Resonance-enhanced dipolar interaction between terahertz photons and confined acoustic phonons in nanocrystals
Journal
Applied Physics Letters
Journal Volume
92
Journal Issue
9
Date Issued
2008
Author(s)
Liu, T.-M.
CHIEH-HSIUNG KUAN
Lin, Shih-Hung
Chang, Ming-Hao
Lai, Chih-Wei
Yang, Meng-Ju
Kuo, Chung-Chiu
Chen, Hung-Ping
Lu, Ja-Yu
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. © 2008 American Institute of Physics.
Other Subjects
Absorption; Crystal structure; Phonons; Photons; Acoustic phonons; Resonance-enhanced dipolar interaction; Terahertz photons; Terahertz transmission spectra; Nanocrystals
Type
journal article