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arXiv:2206.13029 · Physical Review Applied

Bright and Polarized Fiber In-Line Single-Photon Source Based on Plasmon-Enhanced Emission into Nanofiber Guided Modes

K. Muhammed Shafi, Ramachandrarao Yalla, K. P. Nayak

Published Mar 2, 2023• 21 citations
arXivHTMLPDF

Abstract

We demonstrate a bright and polarized fiber in-line single-photon source based on plasmon-enhanced emission of colloidal single quantum dots into an optical nanofiber. We show that emission properties of single quantum dots can be strongly enhanced in the presence of single gold nanorods leading to a bright and strongly polarized single-photon emission. The single photons are efficiently coupled to guided modes of the nanofiber and eventually to a single-mode optical fiber. The brightness (fiber-coupled photon count rate) of the single-photon source is estimated to be $12.2\ifmmode\pm\else\textpm\fi{}0.6$ MHz, with high single-photon purity [${g}^{2}(0)=0.20\ifmmode\pm\else\textpm\fi{}0.04$] and degree of polarization as high as 94--97 %. The polarized and fiber-coupled single photons can be implemented for potential applications in quantum photonics.

DOI
10.1103/physrevapplied.19.034008

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We experimentally demonstrate the efficient channeling of fluorescence photons from single q dots on optical nanofiber into the guided modes by measuring the photon-count rates through the guided and radiation modes simultaneously. We obtain the maximum channeling efficiency to be 22.0(±4.8)% at a fiber diameter of 350 nm for the emission wavelength of 780 nm. The results may open new possibilities in quantum information technologies for generating single photons into single-mode optical fibers.
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