Abstract
We report on the realization of a dense, large-scale array of 900 quantum dot micropillar cavities with high spectral homogeneity. We target applications in photonic information processing such as optical reservoir computing which can be implemented in large arrays of optically coupled microlasers. To achieve the required spectral homogeneity for the underlying optical injection locking, we calculate and set the diameter of each individual micropillar within the array during the fabrication process by taking the diameter-dependent emission wavelength of the microcavities into account. Using this kind of diameter adjustment, we improve the overall wavelength homogeneity in a 30 × 30 micropillar array by 64% and reduce the standard deviation of the resonance energy distribution by 26% from 352 μeV in the planar unprocessed sample to 262 μeV in the fabricated array. In addition, we present a detailed analysis of the device quality and the diameter control of the micropillar’s emission wavelength, which includes important information for the effective application of the developed fabrication method for the realization of highly homogeneous micropillar arrays in the future.
Highlights
The development of high-quality quantum dot (QD) micropillar cavities has enabled numerous studies and advances in the field of cavity-enhanced nanophotonic devices
The study of externally controlled QD-microlasers has led to unconventional effects such as partial injection locking in the field of nonlinear laser dynamics.[7,8]
We report on the application of diameter-tuning to realize large arrays of hundreds of quantum dot micropillars with high spectral homogeneity
Summary
The development of high-quality quantum dot (QD) micropillar cavities has enabled numerous studies and advances in the field of cavity-enhanced nanophotonic devices. The spectral alignment of a large-scale network of micropillars has to be ensured already in the cavity design and fabrication process of the array, for example, by adjusting the resonance wavelength of each micropillar via its diameter Such “diameter-tuning” of the resonance wavelength has already been applied for individual deterministically fabricated single-QD-micropillars.[4,18] In this work, we report on the application of diameter-tuning to realize large arrays of hundreds of quantum dot micropillars with high spectral homogeneity. For this purpose, we individually tailor the resonance wavelength of single micropillars to compensate for spectral inhomogeneities of the unprocessed planar microcavity. Such homogeneity facilitates the interaction between the individual lasers of such arrays and allows them to form a network that can be optically injectionlocked by using an external laser.[11]
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