Optical second-harmonic generation from silicon nanocrystals

Michael C. Downer; Peter C. Figliozzi; Yingying Jiang; Liangfeng Sun; Brian Mattern; C. Woody White; Steve P. Withrow

doi:10.1117/12.511483

4 December 2003 Optical second-harmonic generation from silicon nanocrystals

Michael C. Downer, Peter C. Figliozzi, Yingying Jiang, Liangfeng Sun, Brian Mattern, C. Woody White, Steve P. Withrow

Author Affiliations +

Proceedings Volume 5223, Physical Chemistry of Interfaces and Nanomaterials II; (2003) https://doi.org/10.1117/12.511483
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

Optical second-harmonic generation (SHG)is used as a noninvasive probe of the interfaces of Si nanocrystals (SiNCs)embedded in an SiO₂ matrix. We verify experimentally that the second-harmonic polarization P⁽²⁾ has a quadrupolar form proportional to (E ·∇) E as proposed in recent models based on a locally noncentrosymmetric dipolar polarization averaged over the spherical NC interface. A two-beam sum-frequency geometry is found to enhance this polarization dramatically compared to a single-beam SHG geometry, yielding strong signals useful for scanning, spectroscopy and real time monitoring. Using this two beam geometry, we have produced non-invasive two dimensional SHG maps with few-micron resolution of 1-micron-thick layers of Si-NCs (3 and 5 nm average diameter)produced by ion implanting Si into SiO₂. Samples were scanned over a 5mm x 5mm area with two non-collinear,orthogonally polarized,amplified Ti:S laser pulses (80 fs,810nm,100 μJ,1 kHz repetition rate) while detecting the generated SH signal in transmission. The SHG signal is sensitive to chemical modification of the Si/SiO₂ interface and to local gradients in nanoparticle density.

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Michael C. Downer, Peter C. Figliozzi, Yingying Jiang, Liangfeng Sun, Brian Mattern, C. Woody White, and Steve P. Withrow "Optical second-harmonic generation from silicon nanocrystals", Proc. SPIE 5223, Physical Chemistry of Interfaces and Nanomaterials II, (4 December 2003); https://doi.org/10.1117/12.511483

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KEYWORDS

Second-harmonic generation

Signal detection

Polarization

Glasses

Interfaces

Nanocrystals

Silicon

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