Superradiance for atoms trapped along a photonic crystal waveguide

Abstract

We report observations of superradiance for atoms trapped in the near field of a photonic crystal waveguide (PCW). By fabricating the PCW with a band edge near the D${}_1$ transition of atomic cesium, strong interaction is achieved between trapped atoms and guided-mode photons. Following short-pulse excitation, we record the decay of guided-mode emission and find a superradiant emission rate scaling as ${\bar{\Gamma }}_{\mathrm{SR}}\propto \bar{N}\cdot {\Gamma }_{1D}$ for average atom number $0.19\lesssim \bar{N}\lesssim 2.6$ atoms, where ${\Gamma }_{1D}/{\Gamma }_0=1.1\pm 0.1$ is the peak single-atom radiative decay rate into the PCW guided mode and ${\Gamma }_0$ is the Einstein-$A$ coefficient for free space. These advances provide new tools for investigations of photon-mediated atom-atom interactions in the many-body regime.

11 pages, 10 figures

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