A method and system for improving the resolution of terahertz pulse imaging

Abstract

The invention provides a method and system for improving the resolution of terahertz pulse imaging. The system includes: a terahertz pulse generator, a dielectric microsphere, a grating to be measured, a scanning platform and a computer, wherein: the terahertz pulse generator is used to generate a terahertz wave; between the generator and the grating to be measured, and the dielectric microsphere is placed at the focal point of the spot formed by the terahertz pulse wave; the scanning platform is used to obtain the terahertz wave passing through the dielectric microsphere irradiate the imaging points of the area to be scanned of the grating to be measured; the computer is used to process the acquired imaging points to determine the terahertz pulse imaging. The resolution of the terahertz imaging obtained by the present invention can exceed the diffraction limit, and is an order of magnitude higher than that of conventional far-field terahertz imaging.

Description

technical field [0001] The invention relates to the field of terahertz technology, in particular to a method and system for improving the resolution of terahertz pulse imaging. Background technique [0002] Terahertz imaging technology, because of its unique analysis capabilities such as low energy, high transmittance, wide spectral range, and high spatial resolution, has shown great advantages and potential applications in the fields of biomedicine, security inspection, aerospace, etc. value. At present, it has shown good application prospects in determining the canceration of biological tissues, detecting concealed weapons, detecting drugs and explosives, packaging detection and quality control. In recent years, with the discovery and application of a series of new technologies and new materials, terahertz science and technology have achieved unprecedented new developments. At the same time, terahertz imaging technology has also been continuously developed. Higher perfor...

AI Technical Summary

Problems solved by technology

[0003] At present, in the usual far-field terahertz imaging system, due to the long wavelength of terahertz radiation, the limitation of its diffraction effect often makes the imaging resolution only reach the order of millimeters

Traditional methods to improve the resolution of terahertz imaging systems are mainly from the improvement of terahertz imaging methods and attempts in image processing, including terahertz near-field imaging technology, terahertz confocal scanning imaging, and image restoration of terahertz images. These methods can improve the resolution of terahertz imaging, but most of them are at the cost of loss of energy and spectral information, and have problems such as complex operation and difficulty in extracting information.

[0004] In traditional optical microscopy techniques, the imaging resolution of traditional optical microscopes is limited to about 200nm. The traditional method of terahertz imaging resolution has the disadvantages of limited sensitivity and signal-to-noise ratio, loss of spectral components, and low conversion efficiency of THz radiation.

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