Research

Our research is aimed for exploring the field of nanophotonics and developing new methods of sensing methods for material science, chemistry and biology.

 

Our research interests include

  1. Optical nanofiber sensing devices for single cell analysis and for cryogenic optical probing (Fig.1,2)

  2. Quantum nanothermometry of living organisms with diamond nitrogen-vacancy (NV) center electron spins (Fig.3)

  3. Development of optical microscope integrated electron spin resonance (ESR) spectrometer 
    and its application for biological and chemical analysis. (Fig. 4)

Fig.1: Optical nanofibers

Nano Lett.  11, 4362 (2011).

Sci. Rep. 5, 9619 (2015).

Fig.2: Diamond NV centers

Nanotechnology 27, 455202 (2016).

Opt. Express 20, 10490 (2012).

Fig.3: Fluorescent nanodiamonds in cells.

Fig.4: Quantum sensing of
                                nanoparticle rotations

Nanophotonics is an active research field that emerges from the collaborations of nanotechnology and photonics. Nanophotonics studies the dynamics of the light confined in the nanoscale level. Confining the light in the small volume enhances the light-matter interactions and enables various fascinating phenomena of light and hence applications (efficient fluorescence collection, optical nonlinearity at a single photon level).

             

With exploiting the enhanced light-matter interactions, we develop nanophotonic devices that can sense chemical reactions in liquids and cells. We also work on an optical measurement of electron spins in molecules or solids. Electron spins are very sensitive to the nanoscale environment, such as molecular conformations and local magnetic fields. By optically measure the electron spins, we are able to get nanoscale information with spatial resolution smaller than the diffraction limit.

Sci. Reports 8, 14773 (2018).

MF in preparation.

arXiv:1811.02235 (2018).

arXiv:1802.07431 (2018).

Masazumi Fujiwara

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