摘要:
Various embodiments of the present invention are directed to surface-plasmon-enhanced electromagnetic-radiation-emitting devices and to methods of fabricating these devices. In one embodiment of the present invention, an electromagnetic-radiation-emitting device comprises a multilayer core, a metallic device layer, and a substrate. The multilayer core has an inner layer and an outer layer, wherein the outer layer is configured to surround at least a portion of the inner layer. The metallic device layer is configured to surround at least a portion of the outer layer. The substrate has a bottom conducting layer in electrical communication with the inner layer and a top conducting layer in electrical communication with the metallic device layer such that the exposed portion emits surface-plasmon-enhanced electromagnetic radiation when an appropriate voltage is applied between the bottom conducting layer and the top conducting layer.
摘要:
A photonic apparatus and system employ a plurality of nanowires distributed in a low-index optical waveguide. The plurality of nanowires collectively one or more of produces, enhances, modulates and detects an optical field. The low-index optical waveguide confines the optical field in a vicinity of the plurality of nanowires. The photonic system includes a circuit to one or more of electrically bias the plurality of nanowires and collect electrons produced in the plurality of nanowires.
摘要:
Various embodiments of the present invention are directed to methods for coupling semiconductor-based photonic devices to diamond. In one embodiment of the present invention, a photonic device is optically coupled with a diamond structure. The photonic device comprises a semiconductor material and is optically coupled with the diamond structure with an adhesive substance that adheres the photonic device to the diamond structure. A method for coupling the photonic device with the diamond structure is also provided. The method comprises: depositing a semiconductor material on the diamond structure; forming the photonic device in the semiconductor material so that the photonic device couples with the diamond structure; and adhering the photonic device to the diamond structure.
摘要:
A multilayer device includes an electronic device layer, a first electrode associated with the electronic device layer, an optical layer, a second electrode associated with the optical layer, and an insulator layer provided between the first and second electrodes. The first and second electrodes are capacitively coupled to each other to facilitate electrical communication between the electronic device layer and the optical layer through transmission of an electrical signal between the first and second electrodes. The electrical signal may be transmitted through the insulator layer. In addition, the electronic device layer and the optical layer may be in electrical communication with each other through capacitive coupling of the first electrode and the second electrode.
摘要:
A nano-anemometer is formed by growing a nanowire to span an open area between a pair of electrodes. The nanowire is coupled to a sensing apparatus to form a hot-wire nano-anemometer.
摘要:
A nano-enhanced Raman scattering (NERS)-active structure includes a substrate, a monolayer of nanoparticles disposed on a surface of the substrate, and a spacer material surrounding each nanoparticle in the monolayer of nanoparticles. The monolayer of nanoparticles includes a first plurality of nanoparticles and a second plurality of nanoparticles. The nanoparticles of the second plurality are interspersed among the first plurality and exhibit a plasmon frequency that differs from any plasmon frequency exhibited by the first plurality. Also described are a method for forming such a NERS-active structure and a NERS system that includes a NERS-active structure, an excitation radiation source, and a detector for detecting Raman scattered radiation.
摘要:
A SERS-active structure is disclosed that includes a substrate and at least two nanowires disposed on the substrate. Each of the at least two nanowires has a first end and a second end, the first end being attached to the substrate and the second end having a SERS-active tip. A SERS system is also disclosed that includes a SERS-active structure. Also disclosed are methods for forming a SERS-active structure and methods for performing SERS with SERS-active structures.
摘要:
A method for growing a crystalline layer that includes a first material on a growth surface of a crystalline substrate of a second material, wherein the first material and the second material have different lattice constants. A buried layer is generated in the substrate such that the buried layer isolates a layer of the substrate that includes the growth surface from the remainder of the substrate. The second material is then deposited on the growth surface at a growth temperature. The isolated layer of the substrate has a thickness that is less than the thickness at which defects are caused in the crystalline lattice of the first material by the second material crystallizing thereon. The buried layer is sufficiently malleable at the growth temperature to allow the deformation of the lattice of the isolated layer without deforming the remainder of the substrate. The present invention may be utilized for growing III-V semiconducting material layers on silicon substrates. In the case of silicon-based substrates, the buried layer is preferably SiO2 that is sufficiently malleable at the growth temperature to allow the deformation of the isolated substrate layer.
摘要:
The present invention comprises a method of fabricating devices and circuits employing at least one heteroepitaxial layer under strain. The thickness of the heteroepitaxial layer is more than two times the calculated equilibrium critical thickness for an uncapped heteroepitaxial layer upon a crystalline substrate, based on previously known equilibrium theory for the uncapped layer. Subsequent to growth of the heteroepitaxial layer, the structure is processed at temperatures higher than the growth temperature of the heteroepitaxial layer.The strained heteroepitaxial layer (second layer) is epitaxially grown upon the surface of a first, underlaying crystalline layer, creating a heterojunction. Subsequently a third crystalline layer is deposited or grown upon the major exposed surface of the second, strained heteroepitaxial layer. The preferred manner of growth of the third crystalline layer is epitaxial growth. The composition of the third crystalline layer must be such that upon deposition or growth, the third layer substantially continuously binds to the heteroepitaxial structure of the second layer. Subsequent to growth of the at least three layer structure, the structure is processed at temperatures in excess of the growth temperature of the second heteroepitaxial layer. Presence of the third crystalline layer prevents the generation of a substantial amount of misfit dislocations between the first crystalline layer substrate and the second heteroepitaxial layer.
摘要:
A pre-processed substrate structure for a semiconductor device. A subcollector layer is spaced apart from a substrate by a dielectric. A relatively small, lightly-doped epitaxial feed-through layer extends through the dielectric between the substrate and the subcollector. A transistor constructed over the subcollector has very low collector-to-substrate capacitance. A plurality of devices on a common substrate are electrically isolated from each other by channel stops formed in the substrate around each device.