectrum of the linear response is required in order to boost this phenomenon, providing a promising and stable second-harmonic (SH) device tailored for any desired wavelength. The structure is fabricated by using electron-beam lithography, dry etching, and chemical mechanical polishing. We report a second-harmonic generation (SHG) enhancement factor of 26 compared to unpatterned x-cut lithium niobate wafer at λpump=1550nm. The enhancement, which comes exclusively from the nanostructured lithium niobate, is experimentally and theoretically demonstrated. A comparison with three types of metallic subwavelength apertures is shown. The embedded structure shows the strongest SH signal. Analysis of the strong dependence of the incident polarization on the SHG intensity with a homemade 3D–NL–FDTD algorithm shows good agreement with experimental data.

© 2013 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(130.3730) Integrated optics : Lithium niobate
(130.4310) Integrated optics : Nonlinear
(220.0220) Optical design and fabrication : Optical design and fabrication
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: January 25, 2013
Revised Manuscript: May 10, 2013
Manuscript Accepted: May 14, 2013
Published: June 26, 2013

Citation
Elsie Barakat, Maria-Pilar Bernal, and Fadi Issam Baida, "Doubly resonant Ag–LiNbO3 embedded coaxial nanostructure for high second-order nonlinear conversion," J. Opt. Soc. Am. B 30, 1975-1980 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-7-1975

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