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Updated: Jun 22, 2026

Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation

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High performance single photon sources from photolithographically defined pillar microcavities.

A Bennett, D Unitt, P Atkinson

|June 3, 2009

Summary

We achieved efficient single-photon generation from quantum dots within microcavities. This method significantly reduces multi-photon emission, enhancing single-photon purity for quantum applications.

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Area of Science:

Quantum optics
Solid-state physics
Nanotechnology

Background:

Quantum dots are promising sources for single photons.
Microcavities can enhance light-matter interactions.

Purpose of the Study:

To demonstrate single-photon generation from InAs/GaAs quantum dots in pillar microcavities.
To investigate the Purcell effect and photon collection efficiency.

Main Methods:

Fabrication of photolithographically defined pillar microcavities.
Utilizing single InAs/GaAs quantum dots as photon emitters.
Measuring radiative decay rate enhancement and photon collection efficiency.
Analyzing second-order correlation functions to assess multi-photon emission.

Main Results:

Achieved single-photon generation from quantum dots in microcavities.
Observed a four-fold enhancement in radiative decay rate (Purcell effect).
Reached up to 10% photon collection efficiency into a lens.
Demonstrated a >50-fold reduction in multi-photon emission rate.

Conclusions:

Pillar microcavities significantly enhance single-photon emission from quantum dots.
The demonstrated system offers high single-photon purity and collection efficiency.
This work is crucial for developing quantum information processing technologies.