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$Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction$

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Quantum dot microdrop laser.

J Schäfer¹, J P Mondia, R Sharma

¹Institute of Optics, Information and Photonics, Max-Planck Research Group, University of Erlangen-Nuremberg, Erlangen, Germany.

|May 13, 2008

Summary

We achieved efficient lasing in liquid microcavities using quantum dots. This breakthrough requires significantly lower quantum dot densities than previously thought possible.

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Area of Science:

Materials Science
Optics
Nanotechnology

Background:

Quantum dots (QDs) are crucial for optoelectronic devices.
Liquid microcavities offer unique optical properties for light manipulation.

Purpose of the Study:

To investigate lasing in liquid microcavities containing CdSe/ZnS nanocrystal quantum dots.
To explore the threshold requirements for lasing in such systems.

Main Methods:

Electrodynamic levitation of charged liquid microdroplets (10-40 microm).
Optical pumping of microcavities containing CdSe/ZnS quantum dots.
Measurement of directional laser emission.

Main Results:

Achieved single-mode and multimode lasing from isolated spherical liquid microcavities.
Observed lasing at QD densities over two orders of magnitude lower than predicted.
Measured substantial laser signals at low thresholds due to high Q-factor cavity modes.

Conclusions:

Demonstrated a novel and highly efficient method for achieving lasing in quantum dot-based microcavities.
The findings challenge existing theoretical models for QD lasing thresholds.
Highlights the potential of liquid microcavities for advanced photonic applications.