What is it about?

In this work, we show that metallic nano-rings combined with metallic back reflectors increase the extraction efficiency of quantum light emitted by semiconductor quantum dots. We study the statistics of this effect over a large number of emitters (more than 200) randomly distributed on the chip and operating over a wavelength range of about 80 nm.

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Why is it important?

Our devices do not rely on narrowband optical cavities in fragile nano- or micro-structures, but they are broadband (the increase in brightness is observed over about 60 nm) and provide enhancement effects, allowing to collect photon fluxes reaching 7 million photons per second, with single-photon purities as high as 85%.


We believe that these results represent an important step towards the realization of scalable devices for quantum information technology applications based on single photons.

Dr Luca Sapienza
University of Glasgow

Read the Original

This page is a summary of: Broadband, efficient extraction of quantum light by a photonic device comprised of a metallic nano-ring and a gold back reflector, Applied Physics Letters, February 2022, American Institute of Physics, DOI: 10.1063/5.0082347.
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