High sensitivity HgTe room temperature terahertz photodetector

The advent of topological semi-metals with peculiar band structure and exotic quantum-transport provides novel pathways for upgrading the performance terahertz (THz) detection. HgTe is among such a candidate unique advantages negative bandgap, ultra-high mobility, thermoelectricity, which ignites possibility addressing technical bottlenecks traditional routes THz Herein, first time, we report large-area (3 in.) growth high-mobility thin-film via molecular-beam epitaxial implementation bow-tie antennas based THz-detector abilities ultrafast response, low noise, high ambient-stability at room temperature. By exploration strong light-coupling superior hot-carrier transport, antenna-based photodetector can achieve responsivity 0.04 A/W noise equivalent power less than 0.6 nW/Hz1/2 0.3 THz. Furthermore, sensitivity be further improved by nearly an order magnitude up to 0.36 incorporating short channel asymmetric cubic resonator. reported performances allow realistic bulk states in semimetals large area, fast-imaging applications band.