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We investigate the possibility of spatially and spectrally controlling thethermal infrared emission by exploitation of the Yagi-Uda antenna design.Hybrid antennas composed of both SiC and Au rods are considered and thecontributions of emission from all the elements, at a given equilibriumtemperature, are taken into account. We show that the detrimental effect due tothermal emission from the not ideal parasitic elements drastically affect theperformances of conventional thermal Au antennas in the 12 micrometerswavelength range. Nevertheless, our results show that the hybrid approachallows the development of efficient narrow-band and high directivity sources.The possibility of exploiting the Yagi-Uda design both in transmission and inreception modes, may open the way to the realization of miniaturized,efficient, robust and cheap sensor devices for mass-market applications.

Hybrid Thermal Yagi-Uda Nanoantennas for Directional and Narrow Band Long-wavelength IR Radiation Sources