Polarization- and frequency-tunable microwave circuit for selective excitation of nitrogen-vacancy spins in diamond

We report on a planarmicrowave resonator providing arbitrarily polarized oscillatingmagnetic fields that enable selective excitation of the electronic spins of nitrogen-vacancy centers indiamond. Thepolarization plane is parallel to the surface ofdiamond, which makes the resonator fully compatible with (111)-orienteddiamond. The field distribution is spatially uniform in a circular area with a diameter of 4  mm, and a near-perfect circularpolarization is achieved. We also demonstrate that the originalresonance frequency of 2.8 GHz can be varied in the range of 2 –3.2 GHz by introducing varactor diodes that serve as variablecapacitors.

Source: Applied Physics Letters - November 3, 2016 Category: Physics Authors: Johannes Herrmann, Marc A. Appleton, Kento Sasaki, Yasuaki Monnai, Tokuyuki Teraji, Kohei M. Itoh and Eisuke Abe Source Type: research