Abstract:
Systems and methods in accordance with various embodiments of the invention implement textured metasurfaces that can provide for enhanced thermal emissivity. In one embodiment, a lightweight solar power generator includes: at least one photovoltaic cell including a photovoltaic material; at least one concentrator, configured to focus incident solar radiation onto the photovoltaic material; and at least one textured metasurface characterized by its inclusion of a plurality of microstructures, each having a characteristic lateral dimension of between approximately 1 μm and approximately 100 μm patterned thereon; where the at least one textured metasurface is disposed such that it is in thermal communication with at least some portion of the lightweight solar power generator that generates heat during the normal operation of the lightweight solar power generator, and is thereby configured to dissipate heat generated by the at least some portion.
Abstract:
A plasmonic device has a transparent conducting oxide (TCO) waveguide and a tunable voltage applied across the TCO and a metal layer for modulating an input optical signal. The plasmonic device comprises a substrate, the metal layer on the substrate and having a grooved channel, a dielectric layer on the metal layer and in the grooved channel, and the transparent conducting oxide (TCO) on the dielectric layer and in the grooved channel.
Abstract:
This disclosure relates to structures for the conversion of light into energy. More specifically, the disclosure describes devices for conversion of light to electricity using ordered arrays of semiconductor wires coated in a wider band-gap material.
Abstract:
A method and apparatus for replicating patterns with a resolution well below the diffraction limit, uses broad beam illumination and standard photoresist. In particular, visible exposure (λ = 410 nm) of silver nanoparticles in close proximity to a thin film of g-line resist (AZ 1813) can produce selectively exposed areas with a diameter smaller than λ/20. The technique relies on the local field enhancement around metal nanostructures when illuminated at the surface plasmon resonance frequency. The method is extended to various metals, photosensitive layers, and particle shapes.
Abstract:
A space-based solar power station, a power generating satellite module and/or a method for collecting solar radiation and transmitting power generated using electrical current produced therefrom is provided. Each solar power station includes a plurality of satellite modules. The plurality of satellite modules each include a plurality of modular power generation tiles including a photovoltaic solar radiation collector, a power transmitter and associated control electronics. The power transmitters can be coordinated as a phased array and the power generated by the phased array is transmitted to one or more power receivers to achieve remote wireless power generation and delivery. Each satellite module may be formed of a compactable structure capable of reducing the payload area required to deliver the satellite module to an orbital formation within the space-based solar power station.
Abstract:
A virtual substrate includes a handle support and a strain-relieved single crystalline layer on the handle support. A method of making the virtual substrate includes growing a coherently-strained single crystalline layer on an initial growth substrate, removing the initial growth substrate to relieve the strain on the single crystalline layer, and applying the strain- relieved single crystalline layer on a handle support.
Abstract:
Systems and methods for manipulating light with tunable ferroelectric photonic devices. Devices having tunable properties that exhibit photonic bandgap behavior are fabricated from ferroelectric materials. Apparatus is provided to apply tuning signals to the ferroelectric material using one or more of electric fields, mechanical forces, optical fields, and thermal fields. Control circuitry is provided to generate the control signals needed to apply the tuning signals. Input and output ports are provided to allow input signals to be received and to provide output signals. In some cases, a feedback loop is provided to use a portion of the output signal as a diagnostic signal for control of the operation of the device within an acceptable range. It is expected that ferroelectric photonic devices operating according to principles of the invention will be useful for a wide variety of applications, including optical switching, optical modulation, optical computing, and performing logic optically.
Abstract:
Narrowband light filters, and methods of manufacturing such light filters, are provided. A narrowband light filter may include at least two electrically conductive bodies, an electrically conductive thin film layer disposed between the at least two electrically conductive bodies, at least one protective oxide layer disposed on the thin film layer and electrically conductive bodies, and at least one slit disposed through the electrically conductive thin layer. In various embodiments, the electrically conductive bodies give the narrowband light filter a mirrored structure in exemplary embodiments of the invention. The narrowband filters may also include one or more slits. Multiple slits may be configured to make the narrowband filtration polarization-independent. A plurality of narrowband light filters may be configured into pixel arrays. Pixel arrays may also be used in multispectral or hyperspectral imaging apparatus and techniques.