ArticleACS photonics2026
Infrared Illumination-Induced Responsivity Enhancement in Photoelectric Tunable-Step Terahertz Detectors.
Article in ACS photonics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Quantum phenomena in two-dimensional electron gases (2DEGs) provide new opportunities for high-responsivity far-infrared detection. A prime example is photoelectric tunable-step (PETS) terahertz (THz) detectors, which use the in-plane photoelectric (IPPE) effect as a sensitive photonic detection mechanism. Here, we show that the terahertz sensitivity of this quantum photodetection mechanism can be dynamically tuned by using infrared illumination. We leverage the persistent photoconductivity (PPC) effect in AlGaAs/GaAs-based heterostructures to tune the device performance by adjusting the electron density and mobility of the channel. Our approach enables optimization of the responsivity for different operating modes and dynamic control over the output impedance of PETS terahertz detectors of approximately one order of magnitude. We provide an explanation for the underlying physics that advances the understanding of quantum photodetection phenomena in 2DEGs. Our findings pave the way to in situ tunable optoelectronics combining concepts from the infrared and terahertz spectral regions.
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