摘要:
An apparatus for dynamically varying an optical characteristic of a light beam includes an optical element configured to receive a beam of light. The optical element includes at least one sub-wavelength grating formed of a plurality of lines. The apparatus includes at least one actuator connected to at least one component of the optical element and a controller for controlling the at least one actuator to dynamically vary a characteristic of the beam of light that is at least one of emitted through and reflected from the optical element.
摘要:
A pattern recognition system includes an active media, an input system, and a sensing system. The active media is such that initial states respectively evolve over time to distinguishable final states. The input system establishes in the active media in an initial state corresponding to an input pattern, and the sensing system measures the media at separated locations to identify of which of the final states the media has after an evolution time. The identification of the final state indicates a feature of the input pattern.
摘要:
A memristive device is disclosed herein. The device includes a first electrode, a second electrode, and an active region disposed between the first and second electrodes. At least two mobile species are present in the active region. Each of the at least two mobile species is configured to define a separate state variable of the memristive device.
摘要:
A memristive device includes a first electrode, a second electrode crossing the first electrode at a non-zero angle, and an active region disposed between the first and second electrodes. The active region has a controlled defect profile throughout its thickness.
摘要:
A silicon-germanium, quantum-well, light-emitting diode. The light-emitting diode includes a p-doped portion, a quantum-well portion, and an p-doped portion. The quantum-well portion is disposed between the p-doped portion and the n-doped portion. The quantum-well portion includes a carrier confinement region that is configured to facilitate luminescence with emission of light produced by direct recombination with a hole confined within the carrier confinement region. The p-doped portion includes a first alloy of silicon-germanium, and the n-doped portion includes a second alloy of silicon-germanium.
摘要:
A laser communication system and method are disclosed. The laser communication system includes a laser receiver system to receive a frequency-shift keyed (FSK) optical signal encoded with a plurality of data signals. The laser receiver system including an FSK differential detection system that includes a plurality of differential detection filters that can each receive the FSK optical signal and generate an output. The FSK differential detection system can demodulate the FSK optical signal into a multi-bit digital code corresponding to a frequency of the FSK optical signal based on the output of each of the plurality of differential detection filters.
摘要:
An ionic device includes a layer (220) of an ionic conductor containing first and second species (222, 224) of impurities. The first species (222) of impurity in the layer (220) is mobile in the ionic conductor, and a concentration profile of the first species (222) determines a functional characteristic of the device (200). The second species (224) of impurity in the layer (220) interacts with the first species (222) within the layer (220) to create a structure (226) that limits mobility of the first species (222) in the layer (220).
摘要:
A signal-amplification device for surface enhanced Raman spectroscopy (SERS). The signal-amplification device includes a non-SERS-active (NSA) substrate, a plurality of multi-tiered non-SERS-active nanowire (MNSANW) structures and a plurality of metallic SERS-active nanoparticles. In addition, a MNSANW structure of the plurality of MNSANW structures includes a main arm of a plurality of main arms and a plurality of arms of at least secondary order. The plurality of main arms is disposed on the NSA substrate; and, a secondary arm of the plurality of arms is disposed on the main arm. Moreover, a metallic SERS-active nanoparticle of the plurality of metallic SERS-active nanoparticles is disposed on a surface of the MNSANW structure.
摘要:
An active chiral photonic metamaterial having a dynamically controllable photonic material parameter is employed in a system and a method of polarization rotation. The active chiral photonic metamaterial includes a first chiral photonic element formed in a first metal layer, a second chiral photonic element formed in a second metal layer, and an active material layer disposed between the first and second metal layers. The active material layer includes the photonic material parameter that is dynamically controllable. A coupling between the first chiral photonic element and the second chiral photonic element is a function of the photonic material parameter of the active material layer. The system further includes a means for controlling the dynamically controllable photonic material parameter. The method includes illuminating the active chiral photonic metamaterial with an optical signal and applying a control signal to vary the dynamically controllable photonic material parameter.
摘要:
A thermistor includes a multi-layer graphite structure having a basal plane resistivity that increases with increasing temperature; a substrate upon which the graphite structure is mounted; current and voltage electrodes attached to the graphite structure; current and voltage wiring; and a voltage measuring device to measure voltage out when current is applied to the thermistor.