Skip to content

Center for THz-driven Biological Systems


Dielectric Relaxation Spectroscopy


그림1-1.jpg 그림1-2.jpg


 The dielectric relaxation spectroscopy measures the dielectric constant of a sample as a function of frequency. It is based on the interaction of external electromagnetic field with the dipole moment of the sample. We focused on the rotational relaxation of water molecules lies in GHz (slow water) to THz (fast water) range.



Vector Network Analyzer (VNA) with Open-Ended Coaxial Dielectric Probe




 The open-ended dielectric probe (Keysight) is used to determines the dielectric constant of liquid samples such as salts or biomolecular solutions with an Anritsu Vector Star network analyzer. The slim form probe has a frequency range of 0.5 GHz to 40 GHz.



Ternary Liquid Calibration Method




 Instead of widely used calibration method (air, metal and short), three reference liquid is used for calibration protocol. After home-built calibration and optimization process, it gives reliable results for both low and high polarizable liquids (Measured: Circles, From literatures: Lines).



Terahertz Time-Domain Spectroscopy


그림4-1.jpg 그림4-2.jpg


 The commercial Advantest THz time-domain spectroscopy (Advantest) with ATR geometry is used to determine dielectric constants of liquid samples such as salts or biomolecular solutions from 0.25 THz to 1.5 THz frequency range with precise temperature control.


그림5-1.jpg 그림5-2.jpg


 The home-built THz time-domainspectroscopy using photoconductive antenna is used to measure dielectric constant of solid or liquid samples with transmission geometry. 



Ultrafast THz Pump/Probe Spectroscopy for Water




 The ultrafast THz pump – optical/THz probe spectroscopy is used to measure the ultrafast dynamics of water around biological molecules such as lipids and DNA. For the THz generation, the DSTMS organic crystal is used to obtain field intensity above 1 MV/cm. (under construction)


Powered by Xpress Engine / Designed by Sketchbook

sketchbook5, 스케치북5

sketchbook5, 스케치북5

나눔글꼴 설치 안내

이 PC에는 나눔글꼴이 설치되어 있지 않습니다.

이 사이트를 나눔글꼴로 보기 위해서는
나눔글꼴을 설치해야 합니다.

설치 취소