Abstract:
A method for fabricating an optical modulator includes forming n-type layer, a first oxide portion on a portion of the n-type layer, and a second oxide portion on a second portion of the n-type layer, patterning a first masking layer over the first oxide portion, portions of a planar surface of the n-type layer, and portions of the second oxide portion, implanting p-type dopants in the n-type layer to form a first p-type region and a second p-type region, removing the first masking layer, patterning a second masking layer over the first oxide portion, a portion of the first p-type region, and a portion of the n-type layer, and implanting p-type dopants in exposed portions of the n-type layer, exposed portions of the first p-type region, and regions of the n-type layer and the second p-type region disposed between the substrate and the second oxide portion.
Abstract:
A phase shifter includes an optical waveguide, a plurality of impurity regions and a plurality of electrodes. The optical waveguide receives an optical input signal and outputs an optical output signal. The impurity regions include respective charge carriers. The impurity regions are disposed in contact with the optical waveguide at respective contact surface, where at least one of the contact surfaces has a zigzag pattern. The electrodes are connected to the respective impurity regions. Application of an electrical signal to at least one of the electrodes phase-shifts the optical output signal with respect to the optical input signal. Therefore, the phase shifter may efficiently vary a magnitude of the phase shift of the optical output signal.
Abstract:
Method and apparatus are provided for displaying an image to a viewer with reduced visual artifacts. The apparatus comprises a display panel for forming the image using an array of pixels with distributed active regions, and a viewing arrangement optically situated between the display panel and the viewer for transferring the image formed on the display panel to the viewer with limited angular pixel subtense. The distributed active regions of the pixels are desirably divided into at least two simultaneously switched portions at least partly separated by or surrounding a significant portion of the non-switchable region. First order spatial harmonics and associated artifacts are reduced by the distributed apertures and second order and higher harmonics are reduced by limiting the pixel subtense angle seen by the viewer. A significant reduction in visual artifacts arising from the periodic structure of the display panel is obtained.
Abstract:
The present invention relates to a device for velocity matching between optical and electrical signals in a waveguide structure comprising first waveguiding means for optical signals and second waveguiding means for electrical signals. The cross-section of the waveguide structure varies dielectrically in the direction of the propagation.
Abstract:
A method to operate a display screen D in at least two operating modes, B1 for a free viewing mode and B2 for a restricted viewing mode, comprising the following steps: arrangement of a switchable optical element immediately in front of a display screen as seen in a viewer's viewing direction, the said optical element ensuring switching between the at least two operating modes B1 and B2, presentation of an image content on the display screen, wherein the optical element contains a multitude of louvers, and wherein the optical effect of the louvers can be changed between transparent (B1) and luminous (B2) due to the fact that at least every twentieth louver contains triggerable layers that can be switched to be either transparent or brightly self-luminous.
Abstract:
A method for fabricating an optical modulator includes forming n-type layer, a first oxide portion on a portion of the n-type layer, and a second oxide portion on a second portion of the n-type layer, patterning a first masking layer over the first oxide portion, portions of a planar surface of the n-type layer, and portions of the second oxide portion, implanting p-type dopants in the n-type layer to form a first p-type region and a second p-type region, removing the first masking layer, patterning a second masking layer over the first oxide portion, a portion of the first p-type region, and a portion of the n-type layer, and implanting p-type dopants in exposed portions of the n-type layer, exposed portions of the first p-type region, and regions of the n-type layer and the second p-type region disposed between the substrate and the second oxide portion.
Abstract:
An array substrate of a TFT-LCD, comprising: a base substrate; gate lines and data lines formed on the substrate, the gate lines and the data lines crossing with each other to define a plurality of pixel units each of which comprises a thin film transistor, a first electrode layer and a second electrode layer, wherein the first electrode layer is separated from the second electrode layer through an insulation layer; the first electrode layer comprises a plurality of first electrodes separated by openings; the second electrode layer comprises a plurality of second electrodes separated by openings; the second electrodes comprise overlapping electrodes each of which completely overlaps with the first electrodes and non-overlapping electrodes whose edges are completely located within an region corresponding to the openings in the first electrode layer.
Abstract:
A system for generating signals for Raman vibrational analysis, particularly for a CARS microscope or spectroscope of an external specimen, the system comprising a a laser source apt to emit at least one fundamental optical pulse in a first band of fundamental frequencies comprising at least one first (ωf1) and one second (ωf2) fundamental frequencies; a second-harmonic (SH) generating system comprising at least one nonlinear optical crystal for converting said at least one fundamental optical pulse into at least two second-harmonic optical pulses, i.e. a first second-harmonic pulse at a first second-harmonic frequency (ωp) of the first fundamental frequency (ωf1) and a second second-harmonic pulse at a second second-harmonic frequency (ωs) of the second fundamental frequency (ωf2), said second second-harmonic frequency being other than the first second-harmonic frequency, and a Raman vibrational analysis apparatus apt to receive said first and second second-harmonic pulses and direct them toward said specimen.According to an embodiment, the SH system comprises two nonlinear optical crystals, each including a ferroelectric crystal with periodic space-modulation of the sign of the optical susceptibility.In a different embodiment, the SH system comprises a ferroelectric crystal with aperiodic space-modulation of the sign of nonlinear optical susceptibility, with a period varying along the optical path of said at least one fundamental optical pulse, said crystal being apt to generate said first and second second-harmonic pulses.
Abstract:
A method of fabrication of an electrooptical device comprises depositing a colloid system of anisometric particles onto at least one electrode and/or onto at least one substrate and/or onto at least one layer of an isotropic or anisotropic material to form at least one layer of an electrooptical material, externally aligning the colloid system to form a preferred alignment of the colloid system particles, drying the colloid system, and forming at least one electrode and/or at least one layer of an isotropic or anisotropic material on at least a portion of the layer of the electrooptical material.
Abstract:
An electrode applicable in liquid crystal display (LCD), an array substrate, a display panel, and a display device are provided. The electrode applicable in LCD includes a plurality of electrode comb teeth with a slit therebetween, adjacent electrode comb teeth being connected to each other at one end of each comb tooth; the other ends of the adjacent electrode comb teeth forming an opening, at least one protrusion being provided between the adjacent electrode comb teeth at the opening end; and the protrusion being connected to the electrode comb tooth.