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The interaction of excitonic transitions with confined photonic modes enablestests of quantum physics and design of efficient optoelectronic devices. Herewe study how key metrics such as Purcell factor, beta-factor and collectionefficiency are determined by the non-cavity modes which exist in real devices,taking the well-studied micropillar cavity as an example. Samples with dots atdifferent positions in the cavity field allow us to quantify the effect of thenon-cavity modes and show that the zero-phonon line and the phonon-assistedemission into the cavity mode HE11 is suppressed by positioning dots at thefield node.

Probing Purcell enhancement and photon collection efficiency of InAs quantum dots at nodes of the cavity electric field