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Terahertz (THz) super-resolution imaging method and system

A technology of super-resolution and imaging methods, applied in the field of terahertz super-resolution imaging and systems, can solve the problems of low resolution of single-point scanning imaging, and achieve the effect of huge application potential, good signal-to-noise ratio, and reduced loss.

Inactive Publication Date: 2013-11-27
NANKAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low resolution of single-point scanning imaging, and to propose a THz imaging method and system that is simple in structure, easy to carry, and can stably produce super-resolution

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  • Terahertz (THz) super-resolution imaging method and system
  • Terahertz (THz) super-resolution imaging method and system

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Embodiment 1

[0051] Embodiment 1. Terahertz super-resolution two-dimensional imaging system

[0052] Such as figure 1 As shown, the terahertz super-resolution two-dimensional imaging system. The focusing lens and BBO crystal in the system form the THz pulse transmitter; the two-dimensional translation stage and the ceramic plate form the two-dimensional imaging device (see figure 2 ); The first and second off-axis parabolic mirrors form a THz signal collection device; thin-film polarization beam combiner, zinc antimonide crystal, quarter wave plate, Wollaston prism, first photodetector, second photoelectric The detector and the lock-in amplifier form a THz signal detector; the data processing part is a computer.

[0053] The 800nm ​​femtosecond laser is divided into two beams by the high-reflection mirror 1 after passing through the collimating diaphragm (not shown in the figure), the stronger one is the pump light, and the weaker one is the probe light.

[0054] After the detection light pa...

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Abstract

The invention relates to a Terahertz (THz) super-resolution imaging method and system. The system is characterized in that femto-second laser filamentation radiates THz light waves in the forward direction, light filaments is broken as a filamentation part, the radiated THz light waves interact with an article, the THz light waves carrying article information are collected, and the image of the article is restored after data processing. Experiments show that THz light spots produced through filamentation is one orders of magnitude smaller than light spots obtained through the traditional method of focusing THz with a lens, and the focus point is small enough at the light filament part, so that diffraction limit is broken through, and super-resolution imaging can be realized. THz super-resolution two-dimensional imaging has a great significance to acquiring images with super-high resolution in the aspects such as stain detection, biomedical imaging, nondestructive detection and the like.

Description

technical field [0001] The invention belongs to a super-resolution terahertz imaging (Terahertz Imaging) system, and relates to a method for sub-wavelength object imaging by using femtosecond laser filaments to generate terahertz imaging, which is of great significance to THz super-resolution imaging. Background technique [0002] THz waves usually refer to electromagnetic waves with a frequency in the range of 0.1-10THz and a wavelength of 30μm-3mm. The band is between microwave and infrared, and belongs to the category of far-infrared waves and submillimeter waves. THz has many outstanding advantages: 1. Compared with X-rays, the frequency of THz is lower, and the energy carried by THz photons is only one millionth of the energy carried by X-rays, which can perform non-destructive imaging on human body and objects; The vast majority of non-polar materials (Teflon, monocrystalline silicon, ceramic sheets, cloth, paper) have high permeability and strong reflectivity to meta...

Claims

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Application Information

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IPC IPC(8): G01N21/21
CPCG01N21/3581
Inventor 刘伟伟郭兰军赵佳宇
Owner NANKAI UNIV
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