Laser reduced graphene oxide: a paradigm-shifting platform for
diffractive photonic devices

Graphene, a two dimensional carbon material with peculiar electronic and optical properties, such as ultra-high carrier mobility, electrical conductivity, and optical transmittance, has been a research hotspot in the emerging research fields nowadays. However, cost-effective and scalable production of graphene with large lateral sizes is still an enormous challenge for its practical applications. Laser induced reduction of graphene oxide provides an easy-to-implement, facile, and controllable approach, which avoids the complex additional transfer process needed in the traditional chemical and heat annealing reduction methods, to address the challenge. This novel reduction approach accelerates the developments of graphene-based advanced optoelectronic devices intensively. Especially, researches on the diffractive photonic devices based on the gradual and steerable changes of the refractive index via the reduction process are in the ascendant. 

    The research group of Professor Min Gu (Associate Deputy Vice-Chancellor for Research Innovation and Entrepreneurship at Royal Melbourne Institute of Technology University, Fellow of the Australian Academy of Science, Fellow of the Australian Academy of Technological Sciences and Engineering, Foreign Academician of Chinese Academy of Engineering) and Professor Xiangping Li (Institute of Photonics Technology, Jinan University, Guangzhou, China) have made great contributions to this cutting-edge area. In this article, a comprehensive review including ultra-broadband graphene oxide ultrathin lenses, athermally photoreduced graphene oxides for three-dimensional holographic images, etc. implemented by Professor Min Gu's group and Professor Xiangping Li is given. These research achievements prove that laser reduced graphene oxide has been a paradigm-shifting platform for diffractive photonic devices.

Schematic illustration of subwavelength scale and continuously tunable phase modulation in rGO holograms for full-color 3D displays achieved by exquisitely controllable photoreduction

About Group
Professor Xiangping Li (former member of Professor Min Gu’s group 2005-2015) and Professor Yaoyu Cao (former member of Professor Xuanming Duan’s group 2005-2009 and former member of Professor Min Gu’s group 2009-2016) established the Nanophotonic Devices Group at the Institute of Photonic Technology in Jinan University (Guangzhou, China). Their research orientations focus on the light-mater interactions at the subwavelength scale and their innovative applications in nanophotonic devices, such as meta & nano-plasmonics, nanoscale laser fabrication & storage, and superresolution biological imaging. In 2015, Professor Xiangping Li was awarded National Natural Science Funds for Distinguished Young Scholar. In 2017, the research group was selected in the Guangdong Provincial Pearl River Talent Program and awarded the Guangdong Provincial Innovation and Entrepreneurship Project. At present, the research group consists of 8 full-time researchers and welcome more domestic and overseas talents to join us!
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Wang S C, Ouyang X Y, Feng Z W, Cao Y Y, Gu M et al. Diffractive photonic applications mediated by laser reduced grapheneoxides. Opto- Electronic Advances 1, 170002 (2018).