Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Whispering gallery modes in photoluminescence and Raman spectra of a spherical microcavity with CdTe quantum dots: anti-Stokes emission and interference effects | Nanoscale Res Lett 2006 1 68-73 DOI s11671-006-9005-9 NANO EXPRESS Whispering gallery modes in photoluminescence and Raman spectra of a spherical microcavity with CdTe quantum dots anti-Stokes emission and interference effects Nikolai Gaponik Yury P. Rakovich Matthias Gerlach John F. Donegan Diana Savateeva Andrey L. Rogach Published online 25 July 2006 to the authors 2006 Abstract We have studied the photoluminescence and Raman spectra of a system consisting of a polystyrene latex microsphere coated by CdTe colloidal quantum dots. The cavity-induced enhancement of the Raman scattering allows the observation of Raman spectra from only a monolayer of CdTe quantum dots. Periodic structure with very narrow peaks in the photoluminescence spectra of a single microsphere was detected both in the Stokes and anti-Stokes spectral regions arising from the coupling between the emission of quantum dots and spherical cavity modes. Keywords Microcavity Nanocrystals Quantum dots Raman spectroscopy Anti-Stokes emission Introduction Spherical particles of 2-100 qm in diameter can act as three-dimensional optical resonators providing the feedback required for linear and non-linear optical N. Gaponik Physical Chemistry Electrochemistry TU Dresden 01062 Dresden Germany Y. P. Rakovich El M. Gerlach J. F. Donegan Semiconductor Photonics Group School of Physics Trinity College Dublin 2 Ireland e-mail D. Savateeva Brest State Technical University 224017 Brest Belarus A. L. Rogach Department of Physics and CeNS University of Munich 80799 Munich Germany processes such as enhanced Raman scattering 1 . Polymer latex microspheres containing semiconductor quantum dots QDs are promising candidates for the development of advanced Raman sources 2 which can extend the available range of semiconductor microlasers 3 . The combination of the high quality factor Q and the small mode volume of dielectric microspheres with the tunable emission properties of QDs has made it .
