Browsing by Subject "Nanobeam"
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Item Open Access Design, fabrication, and applications of electrostatically buckled nanomechanical systems(Bilkent University, 2018-08) Erbil, Selçuk OğuzBuckling is an important resource for memory and sensing applications at the micro- and nano-scale. Although di erent approaches have been developed to access buckling, such as the use of pre-stressed beams or thermal heating, none of them can dynamically and precisely control the critical bifurcation parameter |the compressive stress on the nanobeam| while keeping the heat generation and power dissipation at levels acceptable for real-life applications. Here, we develop an all-electrostatic architecture to control the compressive force, as well as the direction and amount of buckling, without heat generation. The devices, consisting of contact pads, comb-drive and beam, have been fabricated on Silicon on Insulator (SOI) chip by using micro-/nano-fabrication techniques. With this architecture, we demonstrated fundamental aspects of device function and dynamics. By applying signal voltages as low as 0.5 V, we controlled the direction of buckling to store binary information. Lateral de ections as large as 12% of the beam length were achieved, allowing nanomechanical manipulations at large deformations. We performed fatigue tests on the device which showed no discernible damage even after 10,000 buckling cycles. By modulating the compressive stress and lateral electrostatic force acting on the beam, we tuned the potential energy barrier between the post-bifurcation stable states and observed persistent transitions between the states. The proposed architecture, in this work, opens avenues for developing DC-controlled multibit nanomechanical logic gates, nano-manipulators, switches, and for studying the relationship between entropy and information.Item Open Access Pre- and post-buckling analysis of nanobeams(Bilkent University, 2019-02) Vardar, OnurInterest in nanobeams is increasing as their application areas widen and new properties are discovered. These structures exhibit size dependent intrinsic properties that are absent in macroscale. This requires employment of new material models as bulk models by themself are not sufficient to describe the physics unless one considers the domain as a composite material, which is undesirable. In this work it was confirmed that incorporation of surface elasticity results in a good match with experiments. Moreover it was shown that due to lack of out-of-plane shear support of surfaces and curves, Euler beam assumptions fail for numerical implementations when the beam size reduces. This phenomenon was shown to be a severe drawback for curved energetic domains with a still noticable effect for surface energies. A geometrically nonlinear buckling model is proposed based on linear elastic material model. It is implemented in an ordinary differential equations solver and the solutions were confirmed to meet the finite element method (FEM) results to a very high degree. The theory is integrated with surface layers in which its accuracy was confirmed when compared with FEM results.