Abstract:
A security device that elicits at least one dynamic response upon acceleration, or upon change of orientation with respect to gravity, wherein the dynamic response continues after cessation of the acceleration or the change of orientation. In addition, the dynamic response can be optical, such that it is visually observable by an unaided human eye. Alternatively, the response can be machine readable. In some cases, the dynamic response has duration of from about 0.01 s to about 100 s, or from about Is to about 10s.
Abstract:
A photonic crystal, and a photonic device having such a photonic crystal, configured by changing its physical geometry in at least one region to alter light propagation and/or confinement. The configuring means may include electrostrictive, piezoelectric or magnetostrictive components of the photonic crystal, or an actuation device affixed to the photonic crystal.
Abstract:
This disclosure provides systems, methods and apparatus for incorporating tip-gap adjustment features (TGAF) in actuators of shutter assemblies. The TGAF are incorporated into a drive beam of the actuator during the formation of the shutter assembly over a mold. The TGAF are configured such that they develop a mechanical stress or stress gradient. When the shutter assembly is released from the mold, the stress or stress gradient in the TGAF bend the drive beam such that a tip-gap between the drive beam and a load beam of the actuator is reduced. The reduced tip-gap, in turn, reduces an actuation voltage needed to actuate the shutter assembly.
Abstract:
Apparatus and method for high-power multi-function millimeter-wavelength (THz-frequency) signal generation using OPO and DFG in a single cavity. In some embodiments, the OPO-DFG cavity includes an optical parametric oscillator (OPO) non-linear material that receives pump light I P having pump-light frequency and generates two different lower intermediate frequencies of light - an OPO-signal beam I S and a spatially/temporally overlapping OPO-idler beam I I . A difference-frequency generator non-linear material then receives the two intermediate-frequency beams II and IS, and the DFG then generates a THz-frequency output signal that has a frequency equal to the difference between the two intermediate frequencies. In some embodiments, a single-piece crystal of non-linear material is used for both OPO and DFG functions. Some embodiments use a bow-tie ring having four mirrors that define the optical path: an IP-beam-entry mirror, an IP-light-extraction mirror to remove unconverted I P -beam, an II-beam-extraction mirror, and an IS-beam-extraction mirror, and a fifth I THz -beam-extraction mirror.
Abstract:
A light-scattering photonic material is disclosed having a matrix defining a plurality of disordered voids. The material may be reversibly responsive to an external stimulus, exhibiting reversible first and second optical effects. The material may be a thin film material.
Abstract:
A microelectromechanical (MEMS) device (1300) includes a substrate (20), a movable element (1340) over the substrate (20), and an actuation electrode (142) above the movable element (1340). The movable element (1340) includes a deformable layer (1302) and a reflective element (1314), The deformable layer (1302) is spaced from the reflective element (1314).
Abstract:
Sicherheitselement (1, 1', 1' ', 1' ' ', 1 ' ' ' ') zur Kennzeichung eines Sicherheitsdokuments (100), insbesondere einer Banknote, eines Wertpapiers oder eines Papierdokuments, mit mindestens einem elektrisch steuerbaren Anzeigeelement (16) und mindestens einer, das mindestens eine Anzeigeelement steuernden piezoelektrischen Energiequelle (Ia). Das Sicherheitselement ist durch einen flexiblen mehrschichtigen Folienkörper gebildet, welcher das mindestens eine elektrisch steuerbare Anzeigeelement enthaltend eine Anzeigeschicht (5) mit in einem elektrischen Feld ausrichtbaren Flüssigkristallen und die mindestens eine, das mindestens eine Anzeigeelement steuernde piezoelektrische Energiequelle mit mindestens einer Schicht (4) aus piezoelektrischem Material umfasst, wobei das Sicherheitselement in Richtung senkrecht zur Ebene des Folienkörpers eine Dicke von maximal 70 μm aufweist.
Abstract:
A microphotonic device (2, 24) is provided. The microphotonic device includes a membrane structure (6) that can experience strain. A waveguide element is formed on the membrane structure so that when the membrane structure is strained, the geometrical structure of the waveguide element is turned to a selective amount. Preferably, the membrane comprises a sub-micron SiO2 layer and is deformed through piezoelectric P2T actuator (4). Examples of waveguide elements are microring resonator (8), microracetrack resonator (30, 34), 1D and 2D photonic crystals.
Abstract:
An optical filter (100), including a Bragg grating (102), is compression tuned such that when under one compressional load (or no load) the grating (102) has a first profile and under a second compressional load the grating (102) has a second profile. One application is to allow the grating filter function to be parked optically between channels of a WDM or DWDM optical system.
Abstract:
The transmission response of an optical filter (BSF) is changed by modifying the temperature thereof. The filter can be adjusted by mechanical pressure or traction. Said filter can be used to create add-drop-continue modules (ZT1,BSF, ZI2) that are suitable for add-drop operations and drop-continue operations. Said optical filters can also be used to create cross-connect modules.