Deterministic Laser Writing of Spin Defects in Nanophotonic Cavities
- URL: http://arxiv.org/abs/2210.00177v2
- Date: Thu, 6 Oct 2022 01:28:15 GMT
- Title: Deterministic Laser Writing of Spin Defects in Nanophotonic Cavities
- Authors: Aaron M. Day, Jonathan R. Dietz, Madison Sutula, Matthew Yeh and
Evelyn L. Hu
- Abstract summary: Ex-situ defect formation processes prevent real-time defect-cavity characterization.
We demonstrate direct laser-writing of cavity-integrated spin defects using a nanosecond-pulsed above-bandgap laser.
This real-time in-situ method of localized defect formation, paired with demonstration of cavity-integrated defect spins, marks an important step in engineering cavity-emitter coupling for quantum networking.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: High-yield engineering and characterization of cavity-emitter coupling is an
outstanding challenge in developing scalable quantum network nodes. Ex-situ
defect formation processes prevent real-time defect-cavity characterization,
and previous in-situ methods require further processing to improve emitter
properties or are limited to bulk substrates. We demonstrate direct
laser-writing of cavity-integrated spin defects using a nanosecond-pulsed
above-bandgap laser. Photonic crystal cavities in 4H-silicon carbide serve as a
nanoscope monitoring silicon monovacancy (V$_{Si}^-$) defect formation within
the $100~\text{nm}^3$ cavity mode volume. We observe defect spin resonance,
cavity-integrated photoluminescence and excited-state lifetimes consistent with
conventional defect formation methods, without need for post-irradiation
thermal annealing. We further find an exponential reduction in excited-state
lifetime at fluences approaching the cavity amorphization threshold, and show
single-shot local annealing of the intrinsic background defects at the
V$_{Si}^-$ formation sites. This real-time in-situ method of localized defect
formation, paired with demonstration of cavity-integrated defect spins, marks
an important step in engineering cavity-emitter coupling for quantum
networking.
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