Abstract
In a chip-based waveguide, the confined nature of the optical field and proximity of the waveguide's surface must not be ignored. The short transit time of warm atoms through highly confined light fields can strongly influence the observed atomic absorption spectra. Most theoretical studies have focused on fields with Gaussian intensity profiles, but is that realistic? Here the authors model the transit-time-limited interaction between atomic gas and an exponentially decaying evanescent field, and find spectral lineshapes unlike those for a Gaussian field. These simulations compare well to experiments on Rb vapor and the evanescent guided modes of an exposed-core optical fiber.
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