• About
  • Policies
  • What is open access
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Mechanical Engineering
      • Dept. of Mechanical Engineering - Master's degree
      • View Item
      •   BUIR Home
      • University Library
      • Bilkent Theses
      • Theses - Department of Mechanical Engineering
      • Dept. of Mechanical Engineering - Master's degree
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Nanomechanical buckling for applications in nonlinear dynamics

      Thumbnail
      Embargo Lift Date: 2022-01-26
      View / Download
      10.3 Mb
      Author(s)
      Demiralp, Berke
      Advisor
      Hanay, Mehmet Selim
      Date
      2021-07
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
      Item Usage Stats
      262
      views
      42
      downloads
      Abstract
      There 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.
      Keywords
      NEMS
      Buckling
      Chaos
      Chaotic dynamics
      Optomechanics
      Permalink
      http://hdl.handle.net/11693/76480
      Collections
      • Dept. of Mechanical Engineering - Master's degree 86
      Show full item record

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsCoursesThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsCourses

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 2976
      © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy