A terahertz wave pulse wave amplitude modulation signal and an optical pulse amplitude modulation signal conversion amplifier includes a rectangular cavity, an absorption cavity, a metal block, a first waveguide, a second waveguide, three metal films, a terahertz pulse wave and a reference light; the rectangular cavity is located at the terahertz pulse wave input port, an incident port of the terahertz pulse wave is located at an upper port of the absorption cavity, and the absorption cavity is connected with a first waveguide; the metal block is disposed within the first waveguide, and is movable; the first waveguide is connected with a second waveguide; and an output power of the reference light is in correspondence with a power of an input terahertz pulse wave.

A terahertz wave pulse wave amplitude modulation signal and an optical pulse amplitude modulation signal conversion amplifier includes a rectangular cavity, an absorption cavity, a metal block, a first waveguide, a second waveguide, three metal films, a terahertz pulse wave and a reference light; the rectangular cavity is located at the terahertz pulse wave input port, an incident port of the terahertz pulse wave is located at an upper port of the absorption cavity, and the absorption cavity is connected with a first waveguide; the metal block is disposed within the first waveguide, and is movable; the first waveguide is connected with a second waveguide; and an output power of the reference light is in correspondence with a power of an input terahertz pulse wave.

Systems and methods are provided for enhancing the terahertz power output of a terahertz beam while increasing its stability and its beam polarity by implementing a pair of pinched ripple electrodes and a small flat section in the middle of each electrode. By using tight control over the design parameters and by exploiting the plasmonic effect and the superradiance effect, systems and methods according to embodiments of the present disclosure can achieve a dramatic improvement in the terahertz output power and beam quality as well as the beam stability.

Provided is a linearly polarized ultra-short terahertz wave generating device which has a parabolic barrel mirror installed at one side of a multiple thin film, to generate an ultra-short terahertz wave having single linear-polarized light and uniformly formed output distribution.

A mixer-based microwave signal generation device is provided, and the mixer-based microwave signal generation device includes a microwave local oscillator source, a mixer, a first filter, a laser, an electro-optic modulator, an optical signal delayer, a photodetector, a second filter, an amplifier and a passive power divider.

A mixer-based microwave signal generation device is provided, and the mixer-based microwave signal generation device includes a microwave local oscillator source, a mixer, a first filter, a laser, an electro-optic modulator, an optical signal delayer, a photodetector, a second filter, an amplifier and a passive power divider.

Provided is a linearly polarized ultra-short terahertz wave generating device which has a parabolic barrel mirror installed at one side of a multiple thin film, to generate an ultra-short terahertz wave having single linear-polarized light and uniformly formed output distribution.

A technique relates to a superconducting microwave device. A left-handed resonator include at least one unit cell. A non-linear dispersive medium is connected to the left-handed resonator, such that one end of the left-handed resonator is connected to the non-linear dispersive medium and an opposite end of the left-handed resonator is connected to a port. The left-handed resonator and the non-linear dispersive medium are configured to output a quantum signal in a squeezed state.

A technique relates to a superconducting microwave device. A left-handed resonator include at least one unit cell. A non-linear dispersive medium is connected to the left-handed resonator, such that one end of the left-handed resonator is connected to the non-linear dispersive medium and an opposite end of the left-handed resonator is connected to a port. The left-handed resonator and the non-linear dispersive medium are configured to output a quantum signal in a squeezed state.

The present invention relates to a device (1) for characterizing an interface of a structure (6), said structure (6) comprising a solid first material and a second material, the materials being separated by said interface. The device (1) comprises: means (2) for generating a first mechanical wave; means (2) for forming Brillouin oscillations; means (10) for detecting time variation of the Brillouin oscillations; means (12) for responding to the time variation of the Brillouin oscillations to identify reflection of said first mechanical wave by said interface or transmission through said interface of a second mechanical wave interfering with the first mechanical wave; and means (13) for determining the variation in amplitude of the Brillouin oscillations before and after reflection or transmission by said interface. The invention also relates to a corresponding method of characterization.