Controlling the emission from semiconductor quantum dots using ultra-small tunable optical microcavities

Abstract

We report the control of spontaneous emission from CdSe/ZnS core-shell quantum dots coupled to novel open-access optical microcavities. The cavities are fabricated by focused ion beam milling, and provide mode volumes less than a cubic micrometre. The quantum dot emission spectrum, spatial modes, and lifetime are all modified substantially by the presence of the cavity, and can be tuned by actively varying the cavity length. An increase in emission rate of 75% is achieved at room temperature, attributed to the Purcell effect in the 'bad emitter' regime. We demonstrate a high degree of control over the emission from the dots, including near single-mode operation and the ability to detect strong emission from individual nanocrystals.

References in corpus (4)

• Quantum nature of a strongly-coupled single quantum dot-cavity system
• Fiber Fabry-Perot cavity with high finesse
• Prospects for measurement-based quantum computing with solid state spins
• A stable fiber-based Fabry-Perot cavity

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• Fabrication of Customized, Low-Loss Optical Resonators by Combination of FIB-Milling and CO${}_2$ Laser Ablation
• A Low-Temperature Tunable Microcavity featuring High Passive Stability and Microwave Integration
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