Optical phonon modes of CdSe quantum dots in a glass matrix

Young Nam Hwang, Sang Cheon Kim, Seung Han Park, Ung Kim, Dongho Kim

Research output: Contribution to conferencePaper

Abstract

The major mechanisms of Raman broadening of phonon modes are discussed based on the phonon relaxation at the boundary of nanocrystals. The negative phonon dispersion is compensated by the lattice contraction for the longitudinal phonons which results in an almost constant Raman shift. However, the surface phonon frequency is rapidly increased with decreasing quantum dot size which originates from the constructive coupling of positive phonon dispersion and lattice contraction.

Original languageEnglish
Pages95-96
Number of pages2
Publication statusPublished - 1997 Jan 1
EventProceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim - Chiba, Jpn
Duration: 1997 Jul 141997 Jul 18

Other

OtherProceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim
CityChiba, Jpn
Period97/7/1497/7/18

Fingerprint

Laser modes
Semiconductor quantum dots
contraction
quantum dots
Glass
glass
Phonons
matrices
Nanocrystals
nanocrystals
phonons
shift

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Hwang, Y. N., Kim, S. C., Park, S. H., Kim, U., & Kim, D. (1997). Optical phonon modes of CdSe quantum dots in a glass matrix. 95-96. Paper presented at Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim, Chiba, Jpn, .
Hwang, Young Nam ; Kim, Sang Cheon ; Park, Seung Han ; Kim, Ung ; Kim, Dongho. / Optical phonon modes of CdSe quantum dots in a glass matrix. Paper presented at Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim, Chiba, Jpn, .2 p.
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Hwang, YN, Kim, SC, Park, SH, Kim, U & Kim, D 1997, 'Optical phonon modes of CdSe quantum dots in a glass matrix' Paper presented at Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim, Chiba, Jpn, 97/7/14 - 97/7/18, pp. 95-96.

Optical phonon modes of CdSe quantum dots in a glass matrix. / Hwang, Young Nam; Kim, Sang Cheon; Park, Seung Han; Kim, Ung; Kim, Dongho.

1997. 95-96 Paper presented at Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim, Chiba, Jpn, .

Research output: Contribution to conferencePaper

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N2 - The major mechanisms of Raman broadening of phonon modes are discussed based on the phonon relaxation at the boundary of nanocrystals. The negative phonon dispersion is compensated by the lattice contraction for the longitudinal phonons which results in an almost constant Raman shift. However, the surface phonon frequency is rapidly increased with decreasing quantum dot size which originates from the constructive coupling of positive phonon dispersion and lattice contraction.

AB - The major mechanisms of Raman broadening of phonon modes are discussed based on the phonon relaxation at the boundary of nanocrystals. The negative phonon dispersion is compensated by the lattice contraction for the longitudinal phonons which results in an almost constant Raman shift. However, the surface phonon frequency is rapidly increased with decreasing quantum dot size which originates from the constructive coupling of positive phonon dispersion and lattice contraction.

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Hwang YN, Kim SC, Park SH, Kim U, Kim D. Optical phonon modes of CdSe quantum dots in a glass matrix. 1997. Paper presented at Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim, Chiba, Jpn, .