Parisa Mahmoudi

Requirement of voltage up-converters due to high pull-in voltage is one of the main problems by merely electrostatic actuated MEMS-based Switches. Thermally actuated switches are another alternatives but with very high power dissipation. In this paper a low voltage switch is demonstrated, which uses a combined thermo-electrostatic actuator. The switch can be integrated with standard CMOS circuits without any up-converters. Thermally power dissipation for the switch is lower than just thermal actuators. The switching time is about 70 ms and the maximal temperature of thermal actuator is lower than 150 oC which cannot cause any longtime damage.

Abstract. Background: Optical stimulation of the brain is based on optrodes with integrated optical splitters to excite multiple neurons simultaneously. This requires efficient light delivery systems. Aim: In order to satisfy optical requirements, to reduce the fabrication costs, and to obtain less invasive implantation into the brain, we assess a polymer-based microdevice both in theory and experiments. Approach: In addition to design and evaluation of the device using Multiphysics software, to achieve a feasible implementation, we base our fabrication process on off-the-shelf ultraviolet adhesives as the functional material with fascinating optical and mechanical characteristics all together, easy photolithographic-only curing, and no more steps required for common soft lithographic-based materials. Results: Wideband transmission of optical signals over the visible/near-infrared together with uniform splitting of the input power from different light sources has been observed and recorded using an optical setup with acceptable agreement with the simulation outcomes. Conclusions: Our research proposes a flexible and biocompatible optical splitter to be used as a light delivery system for a wide variety of optical stimulation methods in neuroscience studies with fewer or no changes in the design, dimensions, and even exploited materials. So it is a multipurpose device.

For correct performance of switched reluctance motors, the current of each phase must applied to when its inductance is going to increase. So energy of power supply of the system can moved to each phase. To reach to such coordination, it is essential to design a controller and a converter circuit. So far, various converters have proposed for SRMs and all have advantages and drawbacks. In addition, there are different ways to control these motors. These topologies designed on the base of the use of minimum numbers of elements for better operation. In this paper, a new c-dump converter is proposed. This plan has the advantage of use of simplest and lowest elements. In addition, it does not need to any controller circuit to discharge the capacitor. The converter circuit has been simulated, constructed, and tested successfully. All simulated and measurement results have been compatible.

Requirement of voltage up-converters due to high pull-in voltage is one of the main problems by merely electrostatic actuated Microelectromechanical system-based switches. Thermally actuated switches are another alternatives but with very high power dissipation. In this paper a low voltage switch is demonstrated, which uses a combined thermo-electrostatic actuator. The switch can be integrated with standard CMOS circuits without any up-converters. Thermally power dissipation for the switch is lower than just thermal actuators. The switching time is about 70µs and the maximal temperature of thermal actuator is lower than 150oC which cannot cause any longtime damage. Isolation and Insertion Loss quantities have been calculated to -25dB and -0.65dB at 20GHz from HFSS results respectively.

Abstract. Background: Optical stimulation of the brain is based on optrodes with integrated optical splitters to excite multiple neurons simultaneously. This requires efficient light delivery systems. Aim: In order to satisfy optical requirements, to reduce the fabrication costs, and to obtain less invasive implantation into the brain, we assess a polymer-based microdevice both in theory and experiments. Approach: In addition to design and evaluation of the device using Multiphysics software, to achieve a feasible implementation, we base our fabrication process on off-the-shelf ultraviolet adhesives as the functional material with fascinating optical and mechanical characteristics all together, easy photolithographic-only curing, and no more steps required for common soft lithographic-based materials. Results: Wideband transmission of optical signals over the visible/near-infrared together with uniform splitting of the input power from different light sources has been observed and r...