Abstract
A terahertz photo-thermoelectric (PTE) detector is proposed by integrating the metamaterial absorber with a metal thermocouple. The incident terahertz wave that is absorbed by the metamaterial absorber changes into heat, then the heat changes into electricity by using the metal thermocouple. The absorption performances, photo-thermal, and PTE conversion characteristics are investigated by the full vector finite element method. Simulation results show that the device can achieve near-perfect absorption in 1 THz, and exhibits a responsivity and noise equivalent power of 35 mV/W and 6.6×10−6 W/Hz1∕2, respectively. Meanwhile, with the advantages of room-temperature workability, wide-angle, high responsivity, simple structure, and easy integration, the device has potential applications in terahertz photoelectric detection, sensing, and imaging.
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