Method and apparatus for generating high-power terahertz wave
A method and apparatus for generating terahertz waves using laser plasma are disclosed herein. The method of generating high-power terahertz waves includes generating plasma by focusing a laser beam on a gas within a vacuum chamber, radiating laser beams into the magnetized plasma from opposite directions so that the laser beams collide with each other at a preset location, and generating terahertz waves of a predetermined frequency through the oscillation of the plasma generated by the collision of the laser beams.
Publication number: US2016100476A1 | Search similar patents
Systems, methods, and apparatus for generating terahertz electromagnetic radiation
Certain embodiments of the invention may include systems, methods, and apparatus for generating terahertz electromagnetic radiation. According to an example embodiment of the invention, a method is provided for generating terahertz electromagnetic radiation. The method includes: coupling a terahertz resonator with an optical resonator, wherein the optical resonator comprises non-linear optical material; directing laser light through the optical resonator to generate terahertz radiation by parametric interaction of the laser light with the optical resonator and the terahertz resonator; and directing the terahertz radiation from the terahertz resonator to an output.
Publication number: US2012298889A1 | Search similar patents
Electromagnetic radiation emitter elements and method for generation of population inversions in said emitter elements
A new method for the generation of populations in exciton-p-states is proposed, and, thus, a method for the generation of population inversions of excitons, i.e. between their energetically spaced states in materials, in which excitons (bound electron-hole pairs) can be generated. Furthermore, emitter elements in the form of lasers or amplifiers (exciton THz lasers) or oscillators are proposed, which use the method according to the present invention in order to generate or strengthen electromagnetic radiation, or to use it in the form of a time unit (oscillator), according to the energetic distances of the exciton states.
Publication number: WO2006010363A2 | Search similar patents
A terahertz spectroscopy system comprises a tenahertz source for illuminating, in use, a sample with a pulse of radiation in the terahertz frequency range. Excitation means provides excitation energy in the form of an electromagnetic or acoustic wave during illumination of the sample by the terahertz source and a terahertz sensor receives energy from the illuminated sample. Processing means receives signals from the terahertz sensor and processes them to provide an output representative of the terahertz spectrum received by the sensor.
Publication number: EP1535051A1 | Search similar patents
Generation of terahertz electromagnetic waves in graphene by coherent photon-mixing
An electromagnetic device and method for fabrication includes a substrate and a layer of graphene formed on the substrate. A metallization layer is patterned on the graphene. The metallization layer forms electrodes such that when the graphene is excited by light, terahertz frequency radiation is generated.
Publication number: US2013015375A1 | Search similar patents
Methods and systems for detecting terahertz radiation by radiation enhanced emission of fluorescence
Methods and systems for detecting radiation, particularly, terahertz (THz) radiation, are disclosed. The methods and systems disclosed include directing an optical beam in a volume of gas; ionizing at least a portion of the volume of gas with the optical beam to produce a plasma; and detecting a fluorescence produced from an interaction of a radiation wave with the plasma. The information contained in the characteristics of the detected fluorescence, for example, the amplitude and/or phase are used to characterize the radiation wave. Aspects of the invention may be used for homeland security, medicine, and astronomy, among other fields.
Publication number: US2011272584A1 | Search similar patents
Terahertz frequency radiation sources and detectors based on group iv materials and method of manufacture
An electrically-pumped terahertz (THz) frequency radiation source (or detector), including an optical gain (or absorption) material with two electrodes electrically coupled to the optical gain material. The optical gain (or absorption) material is formed substantially of at least one group IV element and doped with at least one dopant, which has an intra-center transition frequency in a range of about 0.3 THz to 30 THz. Also, a method of manufacturing electrically-pumped THz frequency radiation sources (or detectors).
Publication number: US2004228371A1 | Search similar patents
Semiconductor surface-field emitter for t-ray generation
An apparatus and a method for the generation of high-energy terahertz radiation. The apparatus and method function by impinging optical radiation on the surface of a semiconductor substrate, creating a photo-generated dipole emitting terahertz radiation. Because it is desirable to orient the dipole perpendicular to the radiation direction to maximize the power of the terahertz radiation, the surface of the semiconductor is modified to achieve this desirable result. More specifically, three embodiments of the surface modification are disclosed: (1) a grating is created in the top surface of a GaAs semiconductor substrate, (2) an InAs film is formed on a Teflon base to create a grating structure on the semiconductor substrate, and (3) a grating is disposed in the surface of the semiconductor substrate such that the optical radiation engages the substrate at Brewsters angle.
Publication number: US2004262544A1 | Search similar patents
Terahertz radiation sources and methods
The invention relates to improved terahertz radiation sources and associated methods. A terahertz radiation source is described, comprising: an emitter (202) comprising a semiconductor material (12); a pair of electrodes (204a,b) adjacent a face of said semiconductor, said pair of electrodes defining a gap between said electrodes; a pulsed light source input for illuminating said semiconductor to excite photo-carriers in said semiconductor to generate terahertz radiation; and a radiation collector (212) to collect said terahertz radiation; and wherein said radiation collector is disposed on the same side of said semiconductor as said electrodes. A related method of providing terahertz radiation is also described.
Publication number: EP1606856A2 | Search similar patents
Fabricating information inside physical objects for imaging in the terahertz region
The infrastruct fabrication and imaging technique described herein uses digital fabrication techniques to embed information inside objects and THz imaging to later decode this information. Information is encoded in a digital model to create structured transitions between materials. Digital fabrication is used to precisely manufacture the digital model with material transitions enclosed internally. A THz Time-Domain Spectroscopy (TDS) system is used to create a volumetric image of the object interior. The volumetric image is processed to decode the embedded structures into meaningful information.
Publication number: US2015170013A1 | Search similar patents
Device for generating thz radiation
A device for generating terahertz radiation. The device comprising a dipole generating layer, a coupling block and an extraction block. The coupling block is transparent to laser light and is in contact with the surface of the dipole generating layer to couple light from a laser to the surface of the dipole generating layer, when the device is in use. The extraction block is located in contact with the surface of the dipole generating layer to provide an emission extraction surface. The refractive indices of the dipole forming layer, the coupling block and the extraction block are substantially equal. In this way, the dipole which is generated upon illumination of the dipole generating layer by a laser, has an axis which is not perpendicular to the emission
Publication number: EP1415195A1 | Search similar patents
Method and system for generating and emitting terahertz radiation
A method of generating light is disclosed. The method comprises: directing an optical pulse to a semiconductor optical amplifier being at a temperature above 0° C. The optical pulse is preferably characterized by a wavelength within an emission spectrum of the semiconductor optical amplifier and by a pulse area selected to induce Rabi oscillations in the semiconductor optical amplifier, and to emit light at a frequency of at least 1 THz.
Publication number: US2015043056A1 | Search similar patents
Plasma diagnostic method using terahertz-wave-enhanced fluorescence
Methods and systems for characterizing a plasma with radiation, particularly, terahertz (THz) radiation, are disclosed. The disclosed method of characterizing a plasma includes directing THz radiation into the plasma; and detecting an emission due to interaction of the THz radiation with the plasma to characterize the plasma. A disclosed plasma characterizing device includes a means for directing THz radiation into a plasma; and a detector adapted to detect an emission emitted by the plasma due to interaction of the THz radiation with the plasma to characterize the plasma. A plasma characterizing system is also disclosed. The emission detected may be a fluorescence, a variation in fluorescence and/or an acoustic emission.
Publication number: US2012193535A1 | Search similar patents
Method and apparatus for thz radiation power enhancement
A method and apparatus for enhancing the energy of THz radiation in the form of photon pulses comprising synchronously reflecting photon pulses using at least one pair of facing optical mirrors such that the reflected photon pulses encounter an electron bunch or another photon pulse travelling in the same direction and energy is transmitted from the electron bunch or the other photon pulse resulting in an increase in the energy of the reflected photon pulse.
Publication number: US6714346B1 | Search similar patents
Method for detecting polynucleotide sequences
The invention relates to a method for proving the existence of a polynucleotide sequence A in a sample containing a plurality of identical or different polynucleotide sequences X as individual strands and where the polynucleotide sequence A may be identical with one of the polynucleotide sequences X or may be contained as a sequence portion in one of the polynucleotide sequences X, through the inquiry of the state of linkage of the polynucleotide sequences X contained in the sample to a known test polynucleotide sequence B complementary to the polynucleotide sequence A, comprising the following steps: preparation of a test medium containing as individual strands test polynucleotide sequences B complementary to the polynucleotide sequence A which is to be proven, establishing contact of the sample with the test medium by placing the sample into or onto the test medium such that the individual strands of the polynucleotide sequences X contained in the sample may bind to the complementary test polynucleotide sequences B contained in the test medium. For proving a linkage of polynucleotide sequences X to test polynucleotide sequences B, the following step c) is carried out: determination of at least one component of the complex index of refraction or of a parameter equivalent to it of the sample which is in contact with the test medium by interaction with incident electro-magnetic radiation, the frequency of which is within the range of 0.1 terahertz (THz) and 20 THz, preferably between 1 THz and 10 THz and subsequent analysis of the properties of the electro-magnetic radiation after the interaction, in particular in respect of time delay or phase delay, absorption, refraction or dispersion of the incident electro-magnetic radiation caused by the interaction.
Publication number: WO0204928A1 | Search similar patents