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A reflective terahertz time-domain near-field scanning microscope

A terahertz time-domain and near-field scanning technology, applied in the terahertz field, can solve problems such as the inability to meet the imaging requirements of micron-scale samples and the limitation of imaging resolution of THz imaging systems, and achieve the advantages of large clinical applications and convenient detection.

Active Publication Date: 2020-04-07
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] According to the Rayleigh criterion, the imaging resolution of the traditional far-field THz imaging system is limited by the diffraction limit, and its resolution limit is generally half of the wavelength
In the terahertz band, the imaging resolution of traditional far-field systems cannot meet the imaging requirements of micron-scale samples

Method used

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  • A reflective terahertz time-domain near-field scanning microscope
  • A reflective terahertz time-domain near-field scanning microscope
  • A reflective terahertz time-domain near-field scanning microscope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step 1. Boot preparation

[0045] Turn on the switches of the control computer 1, lock-in amplifier 2, current amplifier 3, and adjustable voltage source 4. After everything is ready, turn on the femtosecond pulse laser 14. During this process, the optical path can be fine-tuned so that the laser is irradiated to the terahertz emission. And on the receiving module 7, use the lock-in amplifier 2 to observe the terahertz photocurrent, and adjust and optimize the experimental optical path.

[0046] Step 2. Acquisition of terahertz signal

[0047] Such as figure 1 As shown: femtosecond pulse laser 14 generates femtosecond pulse laser, which is divided into two beams by fiber coupling beam splitter 13 and transmitted in the first optical fiber 10 and the second optical fiber 11 respectively. The laser light transmitted in the first optical fiber 10 is used as the pumping laser light of the terahertz transmitting and receiving module 7, as shown in the attached image 3 As...

Embodiment 2

[0050] Step 1. Start up and prepare and place samples

[0051] Turn on the switches of the control computer 1, lock-in amplifier 2, current amplifier 3, and adjustable voltage source 4. After everything is ready, turn on the femtosecond pulse laser 14. During this process, the optical path can be fine-tuned so that the laser is irradiated to the terahertz emission. And on the receiving module 7, use the lock-in amplifier 2 to observe the terahertz photocurrent, and adjust and optimize the experimental optical path.

[0052] First lower the three-dimensional translational sample stage 5 and unscrew it, fix the sample to be tested 6 on a suitable position on the three-dimensional translational sample stage 5, then screw in and fix the three-dimensional translational sample stage 5, turn on the visible light source 8 and the host computer control The software adjusts the Z-axis of the three-dimensional translation sample stage 5, so that the three-dimensional translation sample s...

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Abstract

The invention relates to a reflective terahertz time-domain near-field scanning microscope and belongs to the technical field of terahertz. The device comprise a femtosecond pulse laser, an optical fiber coupling beam splitter, a first optical fiber, a second optical fiber, a terahertz transmitting and receiving module, a delay line module, a visible light source, a visible light microscope, a three-dimensional translation sample stage, an adjustable voltage source, a current amplifier, a lock-in amplifier and a control computer. The terahertz transmitting and receiving module comprises a terahertz transmitting antenna, a terahertz receiving antenna and a laser coupling focusing element. The device is simple in structure and high in precision, the defect in the traditional far field imaging technology that the resolution ratio is low is overcome, and the device is capable of acquiring terahertz detection spectrum and scan images with micron order spatial resolutions.

Description

technical field [0001] The invention belongs to the technical field of terahertz, and relates to a reflective terahertz time-domain near-field scanning microscope. Background technique [0002] Terahertz waves (Terahertz, THz) generally refer to electromagnetic waves with a frequency range of 0.1THz-10THz (wavelength range 0.03mm-3mm), which is between microwave and infrared radiation in the entire electromagnetic spectrum, and is in the transition from electronics to photons. learning transition zone. Since the vibration and rotation energy levels of most biological macromolecules are in the terahertz band, and because the terahertz photon energy is very low (a photon energy with a frequency of 1THz is 4.1meV), it will not cause ionization damage to substances, so terahertz technology It has a good application prospect in the field of biomedicine. [0003] According to the Rayleigh criterion, the imaging resolution of the traditional far-field THz imaging system is limite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3586G01N21/01
CPCG01N21/01G01N21/3586
Inventor 王化斌李早霞耿国帅杨忠波代广斌
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI