Terahertz near-field imaging system and terahertz near-field imaging method

A terahertz near-field and imaging system technology, which is applied in the field of optical applications, can solve the problems of complex THz structure, harsh detector requirements, and low THz output power, and achieve the effects of simple structure, improved defects, and high precision

Active Publication Date: 2017-02-22
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a terahertz near-field imaging system and method, which is used to solve the complex structure of the THz near-field imaging system in the prior art, the low THz output power and the demanding issues

Method used

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Embodiment 1

[0043] The present invention provides a terahertz near-field imaging system, please refer to image 3 , which is a schematic structural diagram of the terahertz near-field imaging system, including a terahertz coherent light source module 1, an external cavity optical path module 2, and a near-field probe module 3; wherein: the terahertz coherent light source module 1 includes a terahertz light source 101 And the lock-in amplifier 102 connected with the terahertz light source 101; the external cavity optical path module 2 includes a first off-axis parabolic mirror 201 and a second off-axis parabolic mirror 202; the near-field probe module 3 includes a near-field Probe 301.

[0044] Specifically, the terahertz light source 101 is used to generate a terahertz signal and receive the reflection signal of the near-field terahertz signal of the sample 4 to generate a self-mixing effect in the resonant cavity of the terahertz light source 101 . In this embodiment, the terahertz cohe...

Embodiment 2

[0062] The present invention also provides a terahertz near-field imaging method, the method comprising: transmitting the reflection signal of the near-field terahertz signal of the sample to the light-emitting end face of the terahertz light source, and generating a self-mixing effect in the resonant cavity of the terahertz light source , and the signal extraction of the imaging sampling position is realized by detecting the self-mixing signal of the terahertz light source.

[0063] As an example, the terahertz light source may choose any terahertz wave generating device with a resonant cavity. In this embodiment, the terahertz light source is preferably a terahertz quantum cascade laser, which can generate high-power terahertz radiation, which is beneficial for signal detection.

[0064] As an example, the detection self-mixing signal selects the voltage signal or current signal of the terahertz light source, and selects the peak value within one modulation period as the res...

Embodiment 3

[0071] This embodiment provides a method for constructing a terahertz near-field imaging system, including the following steps:

[0072] Step 1: Construct a near-field imaging optical path system.

[0073] 1) Place the first off-axis parabolic mirror (hereinafter referred to as PM1) and the second off-axis parabolic mirror (hereinafter referred to as PM2) in the optical path of the external cavity on parallel optical tracks to facilitate the subsequent adjustment of the length of the external cavity;

[0074] 2) Place the visible light source at the focal point of PM1 for optical path calibration and sample position calibration, adjust the pitch angles of PM1 and PM2 according to the visible light mark, so that the converging spot of PM2 is at the same height as the visible light source, and the position of the spot coincides with the focal position of PM2. The light spot changes along the direction of the optical axis to present a uniform circular zoom;

[0075] 3) Determine...

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Abstract

The invention provides a terahertz near-field imaging system and a terahertz near-field imaging method. The terahertz near-field imaging system comprises terahertz coherent light source module, an external light path module and a near-field probe module. A high-power terahertz quantum-cascade laser is adopted to generate high-power THz (terahertz) radiation, a near-field terahertz signal of a target is detected through a probe technique and a self-mixing effect of the laser, and accordingly a high-resolution-rate imaging function is realized. The terahertz near-field imaging system and the terahertz near-field imaging method have the advantages that the self-mixing effect is adopted to substitute for a near-field detector, so that a light path system is simple and compact; the near-field terahertz signal reflected by the near-field probe shares a light path with an incident signal, so that the terahertz near-field imaging system is high in precision and simple in structure, defects of a traditional near-field imaging technique are overcome remarkably, and development and application of a high-precision terahertz near-field imaging technique is promoted positively.

Description

technical field [0001] The invention belongs to the technical field of optical applications, and relates to a terahertz near-field imaging system and method. Background technique [0002] Terahertz (THz) waves usually refer to electromagnetic waves with a frequency range of 100GHz to 10THz and corresponding wavelengths of 3mm to 30um. They are located between millimeter waves and far-infrared rays in the electromagnetic spectrum. Due to the lack of effective THz sources and detectors, The THz frequency band is the last of the electromagnetic spectrum to be fully and intensively studied ("Terahertz Gap"). In recent years, with the continuous development of photonics and nanotechnology, THz-related technologies have shown great application potential and value in the fields of public safety, communication transmission, biomedicine, product quality control, and atmospheric environment monitoring. Among the many THz research directions, THz imaging is regarded as one of the most...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3586G01J3/28
CPCG01J3/2823G01N21/3586
Inventor 周涛黎华曹俊诚
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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