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진윤식,류홍제,김종수,임근희,임수원 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
A discharge in water with a long gap was realized at low voltage. The main feature of this discharge was the assistance of a high pressure gas jet. For a gap length of 5 cm in tap water, the discharge or breakdown voltage was as low as 32 kV, which is five times lower than that of air-gap breakdown. The breakdown voltage increased linearly with the gap distance. Helium, nitrogen, argon and air were used as injection gases. The discharge characteristics were investigated as a functions of the injection gas species, the gap distance and the back pressure of the injection gas. Comparison of the discharge voltage with water surface discharge suggested that the gas jet assisted water discharge is a kind of surface discharge. The long gap discharge in water can be utilized for many environmental applications, such as wastewater treatment.
진윤식,김근주,손채화,정순신,김지현,전석기 대한전기학회 2005 전기학회논문지C Vol.54 No.6(C)
Terahertz wave is a kind of electromagnetic radiation whose frequency lies in 0.1THz ~ 10THz range. In this paper, generation and detection characteristics of terahertz (THz) radiation by photoconductive antenna (PCA) method has been described. Using modern integrated circuit techniques, micron-sized dipole antenna has been fabricated on a low-temperature grown GaAs (LT-GaAs) wafer. A mode-locked Ti:Sapphire femtosecond laser beam is guided and focused onto photoconductive antennas (emitter and detector) to generate and measure THz pulses. Ultra-wide band THz radiation with frequencies between 0.1 THz and 3 THz was observed. Terahertz field amplitude variation with antenna bias voltage, pump laser power, pump laser wavelength and probe laser power was investigated. As a primary application example, a live clover leaf was imaged with the terahertz radiation.
Terahertz Dielectric Properties of Polymers
진윤식,김근주,전석기 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.2I
The terahertz dielectric properties of polymers were characterized by transmission terahertz timedomain spectroscopy (THz-TDS) in the frequency range extending from 0.2 to 3.0 THz. The terahertz absorption spectra, the refractive indices and the dielectric functions of various polymer materials were measured and compared. The variation of the refractive index of the polymers was less than 6 %, ranging from 1.4 to 1.8, within the investigated frequency range, but the absorption properties of the polymers showed very different frequency-dependent behaviors. The loss mechanism for terahertz radiation in polymers is discussed by correlating the absorption coefficients and the loss tangents (tan ) of the materials.j