journal article·2009-12-18

Low‐Frequency Raman Scattering from Nanocrystals Caused by Coherent Excitation of Phonons

X. L. Wu, S. J. Xiong, L. T. Sun, J. C. Shen, P. K. Chu

Small· Volume 5· Issue 24
Publisher page

Abstract

Ultrahigh-resolution transmission electron microscopy clearly reveals the absence of a disordered or softer interface layer between GexSi1–x nanocrystals (NCs) and the SiO2 matrix. A theory shows that the collective modes comprising coherent excitation of phonons in a large number of NCs contribute to the Raman scattering. This work provides a new understanding of low-frequency Raman scattering from NC-embedded matrices.
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Research context

OpenAlex topics: Silicon Nanostructures and Photoluminescence · Spectroscopy Techniques in Biomedical and Chemical Research · Mechanical and Optical Resonators

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