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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 13 — Jul. 1, 2014
  • pp: 3833–3836

Strain dependence of the nonlinear optical properties of strained Si nanoparticles

Soumen Dhara, Kenji Imakita, P. K. Giri, and Minoru Fujii  »View Author Affiliations

Optics Letters, Vol. 39, Issue 13, pp. 3833-3836 (2014)

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We report on the lattice strain dependence of the nonlinear optical (NLO) parameters of strained Si nanoparticles (NPs), which are prepared in a controlled way by a mechanical ball milling process. X-ray diffraction analysis shows that the nature of strain is compressive and is primarily caused by milling-induced lattice dislocations, which is further supported by high-resolution transmission electron microscopy imaging. It is found that the nonlinear refractive index (n2) and nonlinear absorption coefficient (β) are strongly influenced by the associated lattice strain present in Si NPs. With the increase of lattice strain, the β gradually decreases while n2 increases slowly. The strain-dependent observed changes in the NLO parameters of Si NPs are found to be advantageous for application purpose, and it is explained on the basis of strain-induced modification in the electronic structure of the highest occupied molecular orbital and lowest unoccupied molecular orbital states of Si NPs. These results demonstrate the potential of strain-dependent enhancement of nonlinearities for silicon photonics applications.

© 2014 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter

ToC Category:
Nonlinear Optics

Original Manuscript: April 22, 2014
Revised Manuscript: May 26, 2014
Manuscript Accepted: May 26, 2014
Published: June 23, 2014

Soumen Dhara, Kenji Imakita, P. K. Giri, and Minoru Fujii, "Strain dependence of the nonlinear optical properties of strained Si nanoparticles," Opt. Lett. 39, 3833-3836 (2014)

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