Nanomechanical buckling for applications in nonlinear dynamics

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buir.advisorHanay, Mehmet Selim
dc.contributor.authorDemiralp, Berke
dc.date.accessioned2021-08-25T12:41:38Z
dc.date.available2021-08-25T12:41:38Z
dc.date.copyright2021-07
dc.date.issued2021-07
dc.date.submitted2021-07-27
dc.departmentDepartment of Mechanical Engineeringen_US
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (M.S.): Bilkent University, Department of Mechanical Engineering, İhsan Doğramacı Bilkent University, 2021.en_US
dc.descriptionIncludes bibliographical references (leaves 44-49).en_US
dc.description.abstractThere has not been enough attention on post buckling behavior at nano scale even though it reveals rich nonlinear and chaotic dynamics and has potential to be used on cutting edge sensing, actuation, computation and communication applications. Here, full motion of the nanomechanical buckling, starting from un-buckled position to large deformations at post buckling regime has been precisely measured with error bars of ±7 nm for large deformation regime and ±2.8 nm for √ initial bending, with a noise floor of 38.5 pm/ Hz. Line mode of SEM is used for deflection detection which uses secondary electrons collected from sample and relevant code is developed for data processing. Initial bending, initial buckling and inflection point are well defined which can help us to understand transition to post buckling regime and development of sensors and actuators. Additionally, one well oscillation, double well oscillation and chaotic trajectories are investi-gated using the system as forced double well oscillator. Trajectory plotting is performed with an image processing code which benefits from contrast difference of the device and environment. A new region within double well oscillation regime is observed where motion converts from one well oscillation to double well oscilla-tion which could be a candidate on mechanical computation and communication applications. Also, a preliminary design for synchronized chaos experiments using the same buckling platform is developed. Finally, an optomechanical experimental setup and chip is built for measure-ment of one or multiple NEMS beams. Fiber optic techniques are used for exper-imental setup and grating couplers, ring/racetrack resonators are develoxper-imental setup and grating couplers, ring/racetrack resonators are developed for beam measurements. Critical couplings on multiple devices are observed.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityby Berke Demiralpen_US
dc.embargo.release2022-01-26
dc.format.extentxii, 64 leaves : color illustrations ; 30 cm.en_US
dc.identifier.itemidB159930
dc.identifier.urihttp://hdl.handle.net/11693/76480
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectNEMSen_US
dc.subjectBucklingen_US
dc.subjectChaosen_US
dc.subjectChaotic dynamicsen_US
dc.subjectOptomechanicsen_US
dc.titleNanomechanical buckling for applications in nonlinear dynamicsen_US
dc.title.alternativeDoğrusal olmayan dinamik uygulamaları için nanomekanik bükülmeen_US
dc.typeThesisen_US

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