Abstract:
An integrated optical device (10) has a waveguide (18) whose optical mode is modulated by a PIN diode defined across the waveguide, the diode being defined by an area of p-type doping (24) to one side of the waveguide and n-type doping (26) to the other, the separation (30) of the n-type doping from the waveguide being greater than the separation (28) of the p-type doping from the waveguide. It is preferable for the n-type diode rule (30) to be at least 1.5 times the p-type diode rule (28), and more preferably at least twice. In this way, the best advantage of the effect is obtained. A ratio of between three and four times offers the best results. A ratio of four times, or a total n-type and p-type diode rule of less than 40µm is preferred in order to limit the size of the intrinsic region and hence its resistance.
Abstract:
The invention relates to a monostable chiral-smectic active matrix display containing a liquid crystal layer between two substrates which are externally connected to electrodes. The layers adjacent to the liquid crystal layer or the layer systems of the two substrates between the liquid crystal layer and the electrodes can be distinguished from each other by at least one physical and/or chemical property.
Abstract:
A multi-layer device comprising a first substrate, a first electrically conductive layer on a surface thereof, and a first current modulating layer, the first electrically conductive layer having a sheet resistance to the flow of electrical current through the first electrically conductive layer that varies as a function of position.
Abstract:
The present invention provides for polarization independence in electrooptic waveguides. Specifically, in accordance with one embodiment of the present invention, an electrooptic waveguide for an optical signal is provided. The waveguide comprises a plurality of control electrodes, an optical waveguide core defining a primary axis of propagation, and an electrooptic cladding at least partially surrounding the core. The control electrodes are positioned to generate a contoured electric field across the cladding. The cladding is poled along a poling contour. The contoured electric field and/or the poling contour are asymmetric relative to a plane intersecting the waveguide core and extending along the primary axis of propagation. The electrooptic cladding defines at least two cladding regions on opposite sides of the waveguide core.
Abstract:
The invention relates to an active matrix display having an asymmetrically structured cell containing a monostable liquid crystal domain, wherein the chiral smectic liquid crystal mixture has phase sequence I-N*-SmC*, a spontaneous polarization in the range of a working temperature of and a pitch of >20 mu m in at least one temperature in the nematic phase, the divergence of the monostable position with respect to the direction of friction in the range of the working temperature of the display being less than 10 degrees. The liquid crystal mixture comprises at least one compound of substance classes (A) and (B): R -(-A -M )a(-A -M )b-(M -A )c-(M -A )d-R and contains in relation to the liquid crystal mixture 0.05 to 50 percent by weight of one or more compounds of substance class (C): R -M -(-A -M )a(-A -M )b-(M -A )c-(M -A )d-M -R , wherein R , R represent alkyl; X represents -O-; Y represents -O-; Z represents -OC(=O)-; (a) represents phenylene-1,4-diyl; (b) represents phenylene-1,4-diyl; (c) represents cyclohexane-1,4-diyl; R , R represent hydrogen; R , R represent hydrogen; A , A , A , A represent 1,4-phenylene; M , M , M , M represent a simple bond; M , M represent -OC(=O)- and a, b, c and d 0 or 1 with the proviso that 1 -M -) is a simple bond when exponent x is zero.
Abstract:
The invention provides an optical modulator module (15) by which a dip appearing in a frequency characteristic of a microwave from a DC component to a high-frequency component due to parasitic substrate modes can be reduced while maintaining the mechanical strength and facilitating handling of a substrate (1) and besides securing the long-term reliability without processing the substrate (1) itself. The optical modulator module (15) includes a substrate (1), an optical modulator (16) including an optical waveguide (2), a signal electrode (3), and a ground electrode (4), and a housing (5) in and to which the optical modulator (16) is accommodated and secured. The shape of a longitudinal section of a part of the optical modulator module (15) except for the substrate (1) itself, such as the housing (5) or electrodes, is asymmetrical with respect to a perpendicular line with which the portion of the signal electrode (3) which extends in parallel to the optical waveguide (2) is bisected in the longitudinal direction.
Abstract:
A liquid crystal display unit (100) has a liquid crystal layer (13), a specular surface reflection layer (14r), a polarizing layer (17) arranged at an observer side, a phase difference layer (18) arranged between the liquid crystal layer and the polarizing layer, and a light scattering layer (20A) provided at the observer side on the polarizing layer (17). The light scattering layer (20A) includes the scattering top surface having a rugged macro structure (22a) with the light scattering property and a rugged micro structure (22b) that is formed to be overlapped with the rugged macro structure and has a size smaller than an visible wavelength.