Millimeter wave absorption by confined acoustic modes in CdSe/CdTe core-shell quantum dots

T.-M. Liu , J.-Y. Lu , C.-C. Kuo , Y.-C. Wen , C.-W. Lai , M.-J. Yang , P.-T. Chou , Lucien Saviot (1) , C.-K. Sun , D. B. Murray (2)

1 ICB - Laboratoire Interdisciplinaire Carnot de Bourgogne
2 Mathematics, Statistics and Physics Unit

Taking advantage of the specific core-shell charge separation structure in the CdSe/CdTe core-shell Type-II quantum dots (QDs), we experimentally observed the resonant-enhanced dipolar interaction between millimeter-wave (MMW) photons and their corresponding (l = 1) confined acoustic phonons. With proper choice of size, the absorption band can be tuned to desired frequency of MMW imaging. Exploiting this characteristic absorption, in a fiber-scanned MMW imaging system, we demonstrated the feasibility of CdSe/CdTe QDs as the contrast agents of MMW imaging.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

T.-M. Liu, J.-Y. Lu, C.-C. Kuo, Y.-C. Wen, C.-W. Lai, et al.. Millimeter wave absorption by confined acoustic modes in CdSe/CdTe core-shell quantum dots. Journal of Physics: Conference Series, 2007, 92, pp.012039. ⟨10.1088/1742-6596/92/1/012039⟩. ⟨hal-00394321⟩