2023 Fiscal Year Research-status Report
Fiber-integrated diamond-based whispering-gallery-mode magnetometers
| Project/Area Number |
23K04617
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| Research Institution | Okinawa Institute of Science and Technology Graduate University |
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Principal Investigator |
LI SHILONG 沖縄科学技術大学院大学, 量子技術のための光・物質相互作用ユニット, 客員研究員 (60910403)
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| Project Period (FY) |
2023-04-01 – 2026-03-31
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| Keywords | Nanofiber / Microcavity / NV- center / Magnetometer |
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| Outline of Annual Research Achievements |
This project aims to establish a nanofiber-based whispering-gallery-mode (WGM) microcavity-enhanced magnetometer integrated with single negatively charged nitrogen-vacancy (NV-) centers. During the first fiscal year, we obtained the necessary equipment and laboratory consumables to build individual components that finally constituted the proposed magnetometer.
1. Fabrication of the nanofiber and the WGM microcavity was completed.
2. Recipe to clean and functionalize NV- nanodiamonds for better isolation and good signal-to-noise ratio was developed.
3. All the components to build the all-fiber magnetometer as proposed were assembled.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
1. Optical nanofibers and hollow-core WGM microcavities with the desired parameters were fabricated and characterized using scanning electron microscopy and X-ray photogrammetry.
2. Nanodiamonds containing single NV- centers were isolated from graphite-covered diamond powder. Presence of single NV- centers was confirmed by second-order correlation measurements.
3. On-demand coupling of single NV- nanodiamonds to the optical nanofiber was performed by means of a pick-and-drop method with ~200-nm tungsten probes.
4. Assembly of the proposed magnetometer system was completed which consists of a single NV- nanodiamond, an optical nanofiber, and a hollow-core WGM microcavity. Zero-field optically detected magnetic field resonance signal with a contrast of 12% was achieved.
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| Strategy for Future Research Activity |
1. Modeling of field interactions in the proposed multiphysical magnetometer system will be done.
2. Optimization of the photon coupling efficiency between different optical components will be done.
3. The performance of the detected magnetic field resonance of the magnetometer will be optimized.
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Research Products
(5 results)
