摘要:
A system for multiplexing a plurality of high speed light emitting diodes (HSLEDs) includes a plurality of HSLEDs. Each of the plurality of HSLEDs emits a wavelength of light at a speed greater than or equal to about 1 Gigabyte per second. A multiplexer receives the wavelengths of light from the plurality of HSLEDs and combines the wavelengths of light for transmission over a channel. A method of multiplexing the plurality of HSLEDs is also disclosed.
摘要:
Various embodiments of the present invention are related to microresonator systems and to methods of fabricating the microresonator systems. In one embodiment, a microresonator system comprises a substrate having a top surface layer and at least one waveguide embedded in the substrate and positioned adjacent to the top surface layer of the substrate. The microresonator system also includes a microresonator having a top layer, an intermediate layer, a bottom layer, a peripheral region, and a peripheral coating. The bottom layer of the microresonator is attached to and in electrical communication with the top surface layer of the substrate. The microresonator is positioned so that at least a portion of the peripheral region is located above the at least one waveguide. The peripheral coating covers at least a portion of the peripheral surface and has a relatively lower index of refraction than the top, intermediate, and bottom layers of the microresonator.
摘要:
Devices and methods for modifying an electromagnetic beam include a tunable refractive medium, an input waveguide configured for directing an incident radiation to the tunable refractive medium, and at least one output waveguide configured for directing a focused radiation emanating from the tunable refractive medium. The tunable refractive medium comprises first electrodes coupled to a first surface of a periodic dielectric medium, and second electrodes coupled to a second surface of the periodic dielectric medium. The periodic dielectric medium includes a dielectric periodicity configured for providing a negative refraction of the incident radiation and focusing the focused radiation at a focal location. The focal location may be modified by at least one electromagnetic signal applied between the first electrodes and the second electrodes.
摘要:
An apparatus and related methods for facilitating surface-enhanced Raman spectroscopy (SERS) is described. A SERS-active structure near which a plurality of analyte molecules is disposed is periodically deformed at an actuation frequency. A synchronous measuring device synchronized with the actuation frequency receives Raman radiation scattered from the analyte molecules and generates therefrom at least one Raman signal measurement.
摘要:
A structure includes a film having a plurality of nanoapertures and a semiconductor layer in connection with the film. The nanoapertures are configured to allow the transmission of a predetermined subwavelength of light through the film via the plurality of nanoapertures. The semiconductor layer facilitates the modulation of the predetermined subwavelength of light transmitted through the film. The structure also includes a carrier generator for modulating the predetermined subwavelength of light by generating charge carriers
摘要:
A composite material exhibiting at least one of a negative effective permittivity and a negative effective permeability for incident radiation at an operating wavelength is described. The composite material comprises a dielectric layer generally parallel to a dielectric layer plane, and further comprises a first plurality of nanowire pairs disposed in the dielectric layer. Each of the first plurality of nanowire pairs comprises substantially parallel conductive nanowires of short length and separation relative to the operating wavelength. Each of the first plurality of nanowire pairs is substantially coplanar with a first plane substantially parallel to the dielectric layer plane.
摘要:
A technique for reducing speckle in a projected image includes forming an image using a plurality of laser light emitters. An input to the plurality of laser light emitters is non-mechanically perturbed to a degree sufficient to disrupt wavefront uniformity across the array of laser light emitters.
摘要:
Raman spectroscopy systems include an analyte, a radiation source configured to emit incident radiation having a wavelength, and a detector that is capable of detecting only radiation having wavelengths within a detectable range that includes at least one wavelength corresponding to hyper Raman scattered radiation scattered by the analyte. The wavelength of the incident radiation is outside the detectable range. In particular systems, all wavelengths of radiation that are scattered in the direction of the detector impinge on the detector. Raman spectroscopy methods include providing an analyte and irradiating the analyte with incident radiation having a wavelength, providing a detector capable of detecting only wavelengths of radiation within a detectable range that does not include the wavelength of the incident radiation, and detecting Raman scattered radiation scattered by the analyte. A continuous path free of radiation filters may be provided between the analyte and the detector.
摘要:
A composite material for providing at least one of a negative effective permeability and a negative effective permittivity for incident radiation of at least one wavelength is described. The composite material comprises a plurality of three-dimensional resonant cells disposed across a first substrate. Each three-dimensional resonant cell comprises a base substantially parallel to the substrate and at least three sidewalls upwardly extending therefrom. Each upwardly extending sidewall comprising a sidewall substrate having at least one conductor patterned thereon. Each upwardly extending sidewall is fabricated by forming the sidewall substrate as a substantially horizontal layer above the first substrate, lithographically patterning the sidewall substrate with the at least one conductor while horizontally disposed above the first substrate, and tilting up the sidewall substrate to the upwardly extending position.
摘要:
Raman systems include a radiation source, a radiation detector, and a Raman device or signal-enhancing structure. Raman devices include a tunable resonant cavity and a Raman signal-enhancing structure coupled to the cavity. The cavity includes a first reflective member, a second reflective member, and an electro-optic material disposed between the reflective members. The electro-optic material exhibits a refractive index that varies in response to an applied electrical field. Raman signal-enhancing structures include a substantially planar layer of Raman signal-enhancing material having a major surface, a support structure extending from the major surface, and a substantially planar member comprising a Raman signal-enhancing material disposed on an end of the support structure opposite the layer of Raman signal-enhancing material. The support structure separates at least a portion of the planar member from the layer of Raman signal-enhancing material by a selected distance of less than about fifty nanometers.