37 results about "Photonic lattices" patented technology

The present invention discloses a widely wavelength tunable polychrome colloidal photonic crystal device whose optical Bragg diffraction stop bands and higher energy bands wavelength, width and intensity can be tuned in a continuous and fine, rapid and reversible, reproducible and predictable fashion and over a broad spectral range by a controlled expansion or contraction of the colloidal photonic lattice dimension, effected by a predetermined change in the electronic configuration of the composite material. In its preferred embodiment, the material is a composite in the form of a film or a patterned film or shape of any dimension or array of shapes of any dimension comprised of an organized array of microspheres in a matrix of a cross-linked metallopolymer network with a continuously variable redox state of charge and fluid content. The chemo-mechanical and electro-mechanical optical response of the colloidal photonic crystal-metallopolymer gel is exceptionally fast and reversible, attaining its fully swollen state from the dry shrunken state and vice versa on a sub-second time-scale. These composite materials can be inverted by removal of the constituent microspheres from the aforementioned colloidal photonic crystal metallopolymer-gel network to create a macroporous metallopolymer-gel network inverse colloidal photonic crystal film or patterned film or shape of any dimension optical Bragg diffraction stop bands and higher energy bands wavelength, width and intensity can be redox tuned in a continuous and fine, rapid and reversible, reproducible and predictable fashion and over a broad spectral range by a controlled expansion or contraction of the colloidal photonic lattice dimensions.

There is provided an illumination device (100) comprising an energy source (102) for exciting a photon emitter; a first wavelength conversion layer (104) and a second wavelength conversion layer (106). At least one of the first and second wavelength conversion layer comprises a periodic plasmonic antenna array comprising a plurality of individual antenna elements (108). The wavelength converting medium in the wavelength conversion layer in which the antenna array is arranged comprises photon emitters arranged in close proximity of the plasmonic antenna array such that at least a portion of photons emitted from the wavelength conversion layer are emitted by a coupled system comprising the photon emitter and the plasmonic antenna array. The plasmonic antenna array is configured to support plasmonic-photonic lattice resonances at a frequency range corresponding to the wavelength range of the photon emitter in the layer in which the plasmonic antenna array is arranged, such that light emitted from the plasmonic antenna array has an anisotropic angle distribution.

A photonic crystal fiber (PCF) preform, from which a photonic crystal fiber is manufactured, includes a rod-shaped substrate with holes longitudinally formed therethrough in a photonic lattice structure, and material layers having at least two different indices of refraction. The material layers are disposed in the holes, respectively. Distribution of index of refraction of the photonic crystal fiber preform is controlled by arrangement of the material layers. Consequently, an optical fiber with very low optical loss, very low optical nonlinearity and excellent transmission characteristics can be easily manufactured, and an optical fiber with various characteristics, differing depending upon the lattice structure, can be realized.

The invention provides a single-input multiple-output optical switch based on nonlinear photonic lattice, which includes a first waveguide layer, a second waveguide layer and a third waveguide layer. The first waveguide layer is arranged on the upper part of the second waveguide layer. The waveguide layer is arranged between the third waveguide layer and the first waveguide layer; the second waveguide layer includes a nonlinear waveguide, and both the first waveguide layer and the third waveguide layer include a linear waveguide; the nonlinear waveguide is a sinusoidal waveguide, linear The waveguides are all spiral waveguides; the optical switch also includes an input port and at least two output ports. The present invention can select different output ports according to actual needs, and the optical switches corresponding to each output port have different on-off thresholds, which increases flexibility in practical applications.

The embodiments of the invention provide a photonic crystal function structure for realizing directional invisibility of underwater sonic wave and a manufacturing method. The photonic crystal function structure includes an aluminum alloy matrix; the aluminum alloy matrix is drilled with holes which are arranged according to the period of a plane equilateral triangle photonic lattice. The middle part of the aluminum alloy matrix is penetrated with a cavity of the aluminum alloy matrix for accommodating the to-be-invisible object. According to the invention, the function structure can only be obtained by drilling the aluminum alloy matrix and is easy to process.