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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Efficient channeling of cesium fluorescence into guided modes of a nanofiber

Fam Le Kien, S. Dutta Gupta, V. I. Balykin, K. Hakuta

Published Jun 1, 2007• 0 citations
Publisher

Abstract

In this work, we show that efficient channeling of atomic fluorescence into guided modes can be achieved in a realistic system of a cesium atom near a nanofiber. We find that different magnetic sublevels have different decay rates. We demonstrate that the thin fiber can indeed act as an efficient subwavelength probe, since about one fourth of the spontaneous emission from the atom can be channeled into guided modes.

DOI
10.1109/cleoe-iqec.2007.4386701

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In this work, we show that efficient channeling of atomic fluorescence into guided modes can be achieved in a realistic system of a cesium atom near a nanofiber. We find that different magnetic sublevels have different decay rates. We demonstrate that the thin fiber can indeed act as an efficient subwavelength probe, since about one fourth of the spontaneous emission from the atom can be channeled into guided modes.
We study the spontaneous emission of a cesium atom in the vicinity of a subwavelength-diameter fiber. We show that the confinement of the guided modes and the degeneracy of the excited and ground states substantially affect the spontaneous emission process. We demonstrate that different magnetic sublevels have different decay rates. When the fiber radius is about 200nm200\phantom{\rule{0.3em}{0ex}}\mathrm{nm}200nm, a significant fraction (up to 28%) of spontaneous emission by the atom can be channeled into guided modes. Our results may find applications for developing nanoprobes for atoms and efficient couplers for subwavelength-diameter fibers.
Abstract We discuss how optical nanofibers, subwavelength-diameter fibers, can open new perspectives in quantum optical technologies theoretically and experimentally. Discussions are mainly focused on the manipulation of spontaneous emission for atoms around the nanofiber. We show that photons from single quantum emitters can be efficiently channeled into guided modes of the nanofiber. Especially by fabricating a cavity structure of the nanofiber, the channeling efficiency can be improved to exceed 80% although the cavity finesse is moderate. We discuss also how to realize such a nanofiber cavity experimentally.