The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present simulations showing how light scattered by isolated particles increases by a factor 10, when they are placed in photonic crystal membranes. Exploiting this effect, single nano-particles have been detected with an optical microscope.
A conical micromirror is shown to increase the signal from fluorescent molecules within a collocated subwavelength metal aperture by 5×. Large-scale integration (75,000 miromirrors/aperture pairs) is demonstrated.
Implementation of a MEMS-based Wolter type-I optic that is suitable for future planetary exploration missions is described. A devised alignment system permits independent adjustment of position and angular settings of x-ray mirrors.
We investigate the reflow of non-circular, i.e., triangular and square, shaped pillars to fabricate nano-scale solid immersion lenses (SILs). Electron beam lithography (EBL) and thermal reflow are the core of the fabrication process. For the optical characterization at λ = 642 nm, nano-SILs are replicated on a transparent substrate by soft lithography. The focal spots produced by the nano-SILs show...
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...
We present a novel fabrication method of a two-dimensional forward optical scanner with integrated microlens. Glass microlens and electrical isolation blocks were integrated with silicon XY-stage using thermal reflow process. Measured scan angles in X and Y directions at resonance were ±4.9° and ±5.0°, respectively, at atmospheric pressure.
We report an independently-addressed micro tunable cat's eye retro-reflector array. The device aims at serving as the ID tag in an optical identification system, hopefully a superior alternative to the current RFID systems. Dynamic images have been successfully generated by the tunable cat's eye array.
A single-pixel spectral line imager based on a highspeed MEMS grating scanner is demonstrated to possess the capability of resolving 104 spectral bands and 250 spatial pixels. Delauney Triangulation is used in the signal processing to correct the spectral image distortions.
The ion image sensor was invented. The device enables two dimensional visualization of both the ion and optical imaging of chemical activity of solutions and cell activity. The CMOS device consists of an array of CCDs covered with functionalized membrane. Changes in the concentration and two dimensional distributions of several ions are detected by charge accumulation. We have recently reported on...
Most optical systems utilize refractive lenses to focus light. These lenses have low transmission and suffer chromatic aberration because the refractive index is a function of wavelength. Focusing light by reflective curved surfaces (e.g., spherical mirrors) could address these two issues. However, this is hard to implement in micro-optical systems since the imager, with similar dimensions to other...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.