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홍진수(Chinsoo Hong),김창교(Chang-Kyo Kim),이병욱(Byoung-Wook Lee),이명래(Myoung-Rae Lee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.4
The LGP with nanometer structures resulted in enhancement of optical efficiency. Its fundamental mechanism is to recycle the polarized light via one round-trip through QWP(Quarter-Wave Plate) but the maximum efficiency to reach with this method is limited up to 2. To get the larger efficiency than this limited one a LGP with nanometer-patterned grating is suggested. For its optimum design the computer simulation is performed and suggests a grating that the spatial frequency between adjacent patterns is 500nm, its height 250nm, duty cycle 50%, and its cross section is rectangular. On the basis of simulation results the LGP with nanometer-patterned grating is fabricated and its optical properties such as angular intensity distribution and CIE color coordinates are characterized. The angles of transmitted light are nearly the same as the results expected from the generalized Snell"s law. Thus the Mathematica code, developed in this experiment, will be applied to designing the optimized LGP. The LGP with nanometer-patterened grating shows the enhancement of transmitted intensity distribution up to 4.9 times.
홍진수(ChinSoo Hong),김창교(Chang-Kyo Kim),이병욱(Byoung-Wook Lee),김경래(Kyoung-Rae Kim) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.6
The LGP with nanometer structures resulted in enhancement of optical efficiency. Its fundamental mechanism is to recycle the polarized light via one round-trip through QWP(Quarter-wave Plate) but the maximum efficiency to reach with this method is limited up to 2. To get the larger efficiency than this a LGP with 1D PC( one-dimensional photonic crystal) nanometer-patterned on its top and bottom surfaces is suggested. For its optimum design the computer simulation is performed and suggests a grating that the spatial frequency between adjacent patterns is 500nm, its height 250nm, duty cycle 50%, and its cross section is rectangular. The angles of transmitted light are nearly the same as the results expected from the generalized Snell’s law. Thus the Mathematica code, developed in this experiment, will be applied to designing the optimized LGP. The LGP with nanometer-patterened 1D PC LGP on its both surfces shows the enhancement of transmitted intensity distribution up to 5.7 times.
PLD 박막의 면적 질량을 위한 in-situ QCM 모니터 제작
홍진수,신정희 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
The quartz crystal micorbalance is finding many novel uses beyond its traditional utility as a thin film deposition controller. As in-situ setup in harsh environment such as laser-produced plasma this device was tested to measure the area-mass density of deposited DLC film on the gold-coated quartz crystal. The results shows that the measurable mass of deposited film is 33㎎, and that the 22minute deposited masses are 1.59g and 1g, respectively, at two positions. The shift of quartz resonant frequency is found to nearly linear decrease with time. More efforts needs to improve its linearity.
홍진수,김성기 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
The plasma generated by a pulsed laser has been investigated using a Faraday cup. With the voltage measurement of a oscilloscope ion and electron energy distributions were measured. Mean ion energies were found to be 7.5keV. Also, the internal impedance of the Faraday cage was found to be 100Ω.
정재훈,홍진수,박해윤 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
Thin amorphous carbon film were deposited by Q Nd:YAG 532nm laser ablation from 99.7% graphite target with beam power density of 6x10 15 Wcm-2. In order to estimate the quality of the PLD(Pulsed Laser Deposition) film one of the most important optical properties, bandgap energy, was characterized by visible transmission and an optical bandgap energy of 2.05eV was achieved. Comparing our result with the published values in the literature we have confidence that our film shows the good quality at optical properties.
AAO 나노기공을 나노 임프린트 리소그래피의 형틀로 이용한 PMMA 나노패턴 형성 기술
이병욱(Byoung-Wook Lee),홍진수(Chinsoo Hong),김창교(Chang Kyo Kim) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.5
PMMA light guiding plate with nano-sized pattern was fabricated using anodized aluminum oxide membrane as a template for nano imprint lithography. Nano-sized pore arrays were prepared by the self-organization processes of the anodic oxidation using the aluminum plate with 99.999% purity. Since the aluminum plate has a rough surface, the aluminum plate with thickness of 1mm was anodized after the pre-treatments of chemical polishing, and electrochemical polishing. The surface morphology of the alumina obtained by the first anodization process was controlled by the concentration of electrochemical solution during the first anodization. The surface morphology of the alumina was also changed according to temperature of the solution during chemical polishing performed after first anodization. The pore widening process was employed for obtaining the one-channel with flat surface and height of the channel because the pores of the alumina membrane prepared by the fixed voltage method shows the structure of two-channel with rough surface. It is shown from SPM results that the nano-sized pattern on PMMA light guiding plate fabricated by nano imprint lithography method was well transferred from that of anodized aluminum oxide template.
전처리공정이알루미늄얌극산화법에의해제조된규칙적인나노급미세기공의형성에미치는영향
이재홍,이병욱,김창교,홍진수,Lee Jae-Hong,Lee Byung-Wook,Kim ChangKyo,Hong Chinsoo 대한전기학회 2005 전기학회논문지C Vol.54 No.6
Nano-sizedporearrayswerepreparedbytheself-organizationprocessesoftheanodicoxidationusingthealuminumplatewith99.999$\%$purity.Sincethealuminumplatehasaroughsurface,thealuminumplateof1mmthicknesswasanodizedafterthepre-treatmentsofpressing,mechanicalpolishing,thermaloxidation,chemicalpolishing,andelectrochemicalpolishing.Thediameterofthenano-sizedporesandthethicknessofbarrierlayercanbecontrolledbyappliedvoltage.Thethicknessofaluminamembranecanalsobecontrolledbytheanodizingcurrent.Thenano-sizedporeswithdiameterof60$\~$120nm,thedistancebetweenthenearestporesof30$\~$60nm,andthethicknessof6$\~$7Wwereobtainedbytheanodicoxidationprocess.Theporewideningprocesswasemployedforobtainingtheone-channelwithflatsurfacebecausetheporesofthealuminamembranepreparedbythefixedvoltagemethodshowsthestructureoftwo-channelwithroughsurface.