太赫兹光电探测的Dyakonov-Shur理论中的几何效应
Geometric effects in the Dyakonov-Shur theory of Teraherz photodetection
AI总结：
本文建立了短栅极及多栅极情形下Dyakonov-Shur太赫兹光电探测的完整理论，揭示了栅极定位对探测效率的影响，并给出估算最优栅极位置的解析公式。
摘要：
场效应晶体管中等离子体波的非线性共振实现了一种众所周知的光电探测机制，该机制由Dyakonov和Shur于九十年代首次提出，尤其适用于太赫兹（THz）频率范围。对该机制的理论分析总是假设晶体管的栅极——即与接收太赫兹信号的天线耦合的电极——与沟道本身一样长，这与典型的实验器件不符，在实验器件中通常采用短栅极，例如由于制造工艺的限制。在这项工作中，我们克服了这一局限，并提供了存在短栅极情况下Dyakonov-Shur光电探测的完整理论。我们以足够通用的方式发展该理论，使其也能够处理存在多个栅极的情形。我们发现，栅极的次优定位会显著降低器件的探测效率，并提供了一个紧凑的解析公式，用于快速估计最优栅极位置。
英文摘要：
Nonlinear resonances of plasma waves in field-effect transitors enable a well-known photodetection mechanism, first introduced by Dyakonov and Shur in the Nineties, especially suited to the Terahertz (THz) frequency range. Theoretical analyses of the mechanism always assume that the gate of the transistor, which is coupled to the antenna receiving the THz signal, is as long as the channel itself, at odds with typical experimental devices, where short gates are usually employed, e.g. due to fabrication constraints. In this work we overcome this limitation and provide a complete theory of Dyakonov--Shur photodetection in the presence of short gates. We develop our theory in such a general fashion that allows us to also treat the case in which multiple gates are present. We find that a sub-optimal positioning of the gates can substantially decrease the detection efficiency of the device and provide a compact analytical formula to quickly estimate the optimal gate position.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
