Two-dimensional plasma lattice grating enhanced laser-induced breakdown spectroscopy detection sensitivity device

A laser-induced breakdown and plasma technology, applied in the field of spectral detection, can solve the problems of matrix effect and low detection sensitivity, and achieve the effects of improving efficiency, enhancing spectral signal, and improving detection sensitivity

Pending Publication Date: 2022-02-15
YUNNAN HUAPU QUANTUM MATERIAL CO LTD +6
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to improve the prior art, the object of the present invention is to provide a device based on a two-dimensional plasmonic lattice grating to enhance the detection sensitivity of laser-induced breakdown spectros...

Method used

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  • Two-dimensional plasma lattice grating enhanced laser-induced breakdown spectroscopy detection sensitivity device
  • Two-dimensional plasma lattice grating enhanced laser-induced breakdown spectroscopy detection sensitivity device
  • Two-dimensional plasma lattice grating enhanced laser-induced breakdown spectroscopy detection sensitivity device

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Effect test

Embodiment 1

[0048] In order to better understand the position of the three beams of light and the better excitation effect of the three beams of light, the following combination figure 2 Describe in detail. Such as figure 2 Shown is a schematic diagram of a 1D plasmon grating and a 2D plasmon grating pair, where (a) describes the interaction of two beams of light to form a 1D plasmon grating, and a 1D periodic grating appears on the cross section perpendicular to the plasma channel The structure breaks through the optical power clamping effect, and the optical power density and electron density in the plasma channel have been increased by an order of magnitude.

[0049] The figure (b) describes a combination method to form a two-dimensional plasmonic grating, and the beam 1 corresponds to figure 1 In the laser pulse passing through lens C, beam 2 corresponds to figure 1 In the laser pulse passing through lens B, beam 3 corresponds to figure 1 A laser pulse in A. figure 2 (b) Beam ...

Embodiment 2

[0051] Such as figure 2 Shown is a comparison of the excitation lines of the single filament, one-dimensional plasmonic grating, and two-dimensional plasmonic grating for the same soil sample GSS-09. Among them, a lens with a focal length of 20cm is used for focusing. The distance between the lenses used for the one-dimensional plasma grating and the two-dimensional plasma grating is 4cm, and the angle between the corresponding filaments is about 10°, and the period of the grating is 4μm. . The figure compares the intensity of the Si 288.17nm spectral line under the three excitation modes. It can be seen that under the same laser power, time delay, gate width and other parameters, the effect of one-dimensional plasmonic grating excitation is better than that of The excitation effect of single filament and the excitation effect of two-dimensional plasma grating is better than that of one-dimensional plasma grating.

Embodiment 3

[0053] Take the standard soil GSS-9 as the sample, after fully drying, grind and refine, take 0.3g powder and press it with a hydraulic press at a pressure of 8MPa for 2 minutes to obtain a soil tablet sample with a diameter of 13mm for testing. The sample is excited by a femtosecond laser pulse with a wavelength of 800nm, a repetition rate of 1000Hz, and a single pulse laser energy of 2mJ. The spectrometer is set with an acquisition delay of 0ns and a gate width of 200ns for collection. Two-dimensional plasmonic lattice grating and one-dimensional plasmonic grating are used to excite the sample, and the obtained spectral signal intensity is as follows: image 3 As shown, taking the three spectral lines of Mg II 280.261nm, Mg I 285.193nm and Si I 288.175nm as examples, the spectrum induced by the two-dimensional lattice plasmonic grating is enhanced compared with the one-dimensional plasmonic grating.

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Abstract

The invention discloses a two-dimensional plasma lattice grating enhanced laser-induced breakdown spectroscopy detection sensitivity device. The device comprises a femtosecond laser, a beam splitting module, a time domain synchronization module, a focusing module, a loading module, a spectrum collection module and a polarization adjustment module. The method comprises the following specific implementation steps: splitting a femtosecond laser pulse into a plurality of femtosecond laser pulses, performing time domain synchronization, focusing to form light filaments, performing cross interaction, performing nonlinear coupling in a light filament overlapping area to form a two-dimensional plasma lattice grating, exciting a sample, and finally collecting and analyzing a spectrum emitted by the sample. According to the invention, additional sample pretreatment steps are not needed, the original advantages of simple operation, rapidness, real-time performance and the like of LIBS are reserved, and a better detection effect can be achieved on elements in some application scenes where samples are difficult to excite.

Description

technical field [0001] The invention belongs to the technical field of spectral detection, and in particular relates to a LIBS spectral signal enhancement device based on two-dimensional plasma lattice grating enhancement Background technique [0002] With the development of society, people need more and more detection of elements in samples. Taking the most basic agriculture as an example, it has become an urgent need for modern agriculture to analyze elements in soil and crops to evaluate whether they meet the standards. Toxic metal pollution and nutrient management are two major issues in agricultural production. Among them, toxic metals such as arsenic (As), selenium (Se), cadmium (Cd), lead (Pb), chromium (Cr), and mercury (Hg) can combine with sulfur, nitrogen, and oxygen functional groups in biomolecules, thereby interfering with, for example, The normal function of biological structures such as structural proteins, enzymes and nucleic acids. In addition, macronutri...

Claims

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Application Information

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IPC IPC(8): G01N21/71G01N21/64G01N21/01
CPCG01N21/718G01N21/6402G01N21/01
Inventor 曾和平胡梦云施沈城
Owner YUNNAN HUAPU QUANTUM MATERIAL CO LTD
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