Sharif Digital Repository

Molecular Dynamics as a powerful method in the field of Nano-simulation has been widely used in recent years. Different contact processes such as Nano-manipulation, AFM Imaging, and Nano-indentation can be simulated using this method. There have been numerous researches done on calculating techniques of simulation of different phenomena in Nano-technology. Specifically, friction and Nano-indentation which are parts of Nano-contact processes have been simulated by different investigators. However, on some other parts, e.g. Nano-manipulation and AFM Imaging, there are few studies done up to now. Thus, a simulation and computational software seems necessary in this field. The main goal of... 

This thesis is aimed at the modeling and control of atomic force microscope (AFM) in order to improve the scanning speed and achieving video-rate imaging to realize the real-time observation of dynamic phenomena at the nanoscale. The lumped parameter model of the AFM in the non-contact operation mode is studied in this project. The tip-sample interaction is the Van der Waals force, which makes the model nonlinear. Two mathematical models of the AFM cantilever are derived and investigated in order to gain detailed insights into the system dynamics. These models are tip excited and base excited cantilever. The former is solved by the method of multiple scales and the latter is analyzed by the... 

Various applications of nanostructures in electronics, optoelectronics, MEMS, photonics and plasmonic make their fabrication an interesting research topic recently. Progress in nanotechnology depends on the capability to fabricate, position and interconnect nanometer-scale structures. The development of fabrication devices with nanoscales is mainly dependent on the existence of a suitable nanolithography approach. Patterning materials with nanoscale features aimed at improving integration and device performance faced several challenges. The limitation of conventional lithography systems including resolution related issues, operational costs and lack of flexibility to pattern organic and...