Geometry and material optimization of long wave infrared seebeck nanoantennas
2021
Long wave infrared imaging systems require small, low cost and low power systems operating at room-temperature. Seebeck nanoantennas are room temperature detectors which generate voltage due to incident electromagnetic radiation, they also provide polarization sensitivity, directivity, small footprint, tunability and the possibility of integration into electronic and photonic circuits. In this work different materials and fabrication processes used in Seebeck bowtie nanoantennas are numerically simulated in order to optimize its response in the long wave infrared region of the electromagnetic spectrum (8–14 μm.) Gold bowtie nanoantennas with thermoelectric connections made of Bi3Te2 and Sb3Te2 showed the highest responsivity values of 9 V/W for gold bowtie nanoantennas on a SiO2 substrate and 240 V/W for gold bowtie free-standing structures. Computer simulations also showed that the thermoelectric response of these detectors add linearly when connecting them in series.
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