Multi-color laser excitation of diamond nitrogen vacancy centers embedded in nanophotonic structures
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2021-06-01 |
| Journal | AIP Advances |
| Authors | Axel Hochstetter, Elke Neu |
| Institutions | University of Kaiserslautern |
| Citations | 4 |
Abstract
Section titled āAbstractāNegatively charged nitrogen vacancy centers (NVā) in diamond serve as highly sensitive, optically readable sensors for magnetic fields. Improved sensing approaches rely on NVā centers embedded in diamond nanopillar waveguides, which enable scanning probe imaging and use multi-color laser schemes for efficient spin readout. In this work, we investigate the free-beam coupling of the most relevant laser wavelengths to diamond nanopillars with different geometries. We focus on cylindrical pillars, conical pillars, and conical pillars with an added parabolic dome. We study the effects of the pillar geometry, NVā position, laser wavelength, position of laser focus, and excitation geometry (excitation from the top facet or from the substrate side). We find a pronounced impact of the laser wavelength that should be considered in multi-color excitation of NVā. Within the pillars, exciting laser fields can be enhanced up to a factor of 11.12 compared to bulk. When focusing the laser to the interface between the substrate and the nanopillar, even up to 29.78-fold enhancement is possible. Our results are in accordance with the experimental findings for green laser excitation of NVā in different pillar geometries.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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