研究目的
To demonstrate a method for observing dielectric loading of hydrocarbons into a porous coordination polymer nanocrystal using terahertz near-field phase contrast imaging.
研究成果
The differential method enables probing of few hundred nanograms of weakly absorbing material, significantly reducing the required sample size for detection, sensing, and imaging in the THz range.
研究不足
The method may be time-consuming due to raster scanning, and quantitative analysis could be difficult without exact spatial distribution knowledge. Sensitivity might still be limited for very weakly absorbing materials.
1：Experimental Design and Method Selection:
The method combines single-shot THz near-field imaging with a resonator device consisting of two metallic ring structures. One ring is loaded with a dynamically evolving porous coordination polymer (PCP) nanocrystal undergoing molecular adsorption. The spectroscopic information is extracted by differentiating the near-field dynamics between the two rings, with one acting as a reference.
2：Sample Selection and Data Sources:
The sample is a Cu3(btc)2 porous coordination polymer nanocrystal placed in one metallic ring. Data is acquired under controlled gas flows (helium and methanol vapor).
3：List of Experimental Equipment and Materials:
Intense THz pulses, electro-optic crystal for near-field detection, metallic ring structures, miniature controlled gas cell, Cu3(btc)2 sample.
4：Experimental Procedures and Operational Workflow:
The sample is placed on the top surface of the EO crystal. THz near-field distribution is imaged under different gas conditions (helium and methanol vapor). The system is raster-scanned for spatial resolution.
5：Data Analysis Methods:
The phase difference between the near-field responses of the two resonators is spatially resolved to extract spectroscopic information.
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