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

Taking advantage of the specific core-shell charge separation structure in the Cd Se ∕ Cd Te 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 phonon...

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Published in:Applied physics letters 2008-03, Vol.92 (9), p.093122-093122-3
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
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Summary:Taking advantage of the specific core-shell charge separation structure in the Cd Se ∕ Cd Te 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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2891062