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Quantum metasurface-based photoelectric tunable-step terahertz detector
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DOI：10.1117/1.AP.8.2.026011.png)
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Abstract
En 中文
High-responsivity terahertz (THz) detectors are essential for all THz applications. The combination of metamaterials with photonic detectors, such as quantum well and quantum dot detectors, led to quantum metamaterials enabling efficient sensing from the near to the far infrared ranges. Meanwhile, responsivity enhancement strategies in THz detectors based on 2D electron systems focused on approaches external to the detection unit, such as lens-coupling or a combination of detectors in arrays. We leverage the recently discovered in-plane photoelectric (IPPE) effect as a sensitive quantum mechanism of terahertz detection to realize a quantum metasurface-based photoelectric tunable-step detector. This approach combines a substantial photoresponse enhancement with design scalability, high radiation collection efficiency, easy device mounting, and a transistor-compatible fabrication process. The resulting detector reaches an external current responsivity of 2.7 A/W to 1.9 THz radiation at 10 K and at zero source-drain bias, corresponding to an external quantum efficiency as high as 2.1%. Our top-down design approach that starts with the metasurface design can be applied to any detectors employing 2D electron gases. Our work represents the first demonstration of a quantum metasurface employing the IPPE effect as a detection mechanism and widens the area of quantum metamaterials to detectors based on 2D electron systems.
Keywords:
in-plane photoelectric effect
terahertz detector
metamaterial
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