  Simultaneously concentrating EM waves and heat fluxes to the same target
region within an on-chip system carries substantial academic research
importance and practical application value. Nevertheless, existing researches
are primarily aimed at the design and experimentation of concentrators for
individual EM waves or temperature fields. In this work, a thermal-EM
concentrator, capable of simultaneously concentrating EM waves and heat fluxes,
is designed using transformation optics/thermodynamics and fabricated with
engineered EM-thermal metamaterials. The concentrating effects of the proposed
thermal-EM concentrator on the thermal fluxes and EM waves are verified through
numerical simulations and experimental measurements, respectively, which are in
good agreement with each other. Both numerically simulated and experimentally
measured results demonstrate the concentrating capability of the proposed
thermal-EM concentrator, which can concentrate broadband TM-polarized EM waves
ranging from 8-12 GHz and heat/cold flows to the same target region within an
on-chip operating environment. The thermal-EM concentrator exhibits a thermal
focusing efficiency close to 100% and more than three times enhancement of the
magnetic field at the designed center frequency of 10 GHz. The proposed
thermal-EM concentrator can be utilized for efficient cooling for the specified
component and simultaneously enhancing the EM antenna's radiation/reception
efficiency within an on-chip system.
