  Fast resonance frequency modulation of a superconducting stripline resonator
is investigated. The experiments are performed using a novel device which
integrates a hot electron detector (HED) into a superconducting stripline ring
resonator. Frequency modulation is demonstrated by both applying dc current or
voltage to the HED, and by applying optical illumination, with modulation
frequencies of up to 4.2GHz. Potential applications for such a device are in
telecommunication, quantum cryptography and biofluorescence.
