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IQSE AMO/QO Seminar Series

"Highly efficient Dielectric Resonator Antenna for ensembles of Nitrogen –vacancy color centers in diamond"

Dr. Alexey Akimov
Texas A&M University


Nitrogen-vacancy (NV) color center in diamond hold a promise of ultra-high sensitivity solid-state room temperature magnetometry. Sensor and metrology applications for situations when high sensitivity is concerned require efficient driving of the NV centers’ electronic spins within large volume. This places demand on the microwave antenna to produce a uniform and strong microwave (MW) magnetic field over a relatively large (few cubical millimeter) volume. A non-uniform MW field will lead to different Rabi frequencies for different regions of the sample, resulting in different dynamics for different parts of the ensemble

Achieving this ambitious goal requires ability to drive coherently large ensemble of NV centers. Traditionally manipulation of NV center spin state at room temperature is realized using simple microwave (MW) loop antenna, which proved strong, but not uniform MW field and therefore cannot be used to drive large ensemble of NV centers. Recently planar split-resonance antenna was suggested to address this issue. This antenna provide large and uniform at XY plane microwave magnetic film but due to fully planar design cannot provide uniform field in the third direction. Another alternative is Helmholtz loop antenna, which can provide uniform field but due to its large size provides week MW field.

In this work, we demonstrated new design of highly efficient dielectric resonator based microwave antenna able to create strong and uniform in 3D microwave magnetic field. High, up to 10 MHz Rabi frequency at modest excitation power of 5.2 W along with superior uniformity of the field was demonstrated on the example of commercially available diamond plate, containing NV color centers in diamond. This new high quality dielectric based antenna pave the way to few femtoTesla diamond based magnetometry.

Tuesday, February 13, 2018
IQSE Seminar Room, 12:00 Noon
(578 MPHY)

Institute for Quantum Science and Engineering
Texas A&M University

(Pizza and salad to be served at 11:30 am)