超快太赫兹自旋光电子学研究进展(特邀)  

Development of Ultrafast Spin-based Terahertz Photonics(Invited)

作　　者：金钻明 郭颖钰 季秉煜 李章顺 马国宏[2] 曹世勋[2] 彭滟[1] 朱亦鸣[1] 庄松林[1] JIN Zuanming;GUO Yingyu;JI Bingyu;LI Zhangshun;MA Guohong;CAO Shixun;PENG Yan;ZHU Yiming;ZHUANG Songlin(Terahertz Technology Innovation Research Institute,Shanghai Key Lab of Modern Optical System,and Engineering Research Center of Optical Instrument and System(Ministry of Education),Terahertz Spectrum and Imaging Cooperative Innovation Center,University of Shanghai for Science and Technology,Shanghai 200093,China;Department of Physics,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海理工大学,太赫兹技术创新研究院,上海市现代光学系统重点实验室光,学仪器与系统教育部工程中心,太赫兹光谱与影像技术协同创新中心,上海200093 [2]上海大学理学院物理系,上海200444

出　　处：《光子学报》2022年第7期235-252,共18页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61988102,61975110,61735010);111项目(No.D18014);上海市科委国际联合实验室项目(No.17590750300);上海市科委重点项目(No.YDZX20193100004960);上海市科学技术委员会科技创新行动计划项目(No.21JC1402600);上海市青年科技启明星计划(No.18QA1401700);上海市教育委员会和上海市教育发展基金会“晨光计划”(No.16CG45);上海高校青年东方学者计划(No.QD2015020)。

摘　　要：太赫兹科学技术在光谱、成像、传感、生物医药、安全检测等方面展现出了巨大的应用潜力和价值。基于新材料和新机理,研发高效、超宽带和低成本的太赫兹光子学器件是太赫兹科学技术的重要挑战。近年来的研究表明,太赫兹光子学和超快自旋电子学深度交叉,获得了很大的关注。本文对超快太赫兹自旋光电子学所研究的物理机理和器件设计应用进行讨论。在物理机理研究方面,阐明了太赫兹脉冲为研究超快自旋电子学提供强大工具,实现了太赫兹驱动自旋波,探测自旋输运和超快磁测量。在器件设计与应用方面,介绍了基于自旋的新型太赫兹光子学器件,包括自旋太赫兹辐射源的优化方法,自旋太赫兹调制器的工作原理,自旋太赫兹探测器的设计方案。超快太赫兹自旋光电子学不仅有助于人们理解宏观自旋电子学现象背后的微观物理机制,而且有望实现高效的太赫兹光子学器件和光谱学应用。Terahertz(THz)radiation is generally defined as the region of the electromagnetic spectrum in the range of 0.1 to 10 THz,between the millimeter and infrared frequencies. THz radiation is important from both scientific and application point of view. THz science and technology has been an active research area for a wide variety of applications:such as spectroscopy,imaging and sensing,biology and medical sciences,and security evaluation. The development of efficient,ultra-broadband,and low-cost THz photonic devices requires new materials and mechanisms,which is the key challenge for the field of THz science and technology. The discovery of THz electromagnetic pulse emission from ultrafast demagnetization by femtosecond laser pulses gave insight into the microscopic interactions that connect the ultrafast spintronics and the THz photonics.Based on our experimental observations,this paper reviews the recent developments and applications,the current understanding of the physical processes,and the perspectives of ultrafast spin-based THz photonics.Firstly,ultrashort THz pulses have been demonstrated as a promising tool to investigate the ultrafast spintronics. We review the fundamental physical processes and properties including THz-driven spin waves,THz spin transport probing,and ultrafast THz magnetometry. 1)The THz pulses are used to excite and control the antiferromagnetic spin waves in rare-earth orthoferrites with the THz time-domain spectroscopy. In addition, we observe the magnon-polariton, magnon-spin coupling, and magnonmagnon coupling in the condensed matter systems. 2)We demonstrate the magnetic modulation of THz waves,along with heat-and contact-free giant magnetoresistance,tunneling magnetoresistance and anisotropic magnetoresistance readout using ultrafast THz signals. We directly determine the spindependent densities and momentum scattering times of conduction electrons. The various magnetic configurations between the parallel state and antiparallel state of the magnetizations of the ferromagnetic layers

关 键 词：太赫兹 自旋电子学 超快光谱 太赫兹产生和调控 

分 类 号：TN241[电子电信—物理电子学]