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

Tzu Ming Liu, Ja Yu Lu, Hung Ping Chen, Chung Chiu Kuo, Meng Ju Yang, Chih Wei Lai, Pi Tai Chou, Ming Hao Chang, Hsiang Lin Liu, Yu Tai Li, Ci Ling Pan, Shih Hung Lin, Chieh Hsiung Kuan, Chi Kuang Sun

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    13 Citations (Scopus)

    Abstract

    Taking advantage of the specific core-shell charge separation structure in the CdSeCdTe 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.

    Original languageEnglish
    Article number093122
    JournalApplied Physics Letters
    Volume92
    Issue number9
    DOIs
    Publication statusPublished - 2008 Mar 14

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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