Position dependent optical coupling between single quantum dots and photonic crystal nanocavities

Journal Article · Mon Aug 15 04:00:00 UTC 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4961389· OSTI ID:22590510

Kuruma, K.; Takamiya, D. ^[1]; Ota, Y.; Kakuda, M. ^[2]; Iwamoto, S.; Arakawa, Y. ^[1]

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1. Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)
2. Institute of Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505 (Japan)

We demonstrate precise and quick detection of the positions of quantum dots (QDs) embedded in two-dimensional photonic crystal nanocavities. We apply this technique to investigate the QD position dependence of the optical coupling between the QD and the nanocavity. We use a scanning electron microscope (SEM) operating at a low acceleration voltage to detect surface bumps induced by the QDs buried underneath. This enables QD detection with a sub-10 nm precision. We then experimentally measure the vacuum Rabi spectra to extract the optical coupling strengths (gs) between single QDs and cavities, and compare them to the values estimated by a combination of the SEM-measured QD positions and electromagnetic cavity field simulations. We found a highly linear relationship between the local cavity field intensities and the QD-cavity gs, suggesting the validity of the point dipole approximation used in the estimation of the gs. The estimation using SEM has a small standard deviation of ±6.2%, which potentially enables the high accuracy prediction of g prior to optical measurements. Our technique will play a key role for deeply understanding the interaction between QDs and photonic nanostructures and for advancing QD-based cavity quantum electrodynamics.

• OSTI ID: 22590510
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 7 Vol. 109; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
APPROXIMATIONS
CRYSTALS
ELECTRIC POTENTIAL
ELECTRON SCANNING
QUANTUM DOTS
QUANTUM ELECTRODYNAMICS
SCANNING ELECTRON MICROSCOPY
SPACE DEPENDENCE
TWO-DIMENSIONAL SYSTEMS