Print Email Facebook Twitter Optothermally excited parametric resonance in monolayer graphene nanodrum resonators Title Optothermally excited parametric resonance in monolayer graphene nanodrum resonators Author Chandrashekar, Abhilash (TU Delft Mechanical, Maritime and Materials Engineering) Contributor Alijani, Farbod (mentor) Dolleman, Robin Joey (mentor) Degree granting institution Delft University of Technology Date 2017-08-28 Abstract Ever since its inception, graphene has been the subject of research in many parts of theworld. This is due to its exceptional mechanical and electrical properties, which makes itideal for NanoElectroMechanical (NEMS) devices. The inherent nature of NEMS devices,includes low damping, large amplitudes of oscillation, resonant operating conditions, andthe presence of nonlinear force fields. This sets an ideal stage for the appearance of nonlinearbehavior. In this thesis, appearance of such nonlinear behavior in optothermally actuatedgraphene nanodrum resonators is studied. Frequency response arising from parametricexcitation is explained based on, time modulated stiffness due to temperature variation inthe membrane. Also, the response arising from direct excitation is discussed based on initialgeometric imperfection present in the membrane. In order to explain the nonlinear responseseen in graphene resonators, novel analytical models are developed and its correspondinglimitations are discussed. A single differential equation is used to simulate the behaviorof both directly and parametrically excited graphene nanoresonator. This equation isused to study the influence of nonlinear damping on response of the system. Then, anillustration is provided on characterization of graphene properties from the parametricresponse of the system. Finally, it is concluded that, alternative damping mechanism andother physical phenomena could be influencing the system dynamics. Therefore, modelingof these phenomena would lead to better matching of the experimental results. Subject GrapheneNanodrum ResonatorsmembranesParametric resonanceDirect resonanceNEMSMEMS devicesNonlinear dampingPerturbation AnalysisMaterial characterization To reference this document use: http://resolver.tudelft.nl/uuid:a38838e4-032e-40e4-a7fc-3246545132c3 Part of collection Student theses Document type master thesis Rights © 2017 Abhilash Chandrashekar Files PDF A.chandrashekar_4505921_M ... Report.pdf 10.57 MB Close viewer /islandora/object/uuid:a38838e4-032e-40e4-a7fc-3246545132c3/datastream/OBJ/view