基于发光二极管的强场太赫兹相机  

A Light-Emitting Diode-Based Strong-Field Terahertz Camera

作　　者：李尚卿 欧阳琛 马景龙[1] 张保龙 吴晓君 徐继红 李玉同[1,2,5] Li Shangqing;Ouyang Chen;Ma Jinglong;Zhang Baolong;Wu Xiaojun;Xu Jihong;Li Yutong(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,Chinese Academy of Sciences,Beijing 100049,China;School of Electronic and Information Engineering,Beijing University,Beijing 100191,China;Beijing Office,Texas Instruments Inc.,Beijing 100190,China;Songshan Lake Materials Laboratory,Dongguan,Guangdong 523808,China)

机构地区：[1]中国科学院物理研究所北京凝聚态物理国家实验室,北京100190 [2]中国科学院大学物理学院,北京100049 [3]北京航空航天大学电子信息工程学院,北京100191 [4]德州仪器(中国)有限公司北京办事处,北京100190 [5]松山湖材料实验室,广东东莞523808

出　　处：《光学学报》2021年第24期78-84,共7页Acta Optica Sinica

基　　金：国家自然科学基金(11827807,61905007);中国科学院战略重点研究计划(XDA25010000,XDB16010200)。

摘　　要：报道了一种基于发光二极管(LED)的强脉冲场太赫兹相机,其工作原理是皮秒脉宽的强场太赫兹辐照到LED之后,当太赫兹电场强度大于50 kV/cm时,由于碰撞电离效应,LED两端会产生纳秒脉宽的光伏信号。利用此效应成功制备了扫描式和阵列式的LED太赫兹相机,并捕捉到了由铌酸锂倾斜波前技术产生的强场太赫兹焦斑。该相机有成本低、信号强、响应快、成像面积大等特点,并会为发展基于强场非线性效应的太赫兹成像技术提供新思路。A strong-pulsed-field terahertz camera based on light emitting diode(LED) is reported in this paper.It is based on the operational principle that LED can generate nanosecond pulse-duration photovoltaic signal with a reproducible response to picosecond pulse-duration intense terahertz irradiation due to impact ionization when terahertz electric field strength is larger than 50 kV/cm.By employing this effect,we fabricate scanning and array LED-terahertz cameras.These devices have successfully captured images of focused terahertz beam profile generated in lithium niobate via the tilted pulse front technique.The proposed camera has characteristics of low cost,strong photovoltaic signal,rapid response,and large imaging area.Meanwhile,it would give a new idea in developing terahertz imaging technology based on strong-field nonlinear effect.

关 键 词：成像系统 发光二极管 强脉冲场太赫兹 倾斜波前 太赫兹成像 

分 类 号：O437[机械工程—光学工程]