Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Applied Physics Letters

Fiber-integrated diamond-based magnetometer

Xiaodi Liu, Jin‐Ming Cui, Fang‐Wen Sun, Xuerui Song, Fupan Feng, Junfeng Wang, Wei Zhu, Liren Lou, Guanzhong Wang

Published Sep 30, 2013• 55 citations
Publisher

Abstract

We demonstrated a fiber-integrated diamond-based magnetometer in this paper. In the system, the fluorescence of nitrogen vacancy (NV) centers in nanodiamonds deposited on a tapered fiber was coupled to the tapered fiber effectively and detected at the output end of the fiber. By using this scheme, optically detected electron spin resonance spectra were recorded for single NV centers. The results confirmed that such a tapered fiber-nanodiamond system can act as a magnetometer. Featured with excellent portability, convenient fabrication, and potential for further integration, the constructed system has been demonstrated to be a practical magnetometer prototype.

DOI
10.1063/1.4823548

Related papers

Optical fibers doped with nitrogen-vacancy submicron diamonds as magnetic sensors

Mariusz Mrózek, Adam Filipkowski, Grzegorz Stępniewski +4 more

Coupling NV-rich diamond with optical fibers opens the door to guiding quantum information via the NV center's spin state. While diamond-functionalized fiber sensors have shown excellent sensitivity to localized magnetic fields, their distributed sensing capabilities have been untapped. By embedding diamonds throughout the fiber's core, we create a sensor sensitive to magnetic fields along its entire length. This theoretically allows for distributed optical readout of small magnetic fields. However, challenges remain in pinpointing the source's location and understanding the performance of a sensor where the NV-center fluorescence is detected at a single endpoint, integrating signals from color centers in varying field and microwave conditions. We present a demonstration of distributed magnetic field sensing using a step-index fiber with NV-rich diamonds incorporated throughout the core. By collecting the NV fluorescence at the fiber's output and recording Optically Detected Magnetic Resonance (ODMR) spectra as the excitation source moves, we can map the magnetic field profile along the fiber, accurately locating the field source. This straightforward sensor design holds promise for applications such as magnetic field mapping of integrated circuits in photonics and spintronics.

Workshop on Specialty Optical Fibers and Their Applications (WSOF)•May 29, 2025•0 citations

Magnetically sensitive fiber probe with nitrogen-vacancy center nanodiamonds integrated in a suspended core

Adam Filipkowski, Mariusz Mrózek, Grzegorz Stępniewski +6 more

Efficient collection of photoluminescence arising from spin dynamics of nitrogen vacancy (NV) centers in diamond is important for practical applications involving precise magnetic field or temperature mapping. These goals may be realized by the integration of nanodiamond particles with optical fibers and volumetric doping of the particles alongside the fiber core. That approach combines the advantages of robust axial fixation of NV diamonds with a direct spatial overlap of their fluorescence with the guided mode of the fiber. We developed a suspended core silicate glass fiber with 750 nm-diameter nanodiamonds located centrally in the 1.5 µm-core cross-section along its axis. The developed fiber probe was tested for its magnetic sensing performance in optically detected magnetic resonance measurements using a 24 cm-long fiber sample, with the NV excitation and fluorescence collection from the far ends of the sample and yielding optical readout contrast of 7% resulting in 0.5 µT·Hz-1/2 magnetic field sensitivity, two orders of magnitude better than in earlier designs. Thanks to its improved fluorescence confinement, the developed probe could find application in magnetic sensing over extended fiber length, magnetic field mapping or gradiometry.

Optics Express•May 3, 2022•20 citations

Fiber-optic magnetometry with randomly oriented spins

И. В. Федотов, Lyubov V. Amitonova, Dmitry A. Sidorov-Biryukov +12 more

We demonstrate fiber-optic magnetometry using a random ensemble of nitrogen-vacancy (NV) centers in nanodiamond coupled to a tapered optical fiber, which provides a waveguide delivery of optical fields for the initialization, polarization, and readout of the electron spin in NV centers.

Optics Letters•Nov 26, 2014•39 citations

Ultrathin fiber-taper coupling with nitrogen vacancy centers in nanodiamonds at cryogenic temperatures

Masazumi Fujiwara, Hong-Quan Zhao, Tetsuya Noda +3 more

We demonstrate successful cooling of ultrathin fiber tapers and their coupling with nitrogen vacancy (NV) centers in nanodiamonds at cryogenic temperatures. Nanodiamonds containing multiple NV centers are deposited on ultrathin fiber tapers with diameters ranging from 450-500 nm. The fiber tapers were successfully cooled down to 9 K with our special fiber mount and an optimization of cooling speed. The fluorescence coupled with the fiber tapers showed characteristic sharp zero-phonon lines of neutral and negatively charged NV centers. The present demonstration is important for the future NV-based quantum information devices and sensitive nanoscale cryogenic magnetometry.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Mar 15, 2016•3 citations

Ultrathin fiber-taper coupling with nitrogen vacancy centers in nanodiamonds at cryogenic temperatures

Masazumi Fujiwara, Hong-Quan Zhao, Tetsuya Noda +3 more

We demonstrate cooling of ultrathin fiber tapers coupled with nitrogen vacancy (NV) centers in nanodiamonds to cryogenic temperatures. Nanodiamonds containing multiple NV centers are deposited on the subwavelength 480-nm-diameter nanofiber region of fiber tapers. The fiber tapers are successfully cooled to 9 K using our home-built mounting holder and an optimized cooling speed. The fluorescence from the nanodiamond NV centers is efficiently channeled into a single guided mode and shows characteristic sharp zero-phonon lines (ZPLs) of both neutral and negatively charged NV centers. The present nanofiber/nanodiamond hybrid systems at cryogenic temperatures can be used as NV-based quantum information devices and for highly sensitive nanoscale magnetometry in a cryogenic environment.

arXiv:1601.06188•Optics Letters•Dec 2, 2015•31 citations

Manipulation of single nanodiamonds to ultrathin fiber-taper nanofibers and control of NV-spin states toward fiber-integrated λ -systems

Masazumi Fujiwara, Kazuma Yoshida, Tetsuya Noda +4 more

We report on the coupling of single nitrogen vacancy (NV) centers to ultrathin fiber-taper nanofibers by the manipulation of single diamond nanocrystals on the nanofibers under real-time observation of nanodiamond fluorescence. Spin-dependent fluorescence of the single NV centers is efficiently detected through the nanofiber. We show control of the spin sub-level structure of the electronic ground state using an external magnetic field and clearly observe a frequency fine tuning of [Formula: see text]. This observation demonstrates a possibility of realizing fiber-integrated quantum λ-systems, which can be used for various quantum information devices including push-pull quantum memory and quantum gates.

Nanotechnology•Oct 7, 2016•36 citations
We demonstrated a fiber-integrated diamond-based magnetometer in this paper. In the system, the fluorescence of nitrogen vacancy (NV) centers in nanodiamonds deposited on a tapered fiber was coupled to the tapered fiber effectively and detected at the output end of the fiber. By using this scheme, optically detected electron spin resonance spectra were recorded for single NV centers. The results confirmed that such a tapered fiber-nanodiamond system can act as a magnetometer. Featured with excellent portability, convenient fabrication, and potential for further integration, the constructed system has been demonstrated to be a practical magnetometer prototype.
Coupling NV-rich diamond with optical fibers opens the door to guiding quantum information via the NV center's spin state. While diamond-functionalized fiber sensors have shown excellent sensitivity to localized magnetic fields, their distributed sensing capabilities have been untapped. By embedding diamonds throughout the fiber's core, we create a sensor sensitive to magnetic fields along its entire length. This theoretically allows for distributed optical readout of small magnetic fields. However, challenges remain in pinpointing the source's location and understanding the performance of a sensor where the NV-center fluorescence is detected at a single endpoint, integrating signals from color centers in varying field and microwave conditions. We present a demonstration of distributed magnetic field sensing using a step-index fiber with NV-rich diamonds incorporated throughout the core. By collecting the NV fluorescence at the fiber's output and recording Optically Detected Magnetic Resonance (ODMR) spectra as the excitation source moves, we can map the magnetic field profile along the fiber, accurately locating the field source. This straightforward sensor design holds promise for applications such as magnetic field mapping of integrated circuits in photonics and spintronics.
Efficient collection of photoluminescence arising from spin dynamics of nitrogen vacancy (NV) centers in diamond is important for practical applications involving precise magnetic field or temperature mapping. These goals may be realized by the integration of nanodiamond particles with optical fibers and volumetric doping of the particles alongside the fiber core. That approach combines the advantages of robust axial fixation of NV diamonds with a direct spatial overlap of their fluorescence with the guided mode of the fiber. We developed a suspended core silicate glass fiber with 750 nm-diameter nanodiamonds located centrally in the 1.5 µm-core cross-section along its axis. The developed fiber probe was tested for its magnetic sensing performance in optically detected magnetic resonance measurements using a 24 cm-long fiber sample, with the NV excitation and fluorescence collection from the far ends of the sample and yielding optical readout contrast of 7% resulting in 0.5 µT·Hz-1/2 magnetic field sensitivity, two orders of magnitude better than in earlier designs. Thanks to its improved fluorescence confinement, the developed probe could find application in magnetic sensing over extended fiber length, magnetic field mapping or gradiometry.
We demonstrate successful cooling of ultrathin fiber tapers and their coupling with nitrogen vacancy (NV) centers in nanodiamonds at cryogenic temperatures. Nanodiamonds containing multiple NV centers are deposited on ultrathin fiber tapers with diameters ranging from 450-500 nm. The fiber tapers were successfully cooled down to 9 K with our special fiber mount and an optimization of cooling speed. The fluorescence coupled with the fiber tapers showed characteristic sharp zero-phonon lines of neutral and negatively charged NV centers. The present demonstration is important for the future NV-based quantum information devices and sensitive nanoscale cryogenic magnetometry.
We demonstrate cooling of ultrathin fiber tapers coupled with nitrogen vacancy (NV) centers in nanodiamonds to cryogenic temperatures. Nanodiamonds containing multiple NV centers are deposited on the subwavelength 480-nm-diameter nanofiber region of fiber tapers. The fiber tapers are successfully cooled to 9 K using our home-built mounting holder and an optimized cooling speed. The fluorescence from the nanodiamond NV centers is efficiently channeled into a single guided mode and shows characteristic sharp zero-phonon lines (ZPLs) of both neutral and negatively charged NV centers. The present nanofiber/nanodiamond hybrid systems at cryogenic temperatures can be used as NV-based quantum information devices and for highly sensitive nanoscale magnetometry in a cryogenic environment.
We report on the coupling of single nitrogen vacancy (NV) centers to ultrathin fiber-taper nanofibers by the manipulation of single diamond nanocrystals on the nanofibers under real-time observation of nanodiamond fluorescence. Spin-dependent fluorescence of the single NV centers is efficiently detected through the nanofiber. We show control of the spin sub-level structure of the electronic ground state using an external magnetic field and clearly observe a frequency fine tuning of [Formula: see text]. This observation demonstrates a possibility of realizing fiber-integrated quantum λ-systems, which can be used for various quantum information devices including push-pull quantum memory and quantum gates.