Abstract
We present a statistical study of the Purcell enhancement of the light emission from quantum dots coupled to Anderson-localized cavities formed in disordered photonic-crystal waveguides. We measure the time-resolved light emission from both single quantum emitters coupled to Anderson-localized cavities and directly from the cavities that are fed by multiple quantum dots. Strongly inhibited and enhanced decay rates are observed relative to the rate of spontaneous emission in a homogeneous medium. From a statistical analysis, we report an average Purcell factor of 4.5 ± 0.4 without applying any spectral tuning. By spectrally tuning individual quantum dots into resonance with Anderson-localized modes, a maximum Purcell factor of 23.8 ± 1.5 is recorded, which is at the onset of the strong-coupling regime. Our data quantify the potential of Anderson-localized cavities for controlling and enhancing the light-matter interaction strength in a photonic-crystal waveguide, which is of relevance for cavity quantum-electrodynamics experiments, efficient energy harvesting and random lasing.
Highlights
The local environment of a quantum emitter determines its spectral and spatial emission properties
We present statistical measurements of the decay dynamics of both single quantum dots tuned to resonance with Anderson-localized modes and for the case where no control over the quantum dot - cavity detuning is implemented
In the following we present the experimental data of the spontaneous emission dynamics recorded when collecting light from the Anderson-localized cavities
Summary
The local environment of a quantum emitter determines its spectral and spatial emission properties. Disorder induces random multiple scattering of light that removes van Hove singularities and may create randomly localized modes by Anderson localization [12, 13] that approximately inherit the polarization properties of the fully periodic waveguide as seen in Fig. 1c and 1d Due to their random nature, a statistical analysis is required to extract the spectral and spatial properties of Anderson-localized modes. In the first presented data set we measure the decay dynamics of the Andersonlocalized modes and extract the fastest rate of the multi-exponential decay curves This procedure records the rate of the quantum dot that is best coupled to this particular Anderson-localized mode while the detuning between the emitter and the cavity is not optimized. We evaluate the light-matter interaction strength and compare the experimental data to the theoretically predicted distributions illustrating that the best cavities are at the onset of the strong-coupling regime
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