Dresden 2014 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session DF
DF 9.5: Poster
Dienstag, 1. April 2014, 18:30–20:00, P1
Quantum dots and lanthanides as cw-emitters in polymeric microresonators — •Carolin Klusmann1, Sarah Wiegele1, Tobias Siegele1, Tobias Wienhold2, Sebastian Köber2,3, and Christian Koos2,3 — 1Institute of Applied Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2Institute of Microstructure Technology, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 3Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
Polymeric whispering gallery mode (WGM) microresonators are considered to be very auspicious candidates for the label-free detection and characterization of individual nanoscale objects due to their high quality factor and small modal volume. So far, we utilized laser dyes embedded in a polymeric host matrix as active medium for the resonators. However, resonators doped with dyes should be operated with pulsed excitation sources to reduce bleaching effects. Thus, we are looking into emitters which allow the use of a continuous pump source. Quantum dots are considered to be promising candidates for this approach due to their high quantum yield, narrow and tunable emission in combination with broad absorption spectra, higher stability and lower photobleaching rates compared to organic fluorophores. Furthermore, lanthanides with fluorescence stemming from atomic transitions are appropriate emitters for our application because of their high photostability, sharp emission profile and large Stokes Shift. Using cw-emitters as active medium opens the possibility to observe mode-splitting by using a heterodyne detection system.