This study demonstrates the enhancement of frequency selectivity in thermal terahertz sensors using antenna structures, suggesting advances in spectroscopic applications.
Thermal terahertz (THz) sensors can detect broadband THz waves; however, they lack frequency selectivity, which hinders their application to spectroscopic measurements. In this study, we imparted frequency selectivity by including an antenna structure within the photo-thermo-electric (PTE) sensor. We used laser ablation to process a carbon nanotube film into a 100 m-scale wire-grid structure and generated a THz resonance in it. We applied this technology to develop frequency-selective thermal sensors by forming the THz-receiving material of PTE sensors into antenna structures with frequency-selective pixels. Thus, the proposed technique could significantly aid in developing on-chip THz spectrometers.
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Suzuki et al. (2025) studied this question.
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