AI Article Synopsis
- Whispering gallery mode (WGM) microlasers are becoming popular in nanophotonics for applications like biosensing and quantum dot excitation.
- The study investigates how the diameter of quantum dot micropillar cavities (ranging from 1 to 20 µm) affects various lasing properties (like lasing threshold and quality factor) at low temperatures.
- Findings reveal that the diameter significantly influences lasing behavior, and imperfections in growth and fabrication lead to variations in performance, offering valuable insights for future optoelectronic applications.
Article Abstract
Whispering gallery mode (WGM) based microlasers have gained significant interest across various fields of nanophotonics, including biosensing, metrology, and on-chip excitation of single quantum dots in integrated quantum photonic structures. In this study, we report a comprehensive diameter-dependent study of whispering gallery mode lasing in quantum dot micropillar cavities. The lasing threshold, mode energy, quality factor, light-matter interaction in terms of the Purcell factor, and the free spectral range, are studied systematically for diameters ranging from 1 to 20 µm at cryogenic temperatures. To describe the experimental data, we use rate equation fitting and numerical simulations based on the finite element method, including realistic loss channels. Our results show a strong and systematic dependence of all lasing properties on the diameter of the micropillars. We also observe significant variations in the lasing properties of nominally identical micropillars, indicating a significant influence of the growth and fabrication imperfections on the output of the devices. The study provides important information on the optical properties of micropillar-based WGM lasing, which can aid in the advancement of optoelectronic applications using these nanophotonic structures.
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| http://dx.doi.org/10.1364/OE.529679 | DOI Listing |
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