| Patent application number | Description | Published |
|---|
| 20080267243 | Composite material with proximal gain medium - An apparatus and related methods are described, the apparatus comprising a composite material layer configured to exhibit at least one of a negative effective permittivity and a negative effective permeability for radiation of at least one wavelength propagating therethrough. The apparatus further comprises a layer of gain material proximal to the composite material layer, the layer of gain material providing amplification for the propagating radiation. The layer of gain material is disposed within a laser cavity and pumped to a lasing condition for the laser cavity, the layer of gain material thereby providing gain-clamped amplification for the propagating radiation. | 10-30-2008 |
| 20090109516 | Modulation of electromagnetic radiation with electrically controllable composite material - An apparatus and related methods for modulating an electromagnetic radiation beam are described. A composite material is positioned in the path of the radiation beam, the composite material comprising a plurality of commonly oriented metallic first lines spaced apart by less than a wavelength of the radiation beam and a plurality of commonly oriented metallic second lines also spaced apart by less than that wavelength. The second lines are positioned in a crossing arrangement with the first lines, a crosspoint location being defined where each first line crosses each second line. An electrically programmable impedance memory element is positioned at each crosspoint location and is electrically coupled between the first and second lines corresponding to that crosspoint location, each impedance memory element having an electrically programmed state. The composite material modulates the radiation beam according to the electrically programmed states of the impedance memory elements. | 04-30-2009 |
| 20090110348 | Magnetically Activated Photonic Switches And Switch Fabrics Employing The Same - Various embodiments of the present invention are directed to photonic switches and switch fabrics employing the photonic switches. In one embodiment of the present invention, a photonic switch comprises a first waveguide disposed on a surface of a substrate in proximity to an opening in the substrate, and a second waveguide crossing the first waveguide and positioned in proximity to the opening in the substrate. The photonic switch includes a tunable microring resonator disposed on the surface of the substrate adjacent to the first waveguide and the second waveguide and configured with an opening aligned with the opening in the substrate. The photonic switch also includes a wire having a first end and a second end and configured to pass through the opening in the microring and the opening in the substrate. | 04-30-2009 |
| 20090190875 | Optical Modulator Including Electrically Controlled Ring Resonator - An optical modulator and related methods are described. In accordance with one embodiment, the optical modulator comprises a waveguide for guiding an optical signal, and further comprises a ring resonator disposed in evanescent communication with the waveguide for at least one predetermined wavelength of the optical signal. The optical modulator further comprises a semiconductor pnpn junction structure that is at least partially coextensive with at least a portion of a resonant light path of the ring resonator. The optical modulator is configured such that the semiconductor pnpn junction structure receives an electrical control signal thereacross. The electrical control signal controls a free carrier population in the resonant light path where coextensive with the pnpn junction structure. A resonance condition of the ring resonator at the predetermined wavelength is thereby controlled by the electrical control signal, and the optical signal is thereby modulated according to the electrical control signal. | 07-30-2009 |
| 20090245714 | Optical Resonator Tuning Using Piezoelectric Actuation - An optical resonator configured to be tuned using piezoelectric actuation, includes a core, the core being configured to transmit light; a piezoelectric layer; a first electrode and a second electrode. The piezoelectric layer is interposed between the first electrode and the second electrode. A voltage difference across the first and second electrodes alters a geometric dimension of the piezoelectric layer such that physical force is applied to the core and a resonant optical frequency of the resonator is changed. A method of utilizing mechanical stress to tune an optical resonator includes applying physical force to the resonator by subjecting a piezoelectric material to an electric field, the physical force changing a resonant frequency of the resonator. | 10-01-2009 |
| 20090257703 | Optical Device With A Graded Bandgap Structure And Methods Of Making And Using The Same - An optical device includes at least two materials forming a structure with a graded bandgap where photocarriers are generated. A first of the at least two materials has a larger concentration at opposed ends of the graded bandgap structure than a concentration of the first of the at least two materials at an interior region of the graded bandgap structure. The second of the at least two materials has a larger concentration at the interior region of the graded bandgap structure than the concentration of the second of the at least two materials at the opposed ends of the graded bandgap structure. | 10-15-2009 |
| 20090263076 | Charge-Based Memory Cell For Optical Resonator Tuning - An optical resonator configured to be tuned using a charge-based memory cell includes an optical cavity configured to transmit light and receive injected charge carriers; a charge-based memory cell in proximity to or within the optical cavity, the memory cell containing a number of trapped charges which influence the resonant optical frequency of the optical resonator. A method of tuning an optical resonator includes applying a voltage or current to a charge-based memory cell to generate a non-volatile charge within the memory cell, the nonvolatile charge changing a resonant frequency of the optical resonator. | 10-22-2009 |
| 20090268770 | Gain Clamped Optical Device For Emitting LED Mode Light - A gain clamped optical device includes a semiconductor stack and a resonant cavity configured to emit stimulated light. A window created in the optical device is configured to emit the stimulated light in an LED mode. | 10-29-2009 |
| 20090273293 | Light-emitting Diodes With Carrier Extraction Electrodes - One embodiment of the present invention relates to a light-emitting diode having one or more light-emitting layers, a pair of electrodes disposed on the light-emitting diode so that an operating voltage can be applied to generate light from the one or more light-emitting layers, and at least one external electrode in electronic communication with the one or more light-emitting layers. Applying an appropriate voltage to the at least one external electrodes at about the time the operating voltage is terminated extracts excess electrons from the one or more light-emitting layers and reduces the duration of electron-hole recombination during the time period over which the operating voltage is turned off. | 11-05-2009 |
| 20090277608 | Thermal Control Via Adjustable Thermal Links - An apparatus for thermal control includes a first component; a second component; an adjustable thermal link disposed between the first component and the second component; and a controller for selectively varying a thermal conductance of the adjustable thermal link. A method of controlling a temperature includes sensing a temperature of a first component; and adjusting a thermal conductance of an adjustable thermal link, the adjustable thermal link forming a thermal path between the first component and a second component; the thermal conductance of the adjustable thermal link being adjusted such that the temperature of the first component is controlled. | 11-12-2009 |
| 20100019252 | Nanowire-Based Light-Emitting Diodes and Light-Detection Devices With Nanocrystalline Outer Surface - Embodiments of the present invention are directed to nanowire ( | 01-28-2010 |
| 20100111462 | Ring Light Emitting Diode - An optical apparatus includes an optical resonator ring having at least one active region. The active region is configured to generate optical energy under an electrical stimulus. The optical apparatus also includes a corrugated plasmonic body disposed around at least a portion of the resonator ring and radiatively coupled to the active region. | 05-06-2010 |
| 20110094306 | Sensor Fabric for Shape Perception - A sensor fabric has a plurality of flakes of a flexoelectric material and electrodes as threads for connecting the flakes together. Each flake has at least one pair of opposite edges connected by two separate electrodes. When the sensor fabric is placed in contact with the surface of an object, the flake is bent along the contour of the object surface. The bending of the flexoelectric flake generates a polarization voltage between its opposite edges, which can be measured via the electrodes to determine the local surface contour of the object. | 04-28-2011 |
