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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 9 — Sep. 1, 2013
  • pp: 2452–2460

Optical second-harmonic generation selection rules and resonances in buried oxide interfaces: the case of LaAlO3/SrTiO3

Domenico Paparo, Andrea Rubano, and Lorenzo Marrucci  »View Author Affiliations

JOSA B, Vol. 30, Issue 9, pp. 2452-2460 (2013)

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Despite an intense research effort, the physical mechanism underlying the formation of a quasi-two-dimensional electron gas at the interface between the band insulators LaAlO3 and SrTiO3 is still not fully understood. Interface-sensitive optical second-harmonic spectroscopy can shed light on this mechanism, by accessing specific information on the orbital and structural reconstruction taking place at the interface that is not accessible by other techniques, and in particular by transport measurements. Here we present a detailed theoretical analysis of the spectral transitions that are most relevant in the second-order nonlinear optical response of oxide interfaces with a square symmetry, in general. In particular, we discuss the case of LaAlO3/SrTiO3 interfaces, using symmetry arguments to derive specific selection rules, which have strong consequences on the second-harmonic spectra recorded with different input/output polarization combinations of light. These selection rules may in particular explain recent experimental findings.

© 2013 Optical Society of America

OCIS Codes
(190.0190) Nonlinear optics : Nonlinear optics
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(240.4350) Optics at surfaces : Nonlinear optics at surfaces
(300.6490) Spectroscopy : Spectroscopy, surface
(240.1485) Optics at surfaces : Buried interfaces

ToC Category:
Optics at Surfaces

Original Manuscript: April 16, 2013
Revised Manuscript: July 23, 2013
Manuscript Accepted: July 28, 2013
Published: August 23, 2013

Domenico Paparo, Andrea Rubano, and Lorenzo Marrucci, "Optical second-harmonic generation selection rules and resonances in buried oxide interfaces: the case of LaAlO3/SrTiO3," J. Opt. Soc. Am. B 30, 2452-2460 (2013)

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