摘要:
This invention relates to a photoconductive antenna element having a structure capable of preventing element characteristics from deteriorating and attain a smaller size at the same time. This photoconductive antenna element (17) comprises a pair of electrodes (21) formed on a semiconductor layer (19). Each electrode (21) is constituted by an antenna part (22), pad parts (23), and a line part (24) connecting them, while the line part (24) includes a parallel portion (24a) extending from the antenna part (22). In the line part (24) of one electrode (21), a portion other than the antenna region (A) is bent opposite to the other electrode (21). In the line part (24) of the other electrode (21), a portion other than the antenna region (A) is bent opposite to the one electrode (21). This structure can prevent the photoconductive antenna element (17) from deteriorating its element characteristics and make it smaller.
摘要:
A method of tunable generation of terahertz radiation comprising: (A) providing a magnon gain medium; wherein the magnon gain medium supports generation of nonequilibrium magnons; (B) generating terahertz radiation in the magnon gain medium; and (C) tuning frequency of the terahertz radiation by causing changes in an external parameter. The substantial tuning of the frequency of the generated terahertz radiation can be achieved by applying an external magnetic field, and by causing changes in a value of the external magnetic field.
摘要:
The invention relates to a terahertz optoelectronic device (1) that can cooperate with an electronic appliance (2) in order to generate or detecting terahertz electromagnetic waves (3), and a method for generating or detecting terahertz electromagnetic waves. The electronic appliance (2) comprises at least two remote metallic conductors (4a, 4b), and means (6, 6') for generating an electrical field or measuring an electrical current between the metallic conductors (4a, 4b). The terahertz optoelectronic device (1) comprises a light excitation source that can deliver light signals, and an optical fibre (8) comprising a first and a second end (9a, 9b). According to the invention, the terahertz optoelectronic device (1) comprises a semiconductor component (10) fixed to the second end of the optical fibre (8). The light excitation source (7) can excite the semiconductor component (10) in order to generate charge carriers therein, enabling terahertz electromagnetic waves (3) to be generated or measured when the semiconductor component is close to, or in contact with, the metallic conductors (4a, 4b), the terahertz optoelectronic device (1) being mobile in relation to the electronic appliance (2).
摘要:
An electromagnetic radiation emitter (12) which utilizes a precompensator (14), pulsed light signal, optical fiber cable (18), and a terahertz radiation generator (16). The present invention incorporates an optical precompensator (14) to correct for the stretching of an optical signal as it travels through an optical fiber cable (18). The dispersion characteristics of the precompensator (14) will be equal and opposite to the dispersion characteristics of the optical fiber cable, maintaining the fidelity of optical pulses as they travel through and exit the optical fiber cable (18) striking a device that generates terahertz electromagnetic radiation (16).
摘要:
A method of examining a configuration of an sample (8) includes the step of irradiating a terahertz pulsed light (S), which possesses a wavelength to transmit through the sample (8), to at least two different portions of the sample (8), the step of detecting at least two electric field amplitude-time resolved waveforms of the terahertz pulsed light (S) transmitted through the first and second portions of the sample (8), and the step of examining the configuration of the sample (8) based upon phase information obtained from the electric field amplitude-time resolved waveforms detected.
摘要:
The invention relates to an integrated antenna for the emission or reception of terahertz radiation, characterised in that it comprises: a conductive ground plane (PM) deposited on a surface (S) of a dielectric or semiconductor substrate (SB); a conductive ribbon (RC) extending above the ground plane (PM) and forming an angle ( ) therewith in such a way as to form a horn-shaped radiating structure (SR) with electromagnetic transverse waves; and a planar wave guide (G) comprising at least one first conductive strip (BC1) and one second conductive strip (BC2) which are formed on the surface of the substrate and each linked to the conductive ribbon (RC) and to the ground plane (PM). The invention also relates to a terahertz emitter/receiver comprising such an antenna and a device for generating and/or detecting a terahertz signal, said device being built into the same substrate (SB) as the antenna and connected to the latter by the wave guide (G). The invention also relates to the production of such an antenna and to such an emitter/receiver.