Radio frequency response of GaN-based SAW oscillator to UV illumination by the Sun and man-made source

Abstract

A new solar-blind UV detector based on a GaN surface acoustic wave delay line oscillator is reported. The illumination by an artificial UV source in the presence of sunlight increased the RF spectral line width of the oscillator by almost an order of magnitude, which we attribute to the different noise spectra of these light sources. The output of this detector is a radio signal, which makes it especially attractive for remote sensing applications.