Chanelière, in 2014 International Topical Meeting on Microwave Photonics (2014), pp. Harrington, in GOMAC Technical Conference (Ĭharleston, 2014), pp. Bandwidth hopping spread spectrum (BHSS) has recently been proposed as a spectrum-efficient technique to combat jamming. In addition, an increase of the NV centers quantity could lead both to an increase of the microwave sensitivity and to a decrease of the minimum refresh rate down to a few μ s. Since the optical properties of NV centers can be maintained even in high magnetic field, we estimate that an optimized device could allow frequency analysis in a range of 30 GHz, only limited by the amplitude of the magnetic field gradient. With such integration time, a field of a few hundreds of μ W can be detected. The time dependent spectral analysis of an amplitude modulated microwave signal is demonstrated over a bandwidth of 600 MHz, associated to a frequency resolution of 7 MHz, and a refresh rate of 4 ms. A magnetic field gradient induces a Zeeman shift of the resonances and transforms the frequency information into spatial information, which allows for the simultaneous analysis of the microwave signal in the entire frequency bandwidth of the device. The resonances induced by the magnetic component of that field are detected through a decrease of the NV centers photoluminescence. An incoming microwave signal is converted into a microwave field in the area of the NV centers by a loop shaped antenna. Its photoluminescence is imaged through an optical microscope and monitored by a digital camera. An ensemble of nitrogen-vacancy (NV) centers held in a diamond plate is pumped by a 532 nm laser. We propose an original analog method to perform instantaneous and quantitative spectral analysis of microwave signals.
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