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Optical techniques are widely used for trapping of particles. One such technique involves the use of passive diffractive optical elements. Recently, a novel passive diffractive optical element, a spiral phase Fresnel zone plate (FZP) was proposed [1]. In this paper, we present an improved version, of the earlier reported element, that will allow for a compact optical configuration for generation of...
A hybrid two-axis scanning micromirror combining electrostatic and electrothermal actuators was fabricated using SOIMUMPs. Experimental evaluation shows the device is capable of scan in two orthogonal directions and produces a rectangular raster-scan pattern.
We report an optical phased array (OPA) using high-contrast-grating (HCG) as an electrostatically actuated mirror for the purpose of free space fast beamsteering. In this paper, several attractive properties of HCG mirror are introduced such as single material, high reflectance along a wide bandwidth and low-mass inertia and the fabrication result is shown. ±10° × 10° with 2° beam width is observed...
This paper presents the design, fabrication and characterization of a high-fill-factor tip-tilt-piston (TTP) micromirror which employs four symmetrical lateral-shift-free (LSF) piezoelectric actuators. Lead zirconate titanate (PZT) is the piezoelectric material deposited using a sol-gel process. The measured resonant frequencies of the fabricated micromirror are 990 Hz (piston) and 1450 Hz (rotation),...
We report on the hydrothermal synthesis of ZnO nanorod clusters by localized optical heating from the focused laser beam. The spatial distribution of the nanorods and their growth rate can be easily controlled.
A resonant biaxial comb-actuated 7mm-MEMS scanning mirror with tripod-suspension is developed to provide omnidirectional scanning in an automotive time-of-flight LIDAR sensor application. Wafer level vacuum packaging technology is applied to enable circular scanning at 550Hz at large tilt angle.
We demonstrated generation of various optical trap spots using a MEMS scanning micromirror with optical tweezers. By controlling the actuation voltage pattern, various focused laser lines and separate laser spots were achieved.
We propose a lens fabrication process for reaction injection molding of elastomeric micro-lenses. The versatile and flexible process allows manufacturing a broad spectrum of lens shapes, including compound achromatic lenses, entirely consisting of PDMS.
A miniature tunable multi-blade iris diaphragm driven by microelectromechanical systems (MEMS) is developed. The diameter of the iris diaphragm aperture is experimentally demonstrated to be able to adjust continuously from 0.45 mm to 1.56 mm.
An integrated optical technique for interrogating the height of a suspended micro-electro-mechanical systems (MEMS) beam is demonstrated. This technique is highly sensitive, and capable of using WDM techniques to interrogate the height information of large arrays of beams. Our experimental results show a 7 dB change in the transmitted optical power when the beam height changes by 100 nm. It is predicted...
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