在强光-物质耦合机制下工作的量子级联探测器中极化激元到电子的直接隧穿
Direct polariton-to-electron tunneling in quantum cascade detectors operating in the strong light-matter coupling regime
AI总结：
本文研究强光-物质耦合下量子级联探测器的光电流机制，证明极化激元态共振隧穿是主要提取机制，暗子带间态不参与，并用半经典耦合模式理论成功重现光学和电学谱。
摘要：
我们展示了在强光-物质耦合机制下工作的中红外量子级联探测器（QCD）。它们工作在约 λ = 10 μm 波长处，最小 Rabi 劈裂为 9.3 meV。基于 QCD 中输运的通常描述的简单模型无法重现光电流谱中的极化激元特征。相反，基于半经典耦合模式理论的更精细方法能够以极好的一致性重现光学和电学谱。通过将吸收/光响应与模拟相关联，我们证明在该系统中，来自极化激元态的共振隧穿是主要的提取机制。暗的子带间态不参与该过程，这与电注入极化激元发射器中所发生的情况相反。
英文摘要：
We demonstrate mid-infrared quantum cascade detectors (QCD) operating in the strong light-matter coupling regime. They operate around $λ= 10~μm$ with a minimum Rabi splitting of 9.3 meV. A simple model based on the usual description of transport in QCDs does not reproduce the polaritonic features in the photo-current spectra. On the contrary, a more refined approach, based on the semi-classical coupled modes theory, is capable to reproduce both optical and electrical spectra with excellent agreement. By correlating absorption/photo-response with the simulations, we demonstrate that - in this system - resonant tunneling from the polaritonic states is the main extraction mechanism. The dark intersubband states are not involved in the process, contrary to what happens in electrically injected polaritonic emitters.
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