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6CCVD Research

Formation of two-dimensional multichannel vertical optical waveguides in a nitrogen-vacancy center diamond using a femtosecond Bessel beam laser for local quantum sensing

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2025-04-21
JournalApplied Physics Letters
AuthorsNoriko Kurose, Kotaro Obata, Shintaro Nomura, Takayo Ogawa, Satoshi Wada
InstitutionsUniversity of Tsukuba

Abstract

Section titled “Abstract”

Nitrogen vacancy (NV) centers in diamonds can function as quantum sensors for measuring magnetic fields, temperature, and stress with high sensitivity. They are useful in various biological applications, such as for measuring the local magnetic and electrical fields and signal propagation in tissues as well as their local interaction dynamics. However, to enable measurements suitable for medical applications, an observation system that can noninvasively map neural activity from the magnetic fields generated by brain nerve cells with high spatial resolution and sensitivity is required. We fabricated a vertical waveguide array in a diamond containing nitrogen vacancy (NV) centers with cell size dimension using a green femtosecond Bessel beam laser. The red emission from NV centers within the waveguide is confined inside the waveguide (typically with a cell size of 15 μm) by the total internal reflection at its walls. This enables efficient optical confinement and improves the light collection performance of the NV center emission. We have also developed a sensor—called the diamond micro-NV center array device (MAED)—that allows the observation of local magnetic field distributions and have measured spatial distribution of magnetic field with cell-size accuracy. This approach makes it possible to perform localized measurements of electrical and magnetic properties, as well as dynamic mapping of biological systems. This technological innovation holds a significant potential for the noninvasive observation of functional networks in cortical neurons.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
  1. 2024 - Intravital microscopic thermometry of rat mammary epithelium by fluorescent nanodiamond [Crossref]
  2. 2016 - Optical magnetic detection of single-neuron action potentials using quantum defects in diamond [Crossref]
  3. 2023 - Microscopic-scale magnetic recording of brain neuronal electrical activity using a diamond quantum sensor [Crossref]
  4. 2021 - Fast, cell-resolution, contiguous-wide two-photon imaging to reveal functional network architectures across multi-modal cortical areas [Crossref]
  5. 2016 - Inscription of 3D waveguides in diamond using an ultrafast laser [Crossref]
  6. 2016 - Diamond photonics platform enabled by femtosecond laser writing [Crossref]
  7. 2022 - Quantum technologies in diamond enabled by laser processing [Crossref]
  8. 2021 - Integrated magnetometry platform with stackable waveguide-assisted detection channels for sensing arrays [Crossref]
  9. 2017 - Laser writing of coherent color centers in diamond [Crossref]
  10. 2021 - Morphological study of nanostructures induced by direct femtosecond laser ablation on diamond [Crossref]

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