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Monday, January 9, 2017
Abstract-Monolayer graphene based organic optical terahertz modulator
Guocui Wang, Bo Zhang, Hongyu Ji, Xin Liu, Ting He, Longfeng Lv, Yanbing Hou, Jingling Shen,
We investigate a high-efficiency broadband terahertz wavemodulator with structures made from the conjugated polymer [2-methoxy-5-(2′-ethylhexyloxy)-1, 4-phenylennevinylene], graphene, and Si, irradiated with an external excitation laser. We demonstrate a strategy that can alleviate the tradeoff between the requirements of modulation depth and modulation speed in polymer/silicon terahertz wavemodulators. Using terahertz time-domain and continuous-wave systems, we measured both the terahertz transmission modulation properties and the time responses of the modulatorstructures. The conjugated polymer/graphene/silicon structure achieved a high modulation factor of 93% for transmission as well as improved the modulation speed of the devices based on polymer/silicon. The high modulation efficiency of the polymer/graphene/silicon structure was induced by the enhancement in carrier density and the extremely high carrier mobility of graphene, respectively.