Abstract: According to an aspect, an optical system includes a laser diode configured to emit optical signals and at least two size-switchable broken racetrack ring resonators optically coupled to an optical waveguide, where each broken racetrack ring resonator is configured to exhibit a resonant wavelength. The optical system also includes a tuning arrangement associated with the broken racetrack ring resonators, where the tuning arrangement includes a micro electro-mechanical system (MEMS) or nano electro-mechanical system (NEMS) actuator mechanically coupled to a first portion of a first one of the broken racetrack ring resonators and configured to mechanically move the first portion so as to change the resonant wavelength of the first one of the broken racetrack ring resonators.

Abstract: A RF array coil system and method for magnetic resonance imaging are provided. The array coil system includes an anterior coil section having a main anterior coil section and at least one secondary anterior coil section removably attachable to the main anterior coil section. The array coil system further includes a posterior coil section having a main posterior coil section and at least one secondary posterior coil section removably attachable to the main posterior coil section.

Abstract: The present invention discloses a structure and method for realizing electromagnetically-induced transparency. In the present invention, a first split-ring resonator and a second split-ring resonator form a resonance structure. The first split-ring resonator and the second split-ring resonator are made of a conductive material. The first split-ring resonator has a “U” shape with a containing space. The second split-ring resonator has a “rectangular loop” shape with a gap or has a “U” shape with an opening. The second split-ring resonator is inserted into the containing space with the gap or opening arranged inside the containing space and faced downward to form the resonance structure. The resonance structures are periodically arranged on a chip to form an array. Thereby, different-frequency electromagnetic waves can be used to generate electromagnetically-induced transparency via regulating the dimensions of the resonance structure.

Abstract: Provided is a tunable magnetic field amplifying device capable of easily adjusting resonance frequencies and tuning usable bands by using discrete elements to vary electric properties of elements that are used for amplifying a magnetic field of a specific microwave band. The tunable magnetic field amplifying device includes a Swiss roll formed by winding a metal sheet coated with a dielectric in a spiral cylinder shape once or several times; and a tunable capacitor connected between an inner sheet of and an outer sheet of the metal sheet for tuning a resonance frequency.

Abstract: A method of treating a first chemical species in a gas using a plasma, the method including the steps of providing an array of micro-scale cavity discharge devices capable of sustaining the plasma where the first chemical species is capable of flowing proximate to the array of micro-scale cavity discharge devices, wherein the first chemical species is converted to a second chemical species within the plasma.

Abstract: This resonant line comprises a plurality of microstrip lines. The length of each of the microstrip lines is set so that the reactance between one end of each of the microstrip lines and the ground is equivalently inductive and one ends of the microstrip lines are connected to each other.

Abstract: A method for adjusting a voltage control type oscillator prevent changes in characteristics from occurring after adjustments and permits the oscillator to be produced at a low cost. The voltage control type oscillator includes a strip electrode provided on a first surface of a dielectric substrate and a ground electrode provided on a second surface of the dielectric substrate. The strip electrode and the ground electrode constitute a microstrip line resonator. In addition to the resonator, electric components are mounted on the first surface of the dielectric substrate. A case is attached to the dielectric substrate such that the case covers the strip electrode and the electronic components. After attaching the case, the strip electrode is trimmed by irradiating a laser beam from the second surface side of the dielectric substrate.

Abstract: A miniature, electrostatically actuated, variable impedance circuit element which is operably tunable in response to control signals. With integrated circuit, thin film processing a fixed circuit member is fabricated on a substrate and a movable circuit member is fabricated over the substrate and is movable relative to the fixed circuit member in response to electrostatic fields produced at armature tabs when the control signals are selectively applied to rows of control electrodes. Embodiments include a variable capacitor and a variable ring resonator.

Abstract: A multiply tuned bird cage results from the combination of low pass and high pass filter elements to yield a band reject network behaving as a low pass network at a low frequency and a high pass network at a high frequency. A band pass bird cage coil is obtained by adding a parallel LC combination to each leg of a bird cage coil to create additional poles in the impedance curve z(f).

Abstract: A so-called birdcage coil must be quickly deactivated after having generated an RF magnetic field, so as not to disturb the detection of the generated spin resonance signals by the surface coil (or another coil). To this end, semiconductor switches are included in some of the rod conductors of the birdcage coil. The switches are arranged substantially halfway along the rod conductors, because the RF voltage exhibits a zero crossing at that area. As a result, the semiconductor switches can operate with a low voltage. It has been found that the interruption of the rod conductors which are situated in one symmetry half of the birdcage coil and which carry most current in that half suffices for substantial deactivation.

Abstract: Tuning varactor circuitry is disclosed for a dielectric resonator stabilized oscillator (2). A varactor diode (22) is electrically connected in a loop (24) with an RF bypass capacitor (26), and the voltage across the diode is varied. In a first embodiment, first and second dielectric substrates (36, 38) face each other along the plane of the loop (24), with the loop (24) therebetween. In another embodiment, the loop (24) is around a peripheral side wall (52) of the dielectric resonator substrate (46). In another embodiment, the loop (24) is formed on the same surface (54) of a microstrip circuit substrate (56) with a transmission line (10).