AI 中文总结
该研究提出输运定义的光探测，利用GaAs/AlGaAs半导体棘轮结构，通过电偏置选择载流子输运，实现宽光谱范围的互补响应，完成光-电转换，补充了可重构光探测方法。
AI 中文摘要
宽带光场可在强度和光谱分布两方面发生变化，但固定响应探测器会将这种演化信息映射为单一电信号。本文展示了输运定义的光探测，其中电偏置可选择光激发载流子的重新分布、逃逸及收集方式，在单个共享有源区内构建互补响应函数。在GaAs/AlGaAs半导体棘轮结构中，0 V时光驱动棘轮输运定义响应，-2 V时的光谱演化与场辅助热载流子输运一致。重叠态在5 K下覆盖0.4-94.5 μm的测量光谱范围，提供与状态相关的计算探测下限，并支持30 K下的联合红外工作。中红外7.432 GHz和太赫兹17.103 GHz处的直接光拍频证明了光-电转换，其共路输出可恢复施加的空间温度梯度及激光激发石墨的瞬态视场积分有效辐射温度。这些结果确立了光激发后输运作为半导体光探测器的功能定义设计变量，补充了结构定义、场调谐和光学编码的可重构光探测方法。
英文摘要
Broadband optical fields can change in both intensity and spectral distribution, but a fixed-response detector maps this evolving information onto a single electrical signal. Here we demonstrate transport-defined photodetection, in which electrical bias selects how photoexcited carriers are redistributed, escape and are collected, creating complementary response functions within one shared active region. In a GaAs/AlGaAs semiconductor ratchet, light-driven ratchet transport defines the response at 0 V, whereas the spectral evolution at -2 V is consistent with field-assisted hot-carrier transport. The overlapping states span a measured spectral range of 0.4-94.5 μm at 5 K, provide state-dependent calculated detection floors and support joint infrared operation at 30 K. Direct optical beat notes at 7.432 GHz in the mid-infrared and 17.103 GHz in the terahertz demonstrate optical-to-electrical conversion. Their common-path outputs recover an imposed spatial temperature gradient and the transient field-of-view-integrated effective radiation temperature of laser-excited graphite. These results establish post-photoexcitation transport as a function-defining design variable for semiconductor photodetectors, complementing structure-defined, field-tuned and optically encoded approaches to reconfigurable photodetection.
Comments18 pages, 6 figures
