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High efficiency silicon nanodisk laser based on colloidal CdSe/ZnS QDs.

Yao-Chen Wang¹, Chi-Tsu Yuan, Yi-Chun Yang

¹Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei, Taiwan.

|November 24, 2011

Summary

Researchers developed a room-temperature nanodisk laser using quantum dots (QDs) in a silicon cavity, achieving ultra-low threshold power. This breakthrough in quantum dot lasers offers high efficiency and enhanced spontaneous emission rates.

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Area of Science:

Optoelectronics
Nanotechnology
Materials Science

Background:

Development of visible wavelength nanodisk lasers utilizing colloidal cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots (QDs).
Integration of QDs within submicron-sized silicon disk cavities for laser fabrication.

Purpose of the Study:

To demonstrate a room-temperature nanodisk laser with extremely low threshold power.
To investigate the efficiency and spontaneous emission (SE) rates in QD-based nanodisk lasers.

Main Methods:

Fabrication of nanodisks using electron-beam lithography.
Characterization of quantum dot properties using time-resolved photoluminescence (PL).

Main Results:

Observation of lasing action at 594 nm wavelength from QDs on a 750 nm diameter nanodisk cavity.

Keywords:

nanodisk nanolaser quantum dot spontaneous emission whispering galley mode

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Achieved an ultra-low threshold power of 2.8 µW for the nanodisk laser.

Demonstrated a nearly sevenfold increase in spontaneous emission (SE) rate through QD concentration studies.

Conclusions:

High efficiency and SE coupling rates were achieved in the developed QD nanodisk laser.
The study highlights the potential of QD-silicon nanodisk systems for low-threshold laser applications.