Abstract
We present experimental observations of light-controlled resonance effects in microwave whispering-gallery-mode quasi-optical dielectric-semiconductor disk resonators in the frequency band of 5 GHz to 20 GHz arising due to illumination from a light emitting diode (LED) of 50W power range. We obtain huge enhancement of photo-sensitivity (growing with the resonator Q-factor) that makes light-microwave interaction observable with an ordinary light (no laser) at conventional brightness (like an office lighting) in quasi-optical microwave structures at rather long (centimeter-scale) wavelength. We also demonstrate non-conventional photo-response of Fano resonances when the light suppresses one group of resonances and enhances another group. The effects could be used for the optical control and quasi-optical switching of microwave propagation through either one or another frequency channel.
Highlights
Whispering-gallery-mode (WGM) resonators found numerous applications[1] due to their exceptional performance associated with extremely high quality factors Q
We present experimental observations of light-controlled resonance effects in microwave whispering-gallery-mode quasi-optical dielectric-semiconductor disk resonators in the frequency band of 5 GHz to 20 GHz arising due to illumination from a light emitting diode (LED) of 50W power range
We present experimental observations of light-controlled resonance effects in microwave whispering-gallery-mode (WGM) disk resonators in the frequency band of 5 GHz to 20 GHz arising due to illumination from a light emitting diode (LED) integrated circuit array of 50W power range
Summary
Whispering-gallery-mode (WGM) resonators found numerous applications[1] due to their exceptional performance associated with extremely high quality factors Q. We present experimental observations of light-controlled resonance effects in microwave whispering-gallery-mode (WGM) disk resonators in the frequency band of 5 GHz to 20 GHz arising due to illumination from a light emitting diode (LED) integrated circuit array of 50W power range. Light-controlled microwave devices offer the advantages of very high bandwidth and unique functionality, in quasi-optical systems in the higher frequency bands.[15,16,17] Optically controlled dielectric WGM resonators have been considered in this respect.[18] In distinction from numerical simulations in Ref. 18 where signal transmission peaks are of interest (the resonator works as a pass-band filter), we present experimental study of those cases when the resonant deeps in signal transmission are the main feature (the structure is used as a stop-band filter device)
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