Efficiently excite nitrogen-vacancy (NV) centers in diamond and collect their
fluorescence significantly benefit the fiber-optic-based NV sensors. Here,
using a tapered optical fiber (TOF) tip, we significantly improve the
efficiency of the laser excitation and fluorescence collection of the NV, thus
enhance the sensitivity of the fiber-optic based micron-sized diamond magnetic
sensor. Numerical calculation shows that the TOF tip delivers a high numerical
aperture (NA) and has a high fluorescence excitation and collection efficiency.
Experiments demonstrate that using such TOF tip can obtain up to over 7-fold
the fluorescence excitation efficiency and over15-fold the fluorescence
collection efficiency of a flat-ended (non-TOF) fiber. Such fluorescence
collection enhances the sensitivity of the optical fiber-based diamond NV
magnetometer, thus extending its potential application region.Comment: 11 pages, 13 figure

Arumugam, Sri Ranjini

Balasubramanian, Gopalakrishnan

Chang, Huan-Cheng

Du, Guanxiang

Duan, Dewen

Kavatamane, Vinaya Kumar

Tzeng, Yan-Kai

English

arXiv

Deutsche Forschungsgemeinschaft                     http://dx.doi.org/10.13039/501100001659Max-Planck-Gesellschaft                     http://dx.doi.org/10.13039/501100004189Niedersächsische Ministerium für Wissenschaft und Kultur                     http://dx.doi.org/10.13039/10001193

Duan, D.

Du, G. X.

Kavatamane, V. K.

Arumugam, S.

Tzeng, Y.-K.

Chang, H-C

Balasubramanian, G.

GRO.publications (Univ. Göttingen)

Efficient nitrogen-vacancy centers’ fluorescence excitation and collection from micrometer-sized diamond by a tapered optical fiber in endoscope-type configuration

Using an optical fiber to both excite the nitrogen-vacancy (NV) center in diamond and collect its fluorescence is essential to build NV-based endoscope-type sensor. Such endoscope-type sensor can reach inaccessible fields for traditional NV-based sensors built by bulky optical components and extend the application areas. Since single NV's fluorescence is weak and can easily be buried in fluorescence from optical fiber core's oxide defects excited by the green laser, fixing a micrometer size diamond containing high-density NVs rather than a nanodiamond containing single NV or several NVs on the apex of an optical fiber to build an endoscope-type sensor is more implementable. Unfortunately, due to small numerical aperture (NA), most of the optical fibers have a low fluorescence collection efficiency, which limits the sensitivity and spatial resolution of the NV-based endoscope-type sensor. Here, using a tapered optical fiber (TOF) tip, we significantly improve the efficiency of the laser excitation and fluorescence collection of the NV ensembles in diamond. This could potentially enhance the sensitivity and spatial resolution of the NV-based endoscope-type sensor. Numerical calculations show that the TOF tip delivers a high NA and has a high NV excitation and fluorescence collection efficiency. Experiments demonstrate that such TOF tip can obtain up to over 7-fold excitation efficiency and over 15-fold fluorescence collection efficiency of that from a flat-ended fiber (non-TOF) tip

Du, G.

Kavatamane Rathnakara, V.

Tzeng, Y.

Chang, H.

MPG.PuRe

Efficient nitrogen-vacancy centers' fluorescence excitation and collection from micrometer-sized diamond by a tapered optical fiber in endoscope-type configuration.

Efficient nitrogen-vacancy centers' fluorescence excitation and
  collection from micrometer-sized diamond by a tapered optical fiber

Efficient nitrogen-vacancy centers' fluorescence excitation and collection from micrometer-sized diamond by a tapered optical fiber

Abstract

Similar works

Full text

Available Versions

GRO.publications (Univ. Göttingen)

MPG.PuRe