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Collective Mode Interferences in Light--Matter Interactions
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abstract
We present a theoretical and experimental analysis of transient optical properties of a dense cold atomic gas. After the rapid extinction of a weak coherent driving field (mean photon number $\sim 1.5$), a transient `flash' is observed. Surprisingly the decay of the `flash' is faster than the decay of the fastest superradiant mode of the system. We show that this `faster than superradiance decay' is expected due to the interference between collective eigenmodes that exhibit a range of frequency shifts away from the bare atomic transition. Experimental results confirm that the initial decay rate of the superradiant flash increases with optical depth, in agreement with the numerical simulations for the experimental conditions.
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Cited by 1 Pith paper
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Subradiance-protected excitation spreading in the generation of collimated photon emission from an atomic array
A localized single-photon excitation in a 2D atomic array can be converted, via a subradiant collective mode, into a highly collimated photon beam.
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