Abstract
This work describes the design and optimization of a printed circuit board containing a rectangular half-loop coil designed to apply radio frequency signals on micrometric diamond crystals. The structure was optimized to maximize the magnetic field perpendicular to the coil at 2,87 GHz. In the optimization process we have used transmission line theory, circuit level and 3D electromagnetic simulations. The structure was implemented and measured. The adopted methodology was validated by the good agreement between theory and experiments.
Highlights
Diamond crystals, either natural or artificial, may contain lattice defects capable of changing its physical properties. One of these defects is the N-V center, a point defect consisting of a nitrogen atom and a lattice vacancy [1]. This defect is common in diamond lattice and has potential applications in magnetometry, quantum computation, cryptography, among other areas [1] [2] [3]
In the absence of magnetostatic fields, this emission is reduced by approximately 10% when the center is exposed to a radio frequency (RF) field at 2.87 GHz [7]
In order to maximize the current flow, the input impedance of the board is minimized at this frequency, maximizing the current injected by the RF generator
Summary
Either natural or artificial, may contain lattice defects capable of changing its physical properties. The transmission line connecting the RF generator to the half-loop had its length Lt optimized to maximize the current flow (and thereby the magnetic field) at 2.87 GHz. In order to maximize the current flow, the input impedance of the board is minimized at this frequency, maximizing the current injected by the RF generator. This indicates a maximum near 2.87 GHz, as desired
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