Building novel photonics with 2D materials
二维材料光子器件的构筑
Goki Eda
ABSRACT
Modern electronic and photonic technologies are enabled by ingeniously designed artificial heterostructures that allow electrical and optical signals to be manipulated. The advent of graphene and other two-dimensional (2D) materials, and the development of their atomically precise van der Waals heterostructures, opened up exciting prospects for realizing device functions that are otherwise impossible with conventional materials. Strongly excitonic 2D semiconductors such as monolayer MoS2 and WSe2 are attractive for their rich many-body physics and the ease of photonic device integration. At Eda Lab, we explore and exploit the optoelectronic behaviors of excitons and their complexes through device and materials engineering. This talk will focus on our approaches to realizing electrical generation, manipulation, and detection of excitons based on various heterostructure schemes. I will discuss how hexagonal boron nitride tunnel barrier allow electrically tunable excitonic electroluminescence and electro-optic upconversion effects. We demonstrate that ultrafast interlayer charge and energy transfer dynamics is key to understanding heterostructure optoelectronics. For closing remarks, I will highlight open questions and discuss the prospects of 2D semiconductors for quantum photonics.
精心设计的人工异质结构可以实现对电和光信号的操纵,是现代电子和光子技术的基石。石墨烯和其他二维材料的出现,以及原子层精度的范德华异质结构的组装,为实现常规材料无法实现的器件功能开辟了前景。以MoS2和WSe2为代表的单原子层二维半导体,因其强的激子效应、丰富的多体物理特性和易于集成于光子器件而受到广泛关注。我们实验室通过材料和器件工程来探索二维半导体中的激子及其衍生的更复杂的准粒子的光电特性。在这个报告中,我们将重点讨论基于各种异质结构来实现激子的电激发、操纵和探测。我们探索了六角氮化硼的隧穿势垒如何实现电可调谐的激子电致发光和电光上转换效应。同时我们发现超快的层间电荷转移和能量转移动力学是理解二维异质结构光电子学的关键因素。最后,我会提到一些开放问题并展望二维半导体材料在量子光学的应用前景。
BIOGRAPHY
Dr. Eda received his M.Sc. in Materials Science and Engineering from Worcester Polytechnic Institute in 2006 and Ph.D. in the same discipline from Rutgers University in 2009. He became a Newton International Fellow of the Royal Society of the UK and worked at Imperial College London. He joined the National University of Singapore as an Assistant Professor of Physics and Chemistry, and a member of the Centre for Advanced 2D Materials (CA2DM) in 2011. He is a recipient of the Singapore National Research Foundation (NRF) Research Fellowship and many awards including the Singapore National Academy of Science (SNAS) Young Scientist Award, University Young Researcher Award, and IPS Omicron Nanotechnology Award. He is an Associate Editor of npj 2D Materials and Applications. Dr. Eda investigates a wide range of physical and chemical properties of two-dimensional materials with a focus on their photonic device applications.
江田博士分别于2006年和2009 年获得伍斯特工业学院材料科学与工程硕士学位和罗格斯大学博士学位。随后他作为英国皇家学会的牛顿国际研究员在伦敦帝国理工学院工作。他于2011年加入新加坡国立大学(NUS),担任物理和化学系助理教授,同时是NUS先进二维材料中心(CA2DM)的成员。他获得新加坡国家研究基金会研究学者(NRF Reserach Fellowship)的资助,并获得了包括新加坡国家科学院(SNAS)青年科学家奖,新加坡国立大学优秀青年研究员奖和IPS Omicron纳米科技奖等奖项。同时他担任npj 2D Materials and Applications的副编辑。他同时也是Web of Science的高被引科学家。江田博士的研究主要集中在二维材料的物理和化学特性,并重点关注其在光子器件中的应用。