Abstract:
A display device has an insulated basic substrate (1). A plurality of light waveguides (Y n ) are arranged on the basic substrate in parallel to each other. A plurality of signal wires is arranged in parallel and in a manner to be crossed with the light waveguides (Y n ), respectively. A plurality of photoconductive layers (6) three-dimensionally are laid between the light waveguides (Y n ) and the signal wires (X n ) and directly connected with each light guiding portion (4) of the light waveguides (Y n ) at respective crosspoints between the light waveguides (Y n ) and the signal electrodes (X n ). A plurality of pixel electrodes (5) provided are to be connected with the photoconductive layers (6), respectively. An insulated opposed substrate located in opposition to the basic substrate (1) with a display medium (13) therebetween and having an opposed electrode on the surface opposed to the basic substrate (1). And the relation among an index of refraction nl of the light guiding portion (4), an index of refraction n₂ of the photoconductive layer (6), and an angle of incidence ϑ of light given from the light guiding portion (4) to the photoconductive layer (6) meeting the following expression of n₁ sin ϑ
Abstract:
It is possible to utilize changes in the complex effective refractive index caused by bringing a metal membrane in close proximity to the core of an optical waveguide to form many devices. The invention described herein provides structures and processes that do 50, the structure comprising a substrate (10), a lower cladding (14), a waveguide core (16), a removable upper cladding (18) which supports a metal membrane (22), and an electrode (12) for deflecting said membrane. Switchable devices using this structure include, but are not limited to, polarizers, mode converters, optical switches, Bragg devices, directional couplers and channel waveguides.
Abstract:
There is provided a wearable display comprising a light source emitting light of a first wavelength; a first SBG device having a front side and a rear side; first and second transparent plates sandwiching said SBG device; independently switchable transparent electrode elements applied to the opposing surfaces of said transparent plates, a means for spatio-temporally modulating light from the light source to provide image light and a means for coupling the image light into the light guide formed by the two transparent plates and the SBG device. The SBG device comprises a multiplicity of selectively switchable grating regions. The SBG device diffracts image into the pupil of an eye.
Abstract:
Methods of attenuating, delaying the phase, and otherwise controlling an optical signal propagating along a waveguide are provided. According to one method, a variable optical attenuator structure is provided comprising a waveguide core (10), a cladding (20), an electrooptic polymer (30), and a set of control electrodes (40). The core (10), the cladding (20), and the electrooptic polymer (30) are configured such that an increase in the index of refraction of the polymer (30) causes a substantial portion of an optical signal propagating along the waveguide core (10) to couple into a relatively high index region (32) of the electrooptic polymer (30) above the waveguide core (10), so as to inhibit return of the coupled signal to the waveguide core (10). Another embodiment of the present invention introduces a phase delay in the coupled optical signal and permits return of the coupled signal to the waveguide core (10). An additional embodiment contemplates the use of a ridge waveguide structure to enable control of the optical signal.
Abstract:
An embodiment of a waveguide has a Brillouin bandwidth, and includes cladding and a core. The cladding includes first layers of a first material, each first layer having a physical characteristic of approximately a first value, and includes second layers of a second material, each second layer having the physical characteristic of approximately a second value, the second layers alternating with the first layers such that the Brillouin bandwidth is wider than the Brillouin bandwidth would be if the cladding excluded the first layers or excluded the second layers. For example, the first and second cladding layers can be formed from different materials, or can be formed having different values of a physical characteristic such as thickness, acoustic velocity, or index of refraction. Such a waveguide can facilitate alignment of the waveguide's optical bandwidth with the waveguide's Brillouin bandwidth because the Brillouin bandwidth is widened compared to conventional waveguides.