Free-standing silicon nitride nanobeams with an efficient fiber-chip interface for cavity QED

We present the design, fabrication and characterization of high quality factor silicon nitride nanobeam PhC cavities at visible wavelengths for coupling to diamond color centers in a cavity QED system. We demonstrate devices with a quality factor of ∼24, 000 (±250) around the zero-phonon line of the...

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Bibliographic Details
Published in:Optical materials express 2020-12, Vol.10 (12), p.3192
Main Authors: Alajlan, Abdulrahman, Khurana, Mohit, Liu, Xiaohan, Cojocaru, Ivan, Akimov, Alexey V.
Format: Article
Language:English
Subjects:
Color centers
Coupling
Diamonds
Germanium
Holes
Q factors
Silicon nitride
Waveguides
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Summary:We present the design, fabrication and characterization of high quality factor silicon nitride nanobeam PhC cavities at visible wavelengths for coupling to diamond color centers in a cavity QED system. We demonstrate devices with a quality factor of ∼24, 000 (±250) around the zero-phonon line of the germanium-vacancy center in diamond. We also present an efficient fiber-to-waveguide coupling platform for suspended nanophotonics. By gently changing the corresponding effective indices at the fiber-waveguide interface, we achieve a coupling efficiency of ∼96% (±2%) at the cavity resonance.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.411219