Surface-passivated high-Q GaAs photonic crystal nanocavity with quantum dots
| Autor: | Yasutomo Ota, Yasuhiko Arakawa, Masahiro Kakuda, Satoshi Iwamoto, Kazuhiro Kuruma |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Applied optics. Photonics
Quantum Physics Materials science Passivation Computer Networks and Communications business.industry Cavity quantum electrodynamics Nanophotonics lcsh:TA1501-1820 Physics::Optics FOS: Physical sciences Physics - Applied Physics Applied Physics (physics.app-ph) Atomic and Molecular Physics and Optics Light scattering Quantum dot Q factor Optoelectronics Photonics business Quantum Physics (quant-ph) Photonic crystal |
| Zdroj: | APL Photonics, Vol 5, Iss 4, Pp 046106-046106-8 (2020) |
| DOI: | 10.48550/arxiv.2001.02377 |
| Popis: | Photonic crystal (PhC) nanocavities with high quality (Q) factors have attracted much attention because of their strong spatial and temporal light confinement capability. The resulting enhanced light-matter interactions are beneficial for diverse photonic applications, ranging from on-chip optical communications to sensing. However, currently achievable Q factors for active PhC nanocavities, which embed active emitters inside, are much lower than those of the passive structures because of large optical loss, presumably originating from light scattering by structural imperfections and/or optical absorptions. Here, we demonstrate a significant improvement of Q factors up to ~160,000 in GaAs active PhC nanocavities using a sulfur-based surface passivation technique. This value is the highest ever reported for any active PhC nanocavities with semiconductor quantum dots. The surface-passivated cavities also exhibit reduced variation in both Q factors and cavity resonant wavelengths. We find that the improvement in the cavity performance presumably arises from suppressed light absorption at the surface of the PhC's host material by performing a set of PL measurements in spectral and time domains. With the surface passivation technique, we also demonstrate a strongly-coupled single quantum dot-cavity system based on a PhC nanocavity with a high Q factor of ~100,000. These results will pave the way for advanced quantum dot-based cavity quantum electrodynamics and for GaAs micro/nanophotonic applications containing active emitters. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|