95results about How to "Good tunability" patented technology

An organic white light-emitting device, including a substrate; an anode and a cathode spaced from each other; a light-emitting layer including a yellow dopant for emitting yellow light; and first and second blue light-emitting layers, each blue light-emitting layer having at least one different material than the other blue light-emitting layer.

An active agent delivery system that includes two or more active agents and two or more layers of polymers; wherein at least one layer includes miscible polymer blend comprising two or more miscible polymers; and further wherein delivery of at least one active agent occurs predominantly under permeation control.

An organic material having a 6-member ring structure represented by the following formulae (I),

wherein:

• • ring A, ring B, and ring C each include substituted or un-substituted aromatic rings comprising 6 to 60 carbon atoms, or substituted or un-substituted heteroaromatic rings comprising 4 to 60 carbon atoms, and ring A and ring C form a fused aromatic or heteroaromatic structure; X is a carbon atom, a nitrogen atom, a sulfur atom, a silicon atom, an oxygen atom, a phosphorus atom, a selenium atom, or a germanium atom.

A tandem OLED device having two spaced electrodes comprising: first and second light-emitting units that produce different emission spectra disposed between the electrodes, the first light-emitting unit produces light that has multiple peaks at wavelengths longer than 500 nm and substantially no emission at wavelengths shorter than 480 nm, and the second light-emitting unit produces light that has substantial emission at wavelengths shorter than 500 nm; and an intermediate connector disposed between the light-emitting units.

An organic compound comprising a complex fluorene structure represented by one of the following formulas:

wherein:

Parallel plate tunable varactors having a bulk capacitance contribution to a total capacitance increased compared to a fringing capacitance contribution are disclosed. The contribution of the bulk capacitance to the total capacitance of an exemplary BST varactor is increased by increasing the area/perimeter ratio of the active region, thereby improving the tunability and other properties of the varactor. In an exemplary embodiment, an active region of the varactor has a lateral shape with a perimeter that is less than a perimeter of an equivalent area square. In various exemplary embodiments, the shape of the active region may be substantially circular or substantially octagonal. Methods for fabricating and designing such varactors are also disclosed.

A method for forming a protective bilayer on a magnetic read/write head or magnetic disk. The bilayer is formed as an adhesion enhancing underlayer and a protective diamond-like carbon (DLC) overlayer. The underlayer is formed of an aluminum or alloyed aluminum oxynitride, having the general formula AlO_xN_y or Me_zAlO_xN_y where Me_z symbolizes Ti_z, Si_z or Cr_z and where x, y and z can be varied within the formation process. By adjusting the values of x and y the adhesion underlayer contributes to such qualities of the protective bilayer as stress compensation, chemical and mechanical stability and low electrical conductivity. Various methods of forming the underlayer are provided, including reactive ion sputtering, plasma assisted chemical vapor deposition, pulsed laser deposition and plasma immersion ion implantation.

The invention relates to a triple-frequency-band antenna used in WLAN and WiMAX and belongs to the technical field of wireless communication. The triple-frequency-band antenna comprises a bottom first microstrip branch structure (1), a left second microstrip branch structure (2, 3), an intermediate microstrip branch structure (4), a right fourth microstrip branch structure (5-7), a microstrip feed line (8), a comb-shaped parasitic unit (9-12), a common-ground structure (13-18), and a dielectric slab (19). The triple-frequency-band antenna is characterized in that (a), a basic radiation unit is formed by the four microstrip branch structures mentioned above and is directly connected with the microstrip feed line (8); (b), a gap is arranged between the microstrip feed line (8) and the common-ground structure such that coplanar waveguide feed is formed; and (c), the dielectric slab uses FR4 dielectric material. The triple-frequency-band antenna has advantages of compact structure, easy integration, simple processing, multiple frequency bands, good tenability, and a stable directional diagram, and may simultaneously satisfy requirements of WLAN and WiMAX systems.

The invention provides cross-linked lyotropic liquid crystal (LLC) copolymers having ordered nanometer-sized pores lined with functional groups. The copolymers are formed by copolymerizing LLC monomers with strong LLC character and functionalized monomers with no or weak LLC character to form an LLC phase. Both the LLC monomers and the functionalized monomers contain hydrogen-bonding groups and hydrogen-bonding is believed to assist in the formation of the LLC phase of the blended mixture. Different classes of functional groups useful for the invention include, but are not limited to, acidic groups, basic groups, catalytic groups, oxidizing agents, reducing agents, polymerization initiators, binding agents, optically active groups, and electrically active groups. The invention also provides methods for making the cross-linked LLC copolymers of the invention. In these methods, the LLC monomer and the functionalized monomer are blended in a polar solvent, thereby allowing self-assembly of the first and second monomer into an LLC phase. The LLC phase in then cross-linked with retention of the LLC microstructure.

The invention discloses a dynamic tunable filter based on a polarization controller and a waveguide grating and a tuning method. The filter structure comprises the polarization controller and the waveguide grating, wherein the polarization controller is a linearly polarized device. An X-cut lithium niobate crystal serves as a substrate of the waveguide grating, a groove-type waveguide structure is manufactured on the substrate, a wrinkly rank bragg grating is etched at one end of a waveguide, and electrodes are arranged on two sides of the groove-type waveguide and two sides of the wrinkly rank bragg grating in an electroplate mode respectively. The reflex resonant wavelength can be fast tuned by adjusting voltage exerted on the two sides of the wrinkly rank bragg grating, a reflected wave phase is tuned at a high speed by adjusting voltage exerted on two sides of the groove-type waveguide, and at last, the reflected wave light strength is dynamically controlled by controlling the angles of the linearly polarized device. The dynamic tunable filter has the advantages of being high in integration level and tunable sensitivity, good in stability, suitable for being applied to all optical network communication with ultrahigh speed and large capacity, and the like.

The present invention discloses a gain-boosted N-path SC bandpass filter (GB-BPF) with a number of sought features. It is based on a transconductance amplifier (G_m) with an N-path SC branch as its feedback network, offering 1) double RF filtering at the input and output of the G_m in one step; 2) customized passband gain and bandwidth with input-impedance match, and 3) reduced physical capacitance thanks to the loop gain offered by G_m. All have been examined using a RLC model of the SC branch before applying the linear periodically time-variant (LPTV) analysis to derive the R, L and C expressions and analytically study the harmonic selectivity, harmonic folding and noise. The latter reveals that: 1) the noise due to the switches is notched at the output, allowing smaller switches to save the LO power; and 2) the noises due to the source resistance and G_m are narrowband at the output, reducing the folded noise during harmonic mixing.

The invention provides an annular optical fiber with an asymmetrical optical grating and application in orbital angular momentum generation thereof. A hollow core annular optical fiber can increase the effective refractive index between degeneracy-similar modes, thereby preventing crosstalk between the modes. A long period optical grating inscribed on the upper half ring of the hollow core annular optical fiber breaks a circular symmetry structure of the optical fiber and achieves conversion between angular non-same order modes. When input light is of a circular polarization fundamental mode, a first-order orbital angular momentum mode can be generated. The hollow core of the hollow core annular optical fiber is filled with an optical functional material with the refractive index adjustable and the wave length for generating the orbital angular momentum mode can be tuned by the refractive index of the liquid, so that the structure can generate the orbital angular momentum mode in an adjustable cross band wave length range. Simulation shows that when the optical grating period is 292 [mu]m and the optical grating length is 1.460cm, the range of broad band wave lengths with the angular momentum mode conversion rate higher than 90% can reach 237nm, the greatest conversion rate is 98.91%, and the modulation rate of the refractive index of the filling liquid for the wave lengths for orbital angular momentum mode generation is 400nm/RIU.

Varactor shunt switches based on a nonlinear dielectric tunability of Ba_xSr_(1−x)TiO₃ (BST) thin-film on a sapphire substrates are presented. Nanostructured BST thin-films with dielectric tunability as high as 4.3:1 can be obtained on sapphire substrates, with very low loss-tangents below 0.025 at zero-bias and 20 GHz. The large capacitance of the varactor at zero bias can shunt the input signal to ground isolating the output port, resulting in the OFF state. When applying a bias voltage of approximately 10 V (a dc electric field of ˜250 kV/cm), the varactor's capacitance can be reduced to a minimum, allowing maximum transmission to the output resulting in the ON state. The microwave switching performance of the varactor shunt switch can be compared with the RF MEMS switches for potential applications at microwave and millimeterwave frequencies. Other applications of such BST varactors include tunable filters, phase shifter circuits and impedance matching circuits

The invention discloses a monolithic integrated solar-blind ultraviolet and near-infrared double-color photoelectric detector which sequentially comprises an AlN template, an AlGaN/AlN superlattice layer, an AlGaN transition layer, an n-type AlGaN layer, a conductive oxide nano antenna and metal interdigital electrodes from bottom to top, the metal interdigital electrodes comprise a first interdigital electrode and a second interdigital electrode which are arranged in a crossed manner; and the conductive oxide nano antenna is arranged in the first interdigital electrode. On the basis of not influencing solar blind ultraviolet light detection, the near-infrared photoelectric conversion efficiency is high, the sensitivity is high, the device structure is simple, and the detection wavelengthtunability is good. The invention also provides a manufacturing method of the monolithic integrated solar blind ultraviolet and near infrared double-color photoelectric detector with the above advantages.

The present invention discloses a silicon dioxide mononuclear bismuth-silver double-cap composite nano-particle and the making method thereof, the silicon dioxide mononuclear bismuth-silver double-cap composite nano-particle is provided with a layer of bismuth thin film on the silicon dioxide nano-particle and one layer of silver thin film is provided on the bismuth thin film; the preparing method comprises the steps of: (1) preparing silicon dioxide nano-particle with St ber method; (2) preparing silicon dioxide nano-particle single layer array on the surface of the piezoid with the self-assembling technique; (3) successively depositing the bismuth thin film and silver thin film on the surface of the piezoid which is covered with silicon dioxide nano-particle with heat evaporation method. The obtained composite nano-particle has excellent chemical stability and the absorption spectrum chart after depositing for one year is nearly unchanged. The preparing method has the advantages of easy operating, low cost, good repeatability, easy controlling of the nuclear diameter and cap thickness.

The invention provides a waveguide chip for realizing nonlinear frequency conversion based on a coupling waveguide. The waveguide chip comprises: sequentially arranged pumping laser manipulation regions I, a waveguide coupling region II for generating parametric light and entangled photons, and a region III for manipulating converted light; a coupling waveguide region is arranged in a waveguide optical path region II, and the length of the coupling region should be large enough to ensure that an optical field can be coupled back and forth for multiple times; the total length of the waveguide chip is at a centimeter order; a host material of the coupling waveguide comprises various second order and third order nonlinear optical materials capable of fabricating the waveguide; a nonlinear processes occurring in the coupling region comprises all classical and quantal three-wave and four-wave action processes; the occurring nonlinear processes contain all second-order and third-order nonlinear processes, comprising frequency doubling, difference frequency, sum frequency, parametric amplification and other processes; the generated converted light contains a classical parametric light field and a quantal entangled photon source; and the waveguide chip is manipulated by using integrated thermo-optic and electro-optical effects.