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

fYear

2005

fDate

17-17 June 2005

Firstpage

615

Lastpage

615

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Lasers and Electro-Optics Europe, 2005. CLEO/Europe. 2005 Conference on

Conference_Location

Munich

Print_ISBN

0-7803-8974-3

Type

conf

DOI

10.1109/CLEOE.2005.1568391

Filename

1568391