57 results about "Energy transition" patented technology

Multi-wavelength optical apparatus includes an optical emitter, and an energy transition layer positioned adjacent to the optical emitter. The energy transition layer generates multi-wavelength electromagnetic radiation when monochromatic light from the optical emitter passes therethrough. The energy transition layer includes a plurality of luminescent films, and each film is configured to luminesce at a respective different wavelength range when monochromatic light from the optical emitter passes therethrough. The plurality of luminescent films may be arranged in contacting face-to-face relationship or may be arranged in an array. The luminescent films may include rare-earth doped oxides, phosphors, metal-doped oxides, rare-earth doped nitrides, nanostructures, and / or nanostructured films, etc. The optical emitter may be a light emitting diode (LED), a laser diode (LD), an organic light-emitting diode (OLED), a resonant cavity light emitting diode (RCLED), and / or an edge-emitting diode (EELED).

The invention relates to a continuous production technology of a polytetrafluoroethylene membrane with an electromechanical energy transition function. The technology comprises two parts consisting of a heat bonding step of a microporous composite membrane and a charging step of the composite membrane, wherein the heat bonding step of the microporous composite membrane is characterized in that: there are at least two compact polytetrafluoroethylene membranes, the composite membrane is prepared through arranging a layer of the porous polytetrafluoroethylene membrane between each adjacent polytetrafluoroethylene membranes to form an alternatively laminated layer, the alternatively laminated layer is introduced into a space between an upper hot press roll and a lower hot press roll, and a polytetrafluoroethylene piezoelectret membrane is obtained through charging the composite membrane; and the charging step of the composite membrane is that: the composite membrane enters a space between an electrode roll and a corona electrode and corona polarization is carried out, or is that: the composite membrane enters an electroplating zone, electrodes are adhered on the upper surface and the lower surface of the composite membrane, and then the composite membrane enters a contact method charging zone. The continuous production technology of the invention has the advantages of continuity and high production efficiency, and products of the polytetrafluoroethylene membrane with the electromechanical energy transition function have excellent piezoelectric performances and high temperature performances.

A medical imaging method comprising generating a radiation at a first energy level by a radiation source, generating a radiation at a second energy level different from the first energy level by the radiation source, emitting the generated radiations at an output of the radiation source towards a detector, and blocking or diverting the emitted radiations during at least one intermediate phase during which the radiation source switches in a transient way from one of the first energy level and the second energy level to the other of the first energy level and the second energy level.

Methods and corresponding apparatus for optical amplification in semiconductors, particularly indirect band-gap semiconductors, and most particularly in silicon. A first aspect of the invention employs certain doping elements to provide inter-band-gap energy levels in combination with optical or current-injection pumping—The doping element, preferably a noble metal and most preferably Gold, is chosen to provide an energy level which enables an energy transition corresponding to a photon of wavelength equal to the signal wavelength to be amplified. The energy transition may be finely “adjusted” by use of standard doping techniques (such as n-type or p-type doping) to alter the conduction and valence band energy levels and thereby also the magnitude of the energy transition. A second aspect of the invention relates to the use of a non-homogeneous heat distribution which has been found to lead to optical amplification effects.

The field of the invention is that of semiconductor devices used for the amplification or for the phase modulation of optical signals. These devices are known by the generic names SOA (semiconductor optical amplifier) and DPSK (differential phase shift keying) modulators. The main drawbacks of this type of device are that it is, on the one hand, difficult to obtain a constant gain, and, on the other hand, it is difficult for the optical signal to be independently amplitude-modulated and phase-modulated. The device according to the invention does not have these drawbacks. It relies essentially on three principles: the active zone of the device has a quantum dot structure, the atoms of said structure possessing a first energy transition state called the ground state and a second energy transition state called the excited state; the active zone is placed in a structured resonant cavity in order to resonate at a first wavelength corresponding to the ground state; and the current flowing through the active zone is greater than the saturation current of the ground state so as to allow oscillation at a second wavelength corresponding to the excited state.