Electrical switching of devices based on graphene for optical modulation

• Grant number: 17/07557-1
• Support type: Scholarships in Brazil - Master
• Effective date (Start): November 01, 2017
• Effective date (End): June 30, 2019
• Field of knowledge: Engineering - Electrical Engineering - Telecommunications
• Principal Investigator: Lúcia Akemi Miyazato Saito
• Grantee: Maria Cecília Schineider Araújo
• Home Institution: Centro de Pesquisas Avançadas em Grafeno, Nanomateriais e Nanotecnologia (MackGrafe). Universidade Presbiteriana Mackenzie (UPM). Instituto Presbiteriano Mackenzie. São Paulo , SP, Brazil
• Associated research grant: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration, AP.SPEC

Abstract

The objective of this project is to develop a process of manufacture and characterization of graphene-based electro-optical modulator with the structure of a FET (Field Effect Transistor) on a waveguide, where electric gate voltage (Vg) is applied on the device in order to modulate the optical signal. The optical modulator will consist of a graphene CVD (Chemical Vapor Deposition) layer transferred to the polished side of an optical fiber, which called D-shaped optical fiber and covered by ionic liquid with the function of dielectric and gate contact. This sample is fixed on a silica substrate between two metallic contacts, which will have the function of source and drain. The performance of the electro-optical graphene modulator is going to be evaluate by considering three important parameters: frequency modulation (f), the gate voltage (Vg), and the modulation depth (Pmod), whose is calculated by the absorption difference between the two propagation modes, TE and TM.