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Conference on Lasers and Electro-Optics

Chip-Based Optical Interactions with Rubidium Vapor

Pablo Londero, Jacob S. Levy, Aaron D. Slepkov, Amar R. Bhagwat, Kasturi Saha, Vivek Venkataraman, Michal F. Lipson, Alexander L. Gaeta

Published Jan 1, 2010• 4 citations
Publisher

Abstract

We demonstrate tightly confined interactions with Rb atoms on a chip of silicon nitride nanowires. Optical depths of 2 are observed, and absorption spectroscopy reveals strong effects of transit-time broadening and Van der Waals shifts.
DOI
10.1364/qels.2010.qfe4

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We demonstrate a method for measuring atom-surface interactions using transmission spectroscopy of thermal vapors confined in a wedged nanocell. The wedged shape of the cell allows complementary measurements of both the bulk atomic vapor and atoms close to surfaces experiencing strong van der Waals atom-surface interaction. These are used to tightly constrain the dipole-dipole collisional parameters of a theoretical model for transmission spectra that accounts for atom-surface interactions, cavity effects, collisions with the surface of the cell, and atomic motion. We illustrate this method on a cesium vapor in a sapphire cell, demonstrating that even the weakest of the van der Waals atom-surface interaction coefficients---for ground-state alkali atom transitions---can be determined with a very good precision. This result paves the way towards a precise quantitative characterization of atom-surface interactions in a wide range of atom-based nanodevices.