Observation of the $^{87}$Rb $5S_{1/2}$ to $4D_{3/2}$ electric quadrupole transition at 516.6 nm mediated via an optical nanofibre

• URL: http://arxiv.org/abs/2002.01658v1
• Date: Wed, 5 Feb 2020 06:35:25 GMT
• Title: Observation of the $^{87}$Rb $5S_{1/2}$ to $4D_{3/2}$ electric quadrupole transition at 516.6 nm mediated via an optical nanofibre
• Authors: Tridib Ray, Ratnesh K. Gupta, Vandna Gokhroo, Jesse L. Everett, Thomas Nieddu, Krishnapriya S. Rajasree and S\'ile Nic Chormaic
• Abstract summary: Light guided by an optical nanofibre can have a very steep evanescent field gradient extending from the fibre surface. This can be exploited to drive electric quadrupole transitions in nearby quantum emitters. We report on the observation of the $5S_1/2$ $rightarrow$ $4D_3/2$ electric quadrupole transition at 516.6 nm in laser-cooled $87$Rb atoms.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Light guided by an optical nanofibre can have a very steep evanescent field gradient extending from the fibre surface. This can be exploited to drive electric quadrupole transitions in nearby quantum emitters. In this paper, we report on the observation of the $5S_{1/2}$ $\rightarrow$ $4D_{3/2}$ electric quadrupole transition at 516.6 nm (in vacuum) in laser-cooled $^{87}$Rb atoms using only a few $\mu$W of laser power propagating through an optical nanofibre embedded in the atom cloud. This work extends the range of applications for optical nanofibres in atomic physics to include more fundamental tests.

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