Title :
Photobleaching and resonant mode shift in a microsphere-quantum dot system
Author :
Gerlach, M. ; Rakovich, Y. ; Donegan, J.F. ; Gaponik, N. ; Rogach, A.L.
Author_Institution :
Dept. of Phys., Trinity Coll., Dublin
Abstract :
Photobleaching of semiconductor quantum dots (QDs) strongly reduces the photoluminescence (PL) intensity of the emitted light generated by excitation with a pump laser beam. We investigated the photoluminescence (PL) spectrum of CdTe nanocrystals synthesised in an aqueous solution. Light emitted from the QDs is coupled into the microcavity and trapped inside by total internal reflection. The spectrum of the samples was taken with a RENISHAW micro-Raman system. A strong dependency between the shifting speed of the WGMs and the quality and quantity of the detected biomaterial could lead to a new highly sensitive biosensor application
Keywords :
II-VI semiconductors; cadmium compounds; microcavities; nanostructured materials; optical saturable absorption; photoluminescence; semiconductor quantum dots; whispering gallery modes; CdTe; RENISHAW microRaman system; biomaterial; biosensor application; internal reflection; laser beam excitation; microcavity; microsphere-quantum dot system; nanocrystal; photobleaching; photoluminescence intensity; photoluminescence spectrum; resonant mode shift; whispering gallery mode; Laser beams; Laser excitation; Laser modes; Nanocrystals; Photobleaching; Photoluminescence; Pump lasers; Quantum dot lasers; Resonance; Semiconductor lasers;
Conference_Titel :
Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on
Conference_Location :
Munich
Print_ISBN :
0-7803-8974-3
DOI :
10.1109/CLEOE.2005.1568391
