Abstract
Toroidal metamaterials stand out by extremely high-Q resonances. Their radiation losses are suppressed, and fields in the metamolecules are extremely high and sensitive to the additional losses. In this work, we introduce a novel concept of metabolometer. It is based on the combination of a microwave high-Q factor toroidal metamaterial as readout device with embedded micro-pad superconductor as an absorber of terahertz (THz) radiation. We establish that a pad with 20 kΩ/sq sheet resistance reduces metamaterial Q-factor and changes the stop-band level by as much as –50 dB at 1.5 GHz. Importantly, this sensitivity to the additional losses requires no galvanic connection to the absorber. This allows one to detect THz heating of superconducting pad via the change in metamaterial transmission spectrum. We consider the absorber as a superconducting hafnium film because of its nonlinear response at 1.5 GHz below {{T}_{c}} = 400 mK. Respectively, we estimate the losses in hafnium over temperature at the metamaterial resonant frequency using Mattis–Bardeen theory. This approach can significantly improve the future design of the terahertz/millimeter-wave detectors.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
