Integrated terahertz wave far-field super-diffraction focusing imaging system

Abstract

The invention discloses an integrated terahertz wave far-field ultra-diffraction focusing imaging system, relates to the technical field of terahertz wave imaging, and solves the problems that the conventional terahertz wave imaging technology is based on the near-field optical principles although the conventional terahertz wave imaging technology achieves the super-resolution imaging. The conventional imaging technology has the problems that the focal length is very small, the dynamic focusing cannot be achieved, the width is narrower and the diffraction efficiency is smaller. The main pointsof the technical scheme are that the system comprises a terahertz wave source, an optical pump, a terahertz wave focusing device and a main control circuit. The terahertz wave source is used for emitting the terahertz waves, and the optical pump is used for generating continuous visible light to irradiate the terahertz wave focusing device. The terahertz wave focusing device is used for changingthe transmissivity of terahertz waves, and the main control circuit is used for applying a bias voltage to the terahertz wave focusing device. The system is large in focal length, achieves the ultra-diffraction limiting resolution, achieves the dynamic focusing, increases the bandwidth, and improves the diffraction efficiency.

Description

technical field [0001] The invention relates to the technical field of terahertz wave imaging, more specifically, it relates to an integrated terahertz wave far-field super-diffraction focusing imaging system. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency of 0.1-10 THz. This band contains rich spectral information, such as the rotation / oscillation spectrum of macromolecules including proteins, and the lattice vibration energy spectrum of solid materials. Compared with microwaves and light waves, terahertz waves have the characteristics of low energy, strong penetrating power, high safety, and rich spectral information, and have important application prospects in nondestructive testing, security inspection, medical imaging, and communication. [0003] The development and application of terahertz imaging technology put forward higher requirements for focusing spot and imaging resolution. In recent years, some progress has been m...

AI Technical Summary

Problems solved by technology

[0004] Although the existing terahertz wave imaging technology has achieved super-resolution focusing, they are all based on the principle of near-field optics; there are problems such as extremely small focal length, inability to dynamically adjust focus, narrow width, and low diffraction efficiency.

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