arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.14093physics.opticsphysics.ins-det
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用于太赫兹探测和成像的发光二极管中的太赫兹强场物理

Terahertz Strong-Field Physics in Light-Emitting Diodes for Terahertz Detection and Imaging

Chen Ouyang, Shangqing Li, Jinglong Ma, Baolong Zhang, Xiaojun Wu, Wenning Ren, Xuan Wang, Dan Wang, Zhenzhe Ma, Tianze Wang, Tianshu Hong, Peidi Yang, Zhe Chen… 展开作者

Chen Ouyang, Shangqing Li, Jinglong Ma, Baolong Zhang, Xiaojun Wu, Wenning Ren, Xuan Wang, Dan Wang, Zhenzhe Ma, Tianze Wang, Tianshu Hong, Peidi Yang, Zhe Cheng, Yun Zhang, Kuijuan Jin, Yutong Li

摘要:

强太赫兹(THz)电磁场通过对基元激发和集体激发的非微扰驱动,揭示了许多材料中的各种极端非线性光学效应。然而,这种非线性光响应尚未在发光二极管(LED)中发现,更不用说将它们用作快速,成本效益,紧凑和室温操作的THz探测器和相机。在这里,我们报告无处不在的LED表现出巨大的和快速的光伏信号具有优异的信噪比时,被太赫兹场强度>50 kV/cm的照明。我们还成功展示了THz-LED探测器和相机原型。这些非正统的THz探测器表现出高响应率(>1 kV/W),响应时间比热释电探测器短四个数量级。探测机制是太赫兹场诱导的非线性碰撞电离和肖特基接触。这些发现不仅有助于加深我们对强太赫兹场与物质相互作用的理解,而且对强太赫兹场诊断的应用也有很大的贡献。

英文摘要:

Intense terahertz (THz) electromagnetic fields have been utilized to reveal a variety of extremely nonlinear optical effects in many materials through nonperturbative driving of elementary and collective excitations. However, such nonlinear photoresponses have not yet been discovered in light-emitting diodes (LEDs), letting alone employing them as fast, cost effective,compact, and room-temperature-operating THz detectors and cameras. Here we report ubiquitously available LEDs exhibited gigantic and fast photovoltaic signals with excellent signal-to-noise ratios when being illuminated by THz field strengths >50 kV/cm. We also successfully demonstrated THz-LED detectors and camera prototypes. These unorthodox THz detectors exhibited high responsivities (>1 kV/W) with response time shorter than those of pyroelectric detectors by four orders of magnitude. The detection mechanism was attributed to THz-field-induced nonlinear impact ionization and Schottky contact. These findings not only help deepen our understanding of strong THz field-matter interactions but also greatly contribute to the applications of strong-field THz diagnosis.

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。

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