Chalcogenide Glass-on-Graphene Photonics

Abstract

自2010年安德烈•海姆和康斯坦丁•诺沃肖洛夫因石墨烯研究获诺贝尔物理学奖以来，二维材料因其在电、热、光及磁等方面独特性质，近年一直是国际学术热点研究中心之一，成为业界关注的焦点。特别是利用二维材料与物质的光相互作用，在开发新型高性能光电子器件具有广阔的应用前景。该合作研究团队开展了系统且深入的理论和实验研究，提出直接在石墨烯上生长硫系玻璃并制备集成光子器件的新思想，极大增强了石墨烯与材料的光相互作用，同时充分发挥硫系玻璃宽波段光透明的优势，首次成功研制片上集成的硫系玻璃中红外光探测器、中红外光调制器、光偏振器及热光开关，为二维材料集成光子器件向中红外波段开发应用开辟了崭新途径。 该研究工作由麻省理工学院、厦门大学、中佛罗里达大学、重庆大学及英国南安普顿大学等国内外多个课题组紧密合作完成，厦门大学电子工程系为第二单位，厦门大学博士生黄义忠（罗正钱与蔡志平教授共同指导）为论文共同第一作者，罗正钱副教授署名共同作者。这是我校首次在《自然•光子学》上刊登研究成果。【Abstract】Two-dimensional (2D) materials are of tremendous interest to integrated photonics, given their singular optical characteristics spanning light emission, modulation, saturable absorption and nonlinear optics. To harness their optical properties, these atomically thin materials are usually attached onto prefabricated devices via a transfer process. Here, we present a new route for 2D material integration with planar photonics. Central to this approach is the use of chalcogenide glass, a multifunctional material that can be directly deposited and patterned on a wide variety of 2D materials and can simultaneously function as the light-guiding medium, a gate dielectric and a passivation layer for 2D materials. Besides achieving improved fabrication yield and throughput compared with the traditional transfer process, our technique also enables unconventional multilayer device geometries optimally designed for enhancing light–matter interactions in the 2D layers. Capitalizing on this facile integration method, we demonstrate a series of high-performance glass-on-graphene devices including ultra-broadband on-chip polarizers, energy-efficient thermo-optic switches, as well as graphene-based mid-infrared waveguide-integrated photodetectors and modulators.Funding support is provided by the National Science Foundation under award nos.1453218, 1506605 and 1509197. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under grant no.1122374.R.-J.S. and D.E. gratefully acknowledge funding support by the the Center for Excitonics, an Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under award no.DE-SC0001088.C.-C.H.and D.H.were funded in part through the Future Photonics Manufacturing Hub (EPSRC EP/N00762X/1).The authors also acknowledge fabrication facility support by the MIT Microsystems Technology Laboratories and the Harvard University Center for Nanoscale Systems, the latter of which is supported by the National Science Foundation under award no.0335765. 该研究工作获得国家自然科学基金、福建省杰出青年科学基金等课题资助