We present high-resolution multi-frequency single-pulse observations of the Vela pulsar, PSR B0833−45, aimed at studying micro-structure, phase-resolved intensity fluctuations and energy distributions at 1.41 and 2.30 GHz. We find micro-structure in about 80% of all pulses independent of observing frequency. The width of a micropulse seems to depend on its peak flux density, whilst quasi-period...

Polysilicon wine-glass mode micromechanical disk resonators using a stemless, non-intrusive suspension structure have been demonstrated in both vacuum and atmospheric pressure at frequencies around 73.4 MHz with Q’s as high as 98,000 in vacuum, and 8,600 in atmosphere—the highest ever reported Q’s at this frequency range and in these environments for any on-chip micro-scale resonator. The Q of ...

In order to provide scalability to quantum information processors utilizing trapped atoms or ions as quantum bits (qubits), the capability to address multiple individual qubits in a large array is needed. Micro-electromechanical systems (MEMS) technology can be used to create a flexible and scalable optical system to direct the necessary laser beams to multiple qubit locations. We developed bea...

deep beams are type of beams which their behavior is different from conventional beams because of their particular type of geometry. in this paper, the retrofitting of these beams is considered and 10 deep beams are tested experimentally and discussed about retrofitting methods. experimental studies indicate that the use of cfrp bands in the direction perpendicular to diagonal cracks in compari...

An optically thin resonator suspended over a substrate and illuminated with a laser forms an interference field that couples deflection of the resonator to absorption within it. For high enough laser powers, such resonators have been shown to be interferometrically transduced to stable oscillations due to the feedback between heating and deflection. The coupling between thermal stresses, deflec...

Optical vortex beams, generated by Diffractive Optical Elements (DOEs), are capable of creating optical traps and other multi-functional micromanipulators for very specific tasks in the microscopic scale. Using the Fibonacci sequence, we have discovered a new family of DOEs that inherently behave as bifocal vortex lenses, and where the ratio of the two focal distances approaches the golden mean...

The high voltage capability, compact size, and high output impedance of piezoelectric transformers makes them very attractive primary high voltage supplies for charged particle beam applications. This paper will present and contrast recent results utilizing piezoelectric transformers to accelerate electrons and ions, to produce x-rays and neutrons for imaging and active interrogation and to pro...

This paper describes the design and analysis of a particular micro-electromechanical-system (MEMS) micromirror device that can be used for an optical switching application. Analytical expressions for electrostatic torque and restoring torque of serpentine springs are derived. The performance of the proposed structure is compared with the existing structures having straight torsional beams. The ...

Selective Ga + ion implantation and miring by focused ion beam exposure and subsequent wet chemical etching is used to fabricate micro/nanomechanical elements in Si. Freestanding elements with a ~ 30 nm membrane thickness are made by controlled selective underetching between unexposed and exposed areas. Ultrahigh-frequency cantilever beams have been made with resonances in the tens of MHz range...

A finite element approximation is proposed for the dynamic analysis of two-dimensional (2D) lattice materials. The unit cell is modeled by means of a defined number of shear deformable micro-beams. The main innovative feature concerns the presence of a microstructure-dependent scale length, which allows the consideration of the so called size-effect that can be highly relevant, due to the chara...