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Wavelength tunable triggered single-photon source from a single CdTe quantum dot on silicon substrate.

Mohamed Benyoucef¹, Hong Seok Lee, Juliane Gabel

¹Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstrasse 20, D-01069 Dresden, Germany. m.benyoucef@ifw-dresden.de

|December 11, 2008

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Single-photon emission from cadmium telluride quantum dots (QDs) on silicon is demonstrated. Their emission wavelength is tunable with lasers, maintaining high single-photon purity and stable lifetimes.

Area of Science:

Solid-state physics
Quantum optics
Materials science

Background:

Single-photon sources are crucial for quantum technologies.
Quantum dots (QDs) offer tunable optical properties.
Integration of QDs with silicon platforms is highly desirable.

Purpose of the Study:

To demonstrate triggered single-photon emission from single cadmium telluride (CdTe) quantum dots (QDs) grown on a silicon (Si(001)) substrate.
To investigate the tunability of the emission wavelength and its effect on single-photon purity.
To assess the stability of QD properties after laser processing.

Main Methods:

Growth of CdTe QDs on Si(001) substrates.
Characterization of optical properties using photoluminescence spectroscopy.

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Measurement of single-photon emission using a Hanbury Brown and Twiss interferometer.

Wavelength tuning via focused laser excitation.

Lifetime measurements before and after laser processing.

Main Results:

First demonstration of triggered single-photon emission from single CdTe QDs on Si(001).
Emission wavelength tuning over a range exceeding 8 meV achieved using a focused laser.
Preservation of high single-photon purity from exciton emission after wavelength tuning.
No significant change in exciton lifetime observed after laser processing.

Conclusions:

CdTe QDs on Si(001) are a viable platform for tunable single-photon sources.
Laser-induced wavelength tuning is a promising method for controlling emission properties.
The demonstrated QD system exhibits robust single-photon emission characteristics suitable for quantum applications.