Design of microwave antennas for nitrogen-vacancy centers applications
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Date
2018
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Abstract
Nitrogen-vacancy centers in diamond are promising candidates for a wide range of applications due to their quantum sensing capabilities at room temperature and easy optical readout
and manipulation by means of confocal microscopy and the application of microwave radiation.
Applying microwave radiation is not a trivial task depending on the application. If a single NV
center is addressed, then a thin (20 —m diameter) copper wire is sufficient if the NV is within
50 —m from the wire. However in a large area with a lot of NV centers that must be addressed
simultaneously with a homogeneous microwave intensity, then a more specialized microwave antenna is required.
Towards this goal, a complete procedure for developing microstrip antennas for NV centers applications is presented. In order to drive all NV centers that point along a given direction with
the same intensity, an antenna with a uniform intensity over this area is needed, which is not
a trivial task. At a given power, there is a compromise between a uniform intensity and high
intensity. This procedure includes the antenna design using optical lithography in order to achieve
the desired spatial resolution, fabrication and testing using a vector network analyzer and different
diamond samples. The fabricated antennas reached a maximum transmission of around 40% near
the desired frequency (2.87 GHz), a 100 MHz bandwidth and are capable of resolving electronic
spin resonance with a maximum contrast of 22%.
Description
Tesis (Master in Physics)--Pontificia Universidad Católica de Chile, 2018