Spiking and Resonant RF Sensors Based on Vanadium Dioxide
In this talk we will present recent results on the design, fabrication, and experimental investigation of vanadium dioxide phase change sensing architectures for radio frequency signal power, light and temperature. The principles used include stochastic oscillators and RF resonant structures. The sensitivity of phase change materials to low-power signals enables the development of efficient power detectors. The concept of uncooled mm-wave detection based on the sensitivity of IMT threshold voltage to the incident wave by exploiting the characteristics of reversible insulator-to-metal transition in vanadium dioxide (VO2) will be detailed and discussed. The fabricated sensors show record figures of merit, such as responsivities of around 66.3kHz/mW with a low noise equivalent power of 20nW at room temperature and smallest reported footprints. We will show and discuss relaxation VO2 oscillators with ultra-high tuning range (400%) that exploits the reversible metal-insulator transition in 2-terminal Vanadium Dioxide devices, which can serve for building low power spiking sensory architectures.