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By using CdSe/ZnS quantum dots(QDs),we study the effect of cavity quantum electrodynamics on the coupling of the microtoroid cavity.When with whispering gallery(WG) modes,the microtoroid cavity demonstrates high quality factor and small mode volume at visible wavelengths.Accordingly,fiber tapers allow QDs to adhere into the cavity and further permit the control of site-selected coupling.From the luminescence spectra,QDs are modulated effectively by cavity modes.Variable modulations are observed by changing QD coupling conditions.Therefore,based on experimental and theoretical research,strong and tunable Purcell enhancement can be realized by this system.
By using CdSe / ZnS quantum dots (QDs), we study the effect of cavity quantum electrodynamics on the coupling of the microtoroid cavity. With whispering gallery (WG) modes, the microtoroid cavity demonstrates high quality factor and small mode volume for wavelength .Accordingly, fiber tapers allow QDs to adhere into the cavity and further permit the control of site-selected coupling. From the luminescence spectra, QDs are modulated effectively by cavity modes.Variable modulations are observed by changing QD coupling conditions. Before, based on experimental and theoretical research, strong and tunable Purcell enhancement can be realized by this system.