We report the production of electron vortex beams carrying large orbital angular momentum (OAM) using micro-fabricated spiral zone plates. A series of the spherical waves, focussing onto different positions along the propagating direction of the electron beam, were observed. The nth order vortex beam has an OAM n times larger than that of the first-order vortex beam. We observed an electron vor...

Micro-stereolithography ( SL) is capable of fabrication of highly complex three-dimensional (3D) microstructures by selectively photo-induced polymerization from the monomer resin. However, during the evaporative drying of structures from liquid resin, the 3D microstructures often collapse due to the capillary force. In this work, a theoretical model is developed to analyze the deflection and a...

We propose and demonstrate trapping and rotation of microparticles and biological samples with a moiré-based rotating optical tweezers. We show that polystyrene beads, as well as Escherichia coli cells, can be rotated with ease, while the speed and direction of rotation are fully controllable by a computer, obviating mechanical movement or phase-sensitive interference. Furthermore, we demonstra...

The refraction of a localized narrow beam is significantly different from that of a plane wave. As the beam width decreases to be in the order of the wavelength, the refraction behavior deviates noticeably from Snel’s law, and when the width of a light beam is smaller than about one fifth of the wavelength of the incident light, finite-difference time-domain simulations demonstrate that refract...

The ability to integrate micro-optical elements with movable structures and microactuators has opened up many new opportunities for optical and optoelectronic systems"2. It allows us to manipulate optical beams more effectively than conventional methods, and is scalable to large optical systems. Optical MEMS (MicroElectroMechanical Systems) have applications in di~play~"'~, sensing6, and optica...

The ability to integrate micro-optical elements with movable structures and microactuators has opened up many new opportunities for optical and optoelectronic systemsI2. It allows us to manipulate optical beams more effectively than conventional methods, and is scalable to large optical systems. Optical MEMS (MicroElectroMechanical Systems) have applications in display, sensing, and optical dat...

Optotune has developed an Electroactive Polymer Actuator-based solution to move a diffuser and drastically reduce the speckle contrast of Laser beams: the LSR-5-17 (Laser Speckle Reducer). With its integrated miniaturized electronics for HV generation and motion control, the LSR-5-17 provides a compact 27 x 21 x 6mm solution with a simple 5V micro USB interface for power supply. A miniaturized ...

The modelling strategy and simulation of flexible components of MEMS are addressed in this article. A newly developed Cosserat Rod Element (CRE) approach is employed to model the nonlinear dynamic equations of motion for micro resonators. Models constructed using this approach seek to capture the most significant characteristics of a microstructure in a few variables governed by a few ordinary ...

Abstract. This paper discusses the use of multibody dynamics, augmented by the direct implementation of nonlinear finite element beams and significantly shells, to perform the coupled structural and fluid-dynamics analysis of flapping wing Micro-Aerial Vehicles. The implementation of the shell formulation in a free general-purpose multibody solver is described and validated. The solver, coupled...

C. Griffin a) , E. Gu, H.W. Choi, C. W. Jeon, J.M. Girkin, and M.D. Dawson Institute of Photonics, University of Strathclyde, 106 Rottenrow, Glasgow G4 0NW, United Kingdom G. McConnell, Centre for Biophotonics, University of Strathclyde 27 Taylor Street, Glasgow G4 0NR, United Kingdom Abstract The recent development of high-density, two-dimensional arrays of micrometer-sized InGaN/GaN light-emi...