High-field Terahertz spinning emitter and spectrometer

Abstract

An embodiment of the invention provides a high-field Terahertz spinning emitter and a spectrometer. The high-field Terahertz spinning emitter comprises a ferromagnetic nanometer film in a preset sizeand first and second magnets; the first and second magnets are both fixed in the plane where the ferromagnetic nanometer film is fixed and are arranged in one straight line, a first pole of the firstmagnet is arranged opposite to a second pole of the second magnet, the polarity of the first pole is opposite to that of the second pole, and the ferromagnetic nanometer film is arranged between the first and second poles; and pumped laser in the preset pulse width with preset single pulse energy penetrates the ferromagnetic nanometer film to generate Terahertz pulse radiation in the preset spectral width and preset radiation field intensity. The high-field Terahertz spinning emitter can generate ultra-wideband high-field Terahertz pulse radiation, and overcome disadvantages when the high-field Terahertz pulse radiation is generated in the prior art.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of terahertz pulse generation, and more particularly, to a strong-field terahertz spin transmitter and a spectrometer. Background technique [0002] Terahertz radiation is located between the far-infrared and millimeter waves on the electromagnetic spectrum. The special position of this frequency band endows this frequency band with special properties. For example, the terahertz frequency corresponds to the vibrational and rotational energy levels of biological macromolecules, and corresponds to the energy level of water molecules. Hydrogen bond energy and van der Waals force energy, many biomolecules have fingerprint spectra in this frequency band, which can be used in material identification and identification; the terahertz frequency band means greater information capacity, providing more information for communication, remote sensing, aerospace and aerospace. good means of commun...

AI Technical Summary

Problems solved by technology

The biggest challenge of such organic crystals is that the crystal size cannot be grown larger, the damage threshold is very low, the price is extremely expensive, and it is easy to deliquescence and very unstable.

Such a terahertz radiation source is still difficult to use in low-energy terahertz equipment, let alone used in pump lasers to obtain stable and reliable strong-field terahertz output

Moreover, since the crystal is easily affected by moisture and damaged by laser light, the crystal needs to be replaced irregularly, which not only increases the cost of the equipment, but also brings uncertainty to the test data.

(3) The terahertz radiation source based on two-color plasma, although it can produce ultra-broadband terahertz radiation with a spectrum of 1-10THz and no damage threshold, but the spectral width is determined by the pulse width of the pump laser, and the formed terahertz radiation The source is unstable and the efficiency is low. The signal-to-noise ratio of the terahertz system built by the terahertz radiation source is not high, and it is difficult to obtain stable and reliable test data.

Moreover, in high-energy and strong-field terahertz radiation sources, the emission efficiency is limited by the shielding effect of charges, making it difficult to improve the radiation efficiency

And so far, those skilled in the art are still unclear about the emission mechanism of the two-color plasma-based terahertz radiation source

(4) Although the high-energy strong-field terahertz radiation source obtained based on the transition radiation mechanism of the interaction between strong laser and matter can cover the ultra-broadband frequency range of 0.3-30THz, the repetition frequency of the pump laser used to generate terahertz radiation is very It is extremely difficult to apply such a terahertz radiation source in subsequent applications, for example, it is difficult to carry out experimental research on ultrafast time-resolved dynamics, and it cannot be well used in extreme terahertz science and technology, making such a terahertz The radiation source is still in the laboratory mechanism research and development stage

However, the frequency of such terahertz radiation sources is generally high, and it is difficult to extend to below 15THz

However, the frequency band below 15THz is considered to be the most applicable terahertz frequency band in the condensed matter system, because the phonon vibration frequency of many condensed matter systems happens to fall in this frequency band, and it is difficult to extend to this most useful frequency band by optical difference frequency. frequency band

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