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Quick dynamic terahertz near field imaging system based on photoconductive antenna array and construction method thereof

A photoconductive antenna and terahertz near-field technology, applied in the field of terahertz imaging, can solve problems such as lack of

Active Publication Date: 2019-03-19
JIANGNAN UNIV
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  • Abstract
  • Description
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  • Application Information

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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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  • Quick dynamic terahertz near field imaging system based on photoconductive antenna array and construction method thereof
  • Quick dynamic terahertz near field imaging system based on photoconductive antenna array and construction method thereof
  • Quick dynamic terahertz near field imaging system based on photoconductive antenna array and construction method thereof

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Embodiment 1

[0029] like 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 studied,...

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Abstract

The invention discloses a quick dynamic terahertz near field imaging system based on a photoconductive antenna array and a construction method thereof. The method comprises the following steps: preparing an optimized probe unit structural design; micro-processing and manufacturing the photoconductive antenna array; and carrying out gating activation on a probe array by using a spatial optical modulator and constructing a pulse terahertz imaging system. Compared with the prior art, the system and the method have the following advantages: (1) the quick dynamic terahertz near field imaging systembased on the photoconductive antenna array achieves the photoconductive antenna array which detects terahertz waves efficiently, and the resolution of the system is superior to lambda / 10 and the unitsignal-noise ratio is superior to 70 dB; and (2) the system carries out gating activation on the photoconductive antenna array by using the spatial optical modulator and combines a multichannel lockphase amplification technique, so that a dynamic, flexible, efficient and rapid data acquisition method is achieved.

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 Applications(China)
IPC IPC(8): G01N21/3581
CPCG01N21/3581
Inventor 李璟文
Owner JIANGNAN UNIV
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