Epitaxial grapheme for photonics and optoelectronics

——光子学与光电子学中的外延石墨烯

报告人：季伟  教授 (新加坡国立大学)

时间：5月31日（周四）上午10：00

地点：物理馆512会议室

Abstract:

Since the discovery of exfoliated graphene in 2004, it has been in the exclusive domain of condensed-matter physicists for understanding its unique electronic and optical properties and of material scientists for syntheses of high-quality, large-scale and cost-effective graphene. Now, research focus has been shifted towards exploring its applications in electronic devices due to its excellent material properties, such as high electronic mobility, optical transparency, and other quantum-mechanical properties. As a potential material in photonics and optoelectronics, graphene has also been demonstrated by several recent results, ranging from solar cells and light-emitting devices to touch screens, photodetectors and ultrafast lasers. For in-depth review, readers are referred to Ref. [1]. Here, we present our demonstration of epitaxial graphene for photonic and optoelectronic devices,in particular, forboth two-photon absorbers[2] and large-area, efficient photodetectors [3,4].

Reference:

[1]      Graphene photonics and optoelectronics, Bonaccorso F, Sun Z, Hasan T and Ferrari AC, Nature Photonics4, 611 (2010).

[2]       Giant two-photon absorption in bilayer graphene, Yang H, Feng X, Wang Q, Huang H, Chen W, Wee ATS, Ji W, Nano Letters11, 2622 (2011).

[3]        Laser patterning of epitaxial graphene for Schottky junction photodetectors, Singh RS, Nalla V, Chen W, Wee ATS, Ji W, ACS Nano5, 5969 (2011).

[4]        Photoresponse in epitaxial graphene with asymmetric metal contacts, Sing RS, Nalla V, Chen W, Ji W, Wee ATS, ApplPhysLett100, 093116 (2012).

Biography of Wei Ji

1978-1982:       Fudan University, Shanghai, China, B,Sc in Physics.

1983-1990:       Heriot-Watt University, Edinburgh, Scotland UK, M.Sc in  Optoelectronics, PhD in Physics, and Research Associate.

1991-date:       National University of Singapore, Singapore, Lecturer, Associate Professor, Full Professor and Vice Dean of Science Faculty.

During the above period, as a visiting scholar, he spent 2~5 months, respectively, in University of Tokyo, Japan; Rensselaer Polytechnic Institute, Troy, NY; and Center for Research and Education in Optics and Lasers, University of Central Florida, FL.

Since 2011, he has been appointed as Associate Editor for Optical Materials Express. He co-authored 200 or so research papers with an h-index of 39.