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Fast dynamic terahertz near-field imaging system based on photoconductive antenna array and its construction method

A photoconductive antenna, terahertz near-field technology, applied in the field of terahertz imaging, can solve problems such as lack, and achieve the effects of high-speed terahertz imaging, shortening imaging time, and fast data acquisition methods

Active Publication Date: 2021-08-10
JIANGNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of a flexible, efficient, and fast array-gated excitation method, most of the current research reports (and commercial photoconductive antennas) are limited to the structural design and performance research of single-point antenna elements.

Method used

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  • Fast dynamic terahertz near-field imaging system based on photoconductive antenna array and its construction method
  • Fast dynamic terahertz near-field imaging system based on photoconductive antenna array and its construction method
  • Fast dynamic terahertz near-field imaging system based on photoconductive antenna array and its construction method

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Embodiment 1

[0029] Such as figure 1 As shown, the construction method of the fast dynamic terahertz near-field imaging system based on the photoconductive antenna array includes the following steps:

[0030] Step 1. Design of Photoconductive Antenna Array

[0031] The detection performance (efficiency, bandwidth, resolution, and signal strength) of a photoconductive antenna mainly depends on the following factors: substrate material properties (such as carrier lifetime, dark resistivity, carrier mobility, etc.), antenna structure and Size, and gated laser characteristics (such as intensity, pulse width, focus position, spot size, etc.). Therefore, the selection of the substrate material and its process, the design of the antenna structure and size, and the selection of the working mode are very important to realize efficient terahertz detection.

[0032] In order to facilitate the array and integration of photoconductive antennas, two different dipole antenna structures are mainly studi...

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Abstract

The invention discloses a fast dynamic terahertz near-field imaging system based on a photoconductive antenna array and a construction method thereof. The method includes the following steps: preparing an optimized detection unit structure design, micro-manufacturing of the photoconductive antenna array, realizing utilization of space The light modulator performs gated excitation on the detection array and builds a pulsed terahertz imaging system. Compared with the prior art, the present invention has the following advantages: (1) The fast dynamic terahertz near-field imaging system based on the photoconductive antenna array of the present invention realizes the photoconductive antenna array for efficient detection of terahertz waves, and the resolution is better than λ / 10, the unit signal-to-noise ratio is better than 70dB; (2) The system uses a spatial light modulator to gated and excite the photoconductive antenna array, and combines multi-channel lock-in amplification technology to realize a dynamic, flexible and efficient , Fast data collection method.

Description

technical field [0001] The invention belongs to terahertz imaging technology, and relates to a terahertz imaging system, in particular to a fast dynamic terahertz near-field imaging system based on a photoconductive antenna array and a construction method thereof. Background technique [0002] Terahertz imaging technology was originally developed on the basis of time-domain spectroscopy systems. In a typical terahertz imaging system, the sample is usually placed in the terahertz system, and the transmission or reflection information at different positions of the sample is recorded by using a two-dimensional scanning platform to move the sample or a single-point detector. The terahertz time-domain waveform is extracted for each pixel of the sample, and the sample image is reconstructed through data processing. Since Hu et al first used transmission terahertz point-by-point scanning imaging technology to image the internal structure of the chip and the water content of leaves...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3581
CPCG01N21/3581
Inventor 李璟文
Owner JIANGNAN UNIV
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