Abstract
Abstract Semiconductor planar microcavities significantly enhance the interaction between light and matter and are thus crucial as a fundamental research platform for investigations of quantum information processing, quantum dynamics, and exciton-polariton observations. Microcavities also serve as a very agile basis for modern resonant-cavity light-emitting and detecting devices now in large-scale production for applications in sensing and communication. The fabrication of microcavity devices composed of both common materials now used in photonics and uncommon or arbitrary materials that are new to photonics offers great freedom in the exploration of the functionalities of novel microcavity device concepts. Here we propose and carefully investigate two unique microcavity designs. The first design uses a monolithic high-index-contrast grating (MHCG) and a distributed Bragg reflector (DBR) as the microcavity mirrors. The second design uses two MHCGs as the microcavity mirrors. We demonstrate by numerical analysis that MHCG-DBR and MHCG-MHCG microcavities, whose lateral radial dimension is 16 μm, reach very large quality factors at the level of 104 and nearly 106, as well as purposely designed wavelength tuning ranges of 8 and 60 nm in both configurations, respectively. Our MHCG-MHCG microcavities with a very small size of 600 nm in the vertical dimension show extremely large quality factors, which can be explained by treating the optical modes as quasi-bound states in a continuum (BICs). Moreover, we verify our theoretical analysis and calibrate our simulation parameters by comparing to the experimental characteristics of an electrically injected MHCG-DBR microcavity vertical-cavity surface-emitting laser (VCSEL) emitting at a peak wavelength of about 980 nm. We use the calibrated parameters to simulate the emission characteristics of electrically injected VCSELs in various MHCG-DBR and MHCG-MHCG microcavity configurations to illustrate the influence of microcavity designs and their quality factors on the predicted lasing properties of the devices.
Highlights
Optoelectronic devices relying on high quality factor (Q-factor) optical microcavities are increasingly important research tools in science and technology
We demonstrate by numerical analysis that monolithic high-index-contrast grating (MHCG)-distributed Bragg reflector (DBR) and MHCG-MHCG microcavities, whose lateral radial dimension is 16 μm, reach very large quality factors at the level of 104 and nearly 106, as well as purposely designed wavelength tuning ranges of 8 and 60 nm in both
The main goal of the analysis presented in this paper is to illustrate, via numerical modeling, the complex nature of planar MHCG microcavities with precise designs that facilitate very large Q-factor resonances and a broad range of resonant wavelengths induced by modification of only the MHCG parameters
Summary
Optoelectronic devices relying on high quality factor (Q-factor) optical microcavities are increasingly important research tools in science and technology. The main goal of the analysis presented in this paper is to illustrate, via numerical modeling, the complex nature of planar MHCG microcavities with precise designs that facilitate very large Q-factor resonances and a broad range of resonant wavelengths induced by modification of only the MHCG parameters. This approach enables us to analyze microcavity structures with reduced complexity in M-D and M-M configurations, highlighting the optical phenomena and illustrating the pure impact of the MHCG on the properties of the planar microcavities. We validate our numerical model by comparing our simulated and experimental results for our electrically injected M-D VCSELs emitting at 980 nm
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