Large-area, tridimensional uniform microwave antenna for quantum sensing based on nitrogen-vacancy centers in diamond

Abstract

Fig. 1. (a) Sketch map of DMRSA (yellow) with diamond (red) and laser (green). (b) Distribution of simulated B ac in xz plane.

Optimized Planar Microwave Antenna for Nitrogen Vacancy Center Based Sensing Applications

“…The predominant limitation in maximizing the radiated field amplitude was given by a frequency mismatch leading to significant back reflections of the input MW signal characterized by the high frequency circuitry component’s S -parameter. In accordance with other reported work, we minimized the S -parameter of the antenna and consequently the back reflection of the input signal at 2.87 GHz [ 45 , 46 , 47 , 51 , 52 , 53 , 54 , 56 ]. Optimizing the -antenna for NV sensing involving variable, high magnetic bias fields, and for obtaining complete ODMR spectra, required us to maximize the antenna bandwidth.…”

“…Stripline antennas tend to be large in size and overload piezo scanners in confocal microscopes when placed on top [ 43 , 44 , 45 , 46 ]. Coil antennas only radiate MW of low amplitude [ 47 , 48 , 49 ]. Resonators are limited in bandwidth [ 50 , 51 , 52 , 53 , 54 , 55 , 56 ].…”

Optimized Planar Microwave Antenna for Nitrogen Vacancy Center based Sensing Applications

“…Commonly used antenna concepts show design related limitations with respect to these applications: wire antennas suffer from inhomogeneity in the radiated fields requiring precise positioning [42], while stripline antennas tend to be large in size and overload piezo scanners in confocal microscopes when placed on top [43][44][45][46]. Coil antennas only radiate MW of low amplitude [47][48][49] and resonators are limited in bandwidth [50][51][52][53][54][55][56].…”

Highly transparent conductors for optical and microwave access to spin-based quantum systems

“…Additionally, there are approaches for even larger but more homogeneous antenna structures in the range of millimetres but these have the disadvantage of a low bandwidth. 10,11 For minimising the sensor size without blocking the excitation or fluorescence, transparent conducting thin films are promising materials as microwave conductors. Optically transparent electronics already have many applications such as solar cells, 12 photo detectors, 13 transistors, 14 diodes 15 or as conductive films in microscopy.…”