Abstract: A reflection optical filter has an ultra-thin semi-transparent layer and a thin layer of semiconductor (or dielectric) layer deposited onto a metal film surface at a certain thickness corresponding to a wavelength of light to be filtered from incoming light. Critical coupling of light to the optical cavity formed by the semi-transparent layer and semiconductor (or dielectric) layer on metal surface results in near perfect absorption of the light at one wavelength and strong absorption in the wavelength region near the peak absorption wavelength. Incoming lights of other wavelengths are mostly reflected by the device so the spectral content of incident light is changed. By controlling the thickness of the semiconductor (or dielectric) layer and/or other factors, such as the extent to which the semiconductor layer is annealed or changing the type of metal beneath the semiconductor (or dielectric) layer, the peak absorption wavelength of the light absorbed in the device can be precisely controlled.

Abstract: An optical filter has a layer of silicon film deposited onto a metallic substrate surface at a silicon film thickness corresponding to a wavelength of light to be filtered from incoming light. The critical coupling of light to the optical cavity formed by the silicon film on metal surface results in a strong and near perfect absorption of the light at a resonance wavelength and strong absorption in the wavelength region near the peak absorption wavelength. Other wavelengths of the incoming wave are reflected by the device so the spectral content of light is changed. By controlling the thickness of the silicon film and/or other factors, such as the extent to which the silicon film is annealed or the type of metal beneath the silicon film, the wavelength of the light absorbed by the silicon film can be precisely controlled.

Abstract: The present disclosure pertains to metal or dielectric nanostructures of the subwavelength scale within the grating lines of optical diffraction gratings. The nanostructures have surface plasmon resonances or non-plasmon optical resonances. A linear photodetector array is used to capture the resonance spectra from one of the diffraction orders. The combined nanostructure super-grating and photodetector array eliminates the use of external optical spectrometers for measuring surface plasmon or optical resonance frequency shift caused by the presence of chemical and biological agents. The nanostructure super-gratings can be used for building integrated surface enhanced Raman scattering (SERS) spectrometers. The nanostructures within the diffraction grating lines enhance Raman scattering signal light while the diffraction grating pattern of the nanostructures diffracts Raman scattering light to different directions of propagation according to their wavelengths.

Abstract: The present disclosure pertains to metal or dielectric nanostructures of the subwavelength scale within the grating lines of optical diffraction gratings. The nanostructures have surface plasmon resonances or non-plasmon optical resonances. A linear photodetector array is used to capture the resonance spectra from one of the diffraction orders. The combined nanostructure super-grating and photodetector array eliminates the use of external optical spectrometers for measuring surface plasmon or optical resonance frequency shift caused by the presence of chemical and biological agents. The nanostructure super-gratings can be used for building integrated surface enhanced Raman scattering (SERS) spectrometers. The nanostructures within the diffraction grating lines enhance Raman scattering signal light while the diffraction grating pattern of the nanostructures diffracts Raman scattering light to different directions of propagation according to their wavelengths.

Abstract: The present disclosure pertains to metal or dielectric nanostructures of the subwavelength scale within the grating lines of optical diffraction gratings. The nanostructures have surface plasmon resonances or non-plasmon optical resonances. A linear photodetector array is used to capture the resonance spectra from one of the diffraction orders. The combined nanostructure super-grating and photodetector array eliminates the use of external optical spectrometers for measuring surface plasmon or optical resonance frequency shift caused by the presence of chemical and biological agents. The nanostructure super-gratings can be used for building integrated surface enhanced Raman scattering (SERS) spectrometers. The nanostructures within the diffraction grating lines enhance Raman scattering signal light while the diffraction grating pattern of the nanostructures diffracts Raman scattering light to different directions of propagation according to their wavelengths.

Abstract: The present disclosure pertains to metal or dielectric nanostructures of the subwavelength scale within the grating lines of optical diffraction gratings. The nanostructures have surface plasmon resonances or non-plasmon optical resonances. A linear photodetector array is used to capture the resonance spectra from one of the diffraction orders. The combined nanostructure super-grating and photodetector array eliminates the use of external optical spectrometers for measuring surface plasmon or optical resonance frequency shift caused by the presence of chemical and biological agents. The nanostructure super-gratings can be used for building integrated surface enhanced Raman scattering (SERS) spectrometers. The nanostructures within the diffraction grating lines enhance Raman scattering signal light while the diffraction grating pattern of the nanostructures diffracts Raman scattering light to different directions of propagation according to their wavelengths.

Abstract: The disclosure relates to surface plasmon-polariton waveguides, which can guide ultra-long range surface plasmon-polariton waves. The attenuation of an ultra-long range surface plasmon-polariton waves is much lower than the attenuation of the conventional long range surface plasmon-polariton waves guided with the same kind of metal film or metal strip at the same plasmon-polariton frequency. An exemplary ultra-long range surface plasmon-polariton waveguide disclosed in this disclosure comprises a metal layer, such as a metal film or finite width metal strip, intermediate dielectric layers adjacent to the metal layer, and outer cladding dielectric material. The intermediate dielectric layers redistribute the electromagnetic energy distribution of the surface plasmon-polariton waves so that less of the energy propagates in the metal layer. Therefore, the attenuation of the surface plasmon-polariton wave is reduced.

Abstract: The disclosure relates to surface plasmon-polariton waveguides, which can guide ultra-long range surface plasmon-polariton waves. The attenuation of an ultra-long range surface plasmon-polariton waves is much lower than the attenuation of the conventional long range surface plasmon-polariton waves guided with the same kind of metal film or metal strip at the same plasmon-polariton frequency. An exemplary ultra-long range surface plasmon-polariton waveguide disclosed in this disclosure comprises a metal layer, such as a metal film or finite width metal strip, intermediate dielectric layers adjacent to the metal layer, and outer cladding dielectric material. The intermediate dielectric layers redistribute the electromagnetic energy distribution of the surface plasmon-polariton waves so that less of the energy propagates in the metal layer. Therefore, the attenuation of the surface plasmon-polariton wave is reduced.

Abstract: An integrated optic gyroscope is disclosed which is based on a photonic integrated circuit (PIC) having a bidirectional laser source, a pair of optical waveguide phase modulators and a pair of waveguide photodetectors. The PIC can be connected to a passive ring resonator formed either as a coil of optical fiber or as a coiled optical waveguide. The lasing output from each end of the bidirectional laser source is phase modulated and directed around the passive ring resonator in two counterpropagating directions, with a portion of the lasing output then being detected to determine a rotation rate for the integrated optical gyroscope. The coiled optical waveguide can be formed on a silicon, glass or quartz substrate with a silicon nitride core and a silica cladding, while the PIC includes a plurality of III–V compound semiconductor layers including one or more quantum well layers which are disordered in the phase modulators and to form passive optical waveguides.

Abstract: A system and apparatus for packaging a laser diode is provided according to the present invention. It includes a solid structure having a first cavity, wherein the first cavity receives a fiber pipe with optical fiber, which is aligned to the laser diode. The solid structure also includes a recess that receives the fiber pipe; and a step for receiving a sealing ring. The solid structure is multi-layered and may be manufactured from ceramic material, beryllium oxide or aluminum nitride. The solid structure includes a second cavity that accommodates a fiber alignment mechanism; a sub-mount on which the laser diode is placed; and/or heat sink used for conducting heat from the laser diode.