Resonance-enhanced dipolar interaction between terahertz photons and confined acoustic phonons in nanocrystals

Taking advantage of the specific core-shell charge separation structure in the CdSe∕CdTe core-shell type-II nanocrystals, we experimentally observed and verified the existence of the resonance-enhanced dipolar interaction between terahertz photons and their corresponding confined acoustic phonons. F...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2008-03, Vol.92 (9)
Main Authors: Liu, Tzu-Ming, Lu, Ja-Yu, Chen, Hung-Ping, Kuo, Chung-Chiu, Yang, Meng-Ju, Lai, Chih-Wei, Chou, Pi-Tai, Chang, Ming-Hao, Liu, Hsiang-Lin, Li, Yu-Tai, Pan, Ci-Ling, Lin, Shih-Hung, Kuan, Chieh-Hsiung, Sun, Chi-Kuang
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Taking advantage of the specific core-shell charge separation structure in the CdSe∕CdTe core-shell type-II nanocrystals, we experimentally observed and verified the existence of the resonance-enhanced dipolar interaction between terahertz photons and their corresponding confined acoustic phonons. From the measured terahertz transmission spectra, we found that the photon frequency of the terahertz resonant absorption is inversely proportional to the diameter D of the nanocrystals and agrees with that of dipolar active l=1, n=0 confined acoustic modes. The corresponding absorption cross section shows a D4 dependence, supporting a charged simple-harmonic-oscillator model. These facts verify the occurrence of dipolar interaction between terahertz photons and confined terahertz acoustic phonons.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2891062