Abstract
We investigate the possibility of spatially and spectrally controlling the thermal infrared emission by exploitation of the Yagi-Uda antenna design. Hybrid antennas composed of both SiC and Au rods are considered and the contributions of emission from all the elements, at a given equilibrium temperature, are taken into account. We show that the detrimental effect due to thermal emission from the not ideal parasitic elements drastically affect the performances of conventional thermal Au antennas in the 12 µm wavelength range. Nevertheless, our results show that the hybrid approach allows the development of efficient narrow-band and high directivity sources. The possibility of exploiting the Yagi-Uda design both in transmission and in reception modes, may open the way to the realization of miniaturized, efficient, robust and cheap sensor devices for mass-market applications.
Highlights
The availability of low cost, integrated, radiation sources in the infrared range with narrowband emission spectrum and good directional selectivity is of great importance in a variety of applications such as infrared sensing [1], thermophotovoltaics [2], radiation cooling [3], and thermal circuits [4]
Metals have been extensively studied in the visible and near IR range; enhancement and selectivity of thermal emission have been obtained thanks to resonant plasmon polariton excitation. These effects are stronger in a spectral range close to the plasma frequency of the metal and become weaker in the mid-wavelength IR (MWIR)
We considered the thermal emission from a 5 elements YU antenna, at an equilibrium temperature of 400 K
Summary
The availability of low cost, integrated, radiation sources in the infrared range with narrowband emission spectrum and good directional selectivity is of great importance in a variety of applications such as infrared sensing [1], thermophotovoltaics [2], radiation cooling [3], and thermal circuits [4]. Enhancement and control of thermal radiation have been investigated in gratings [15], metamaterials [16,17,18,19], metasurfaces [20] and single nanoantennas [21] It has been shown, both theoretically and experimentally, that sub-wavelength patterning of materials supporting surface polaritons results in narrow emission lobes. Metals have been extensively studied in the visible and near IR range; enhancement and selectivity of thermal emission have been obtained thanks to resonant plasmon polariton excitation. These effects are stronger in a spectral range close to the plasma frequency of the metal and become weaker in the mid-wavelength IR (MWIR). It has been shown that it is possible to use porous SiC to create narrow-band emitting/absorbing metamaterials [25] with a certain degree of tunability in order to match absorption lines of hazardous materials [26,27] in the 12-14 μm wavelength range
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