通过飞秒激光辐照随机二维金属纳米结构实现高功率太赫兹到红外发射。

High-power THz to IR emission by femtosecond laser irradiation of random 2D metallic nanostructures.

作者信息

Zhang Liangliang, Mu Kaijun, Zhou Yunsong, Wang Hai, Zhang Cunlin, Zhang X-C

机构信息

Department of Physics, Capital Normal University, No.105 XiSanHuan BeiLu, Beijing 100048, China.

The Institute of Optics, University of Rochester, Rochester, New York 14627, USA.

出版信息

Sci Rep. 2015 Jul 24;5:12536. doi: 10.1038/srep12536.

DOI:10.1038/srep12536

PMID:26205611

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4513341/

Abstract

Terahertz (THz) spectroscopic sensing and imaging has identified its potentials in a number of areas such as standoff security screening at portals, explosive detection at battle fields, bio-medical research, and so on. With these needs, the development of an intense and broadband THz source has been a focus of THz research. In this work, we report an intense (~~10 mW) and ultra-broadband (~~150 THz) THz to infrared (IR) source with a Gaussian wavefront, emitted from nano-pore-structured metallic thin films with femtosecond laser pulse excitation. The underlying mechanism has been proposed as thermal radiation. In addition, an intense coherent THz signal was generated through the optical rectification process simultaneously with the strong thermal signal. This unique feature opens up new avenues in biomedical research.

摘要

太赫兹（THz）光谱传感与成像已在许多领域展现出其潜力，如门户处的远距离安全筛查、战场爆炸物检测、生物医学研究等。基于这些需求，高强度宽带太赫兹源的开发一直是太赫兹研究的重点。在这项工作中，我们报道了一种高强度（约10 mW）且超宽带（约150 THz）的太赫兹到红外（IR）源，其具有高斯波前，由飞秒激光脉冲激发的纳米孔结构金属薄膜发射。其潜在机制被认为是热辐射。此外，在产生强热信号的同时，通过光整流过程还产生了强相干太赫兹信号。这一独特特性为生物医学研究开辟了新途径。