Title: Resonance-enhanced dipolar interaction between terahertz photons and confined acoustic phonons in nanocrystals
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
Department of Photonics
Issue Date: 3-Mar-2008
Abstract: 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 D(4) dependence, supporting a charged simple-harmonic-oscillator model. These facts verify the occurrence of dipolar interaction between terahertz photons and confined terahertz acoustic phonons. (c) 2008 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2891062
ISSN: 0003-6951
DOI: 10.1063/1.2891062
Volume: 92
Issue: 9
End Page: 
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