摘要:
A fast injection optical switch is disclosed. The optical switch includes a thyristor having a plurality of layers including an outer doped layer and a switching layer. An area of the thyristor is configured to receive a light beam to be directed through at least one of the plurality of layers and exit the thyristor at a predetermined angle. At least two electrodes are coupled to the thyristor and configured to enable a voltage to be applied to facilitate carriers from the outer doped layer to be directed to the switching layer. Sufficient carriers can be directed to the switching layer to provide a change in refractive index of the switching layer to redirect at least a portion of the light beam to exit the thyristor at a deflection angle different from the predetermined angle.
摘要:
A technique is provided for forming a molecule or an array of molecules having a defined orientation relative to the substrate or for forming a mold for deposition of a material therein. The array of molecules is formed by dispersing them in an array of small, aligned holes (nanopores), or mold, in a substrate. Typically, the material in which the nanopores are formed is insulating. The underlying substrate may be either conducting or insulating. For electronic device applications, the substrate is, in general, electrically conducting and may be exposed at the bottom of the pores so that one end of the molecule in the nanopore makes electrical contact to the substrate. A substrate such as a single-crystal silicon wafer is especially convenient because many of the process steps to form the molecular array can use techniques well developed for semiconductor device and integrated-circuit fabrication.
摘要:
A method for controlling catalyst nanoparticle positioning includes establishing a mask layer on a post such that a portion of a vertical surface of the post remains exposed. The method further includes establishing a catalyst nanoparticle material on the mask layer and directly adjacent at least a portion of the exposed portion of the vertical surface.
摘要:
Methods of fabricating a suspended mono-crystalline structure use annealing to induce surface migration and cause a surface transformation to produce the suspended mono-crystalline structure above a cavity from a heteroepitaxial layer provided on a crystalline substrate. The methods include forming a three dimensional (3-D) structure in the heteroepitaxial layer where the 3-D structure includes high aspect ratio elements. The 3-D structure is annealed at a temperature below a melting point of the heteroepitaxial layer. The suspended mono-crystalline structure may be a portion of a semiconductor-on-nothing (SON) substrate.
摘要:
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.
摘要:
A method of positioning a catalyst nanoparticle that facilitates nanowire growth for nanowire-based device fabrication employs a structure having a vertical sidewall formed on a substrate. The methods include forming the structure, forming a targeted region in a surface of either the structure or the substrate, and forming a catalyst nanoparticle in the targeted region using one of a variety of techniques. The techniques control the position of the catalyst nanoparticle for subsequent nanowire growth. A resonant sensor system includes a nanowire-based resonant sensor and means for accessing the nanowire. The sensor includes an electrode and a nanowire resonator. The electrode is electrically isolated from the substrate. One or more of the substrate is electrically conductive, the nanowire resonator is electrically conductive, and the sensor further comprises another electrode. The nanowire resonator responds to an environmental change by displaying a change in oscillatory behavior.
摘要:
A hybrid-scale electronic circuit, an internal electrical connection and a method of electrically interconnecting employ an interconnect having a tapered shape to electrically connect between different-scale circuits. The interconnect has a first end with an end dimension that is larger than an end dimension of an opposite, second end of the interconnect. The larger first end of the interconnect connects to an electrical contact of a micro-scale circuit and the second end of the interconnect connects to an electrical contact of a nano-scale circuit.
摘要:
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.
摘要:
A nanowire-based device and method employ removal of residual carriers. The nanowire-based device includes a semiconductor nanowire having a semiconductor junction, and a residual carrier sink. The residual carrier sink is located at or adjacent to the semiconductor nanowire near the semiconductor junction and employs one or both of enhanced recombination and direct extraction of the residual carriers. The method includes providing a semiconductor nanowire, forming a semiconductor junction within the semiconductor nanowire, forming a residual carrier sink, and removing residual carriers from the semiconductor junction region using the residual carrier sink.
摘要:
A semiconductor device which has controlled optical absorption includes a substrate, and a semiconductor layer supported by the substrate. The semiconductor has variable optical absorption at a predetermined optical frequency in relationship to a bandgap of the semiconductor layer. Also included is a strain application structure coupled to the semiconductor layer to create a strain in the semiconductor layer to change the semiconductor bandgap.