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유한차분 시간영역 방법을 이용한 Ag 나노링 구조의 산란효과
이태수,정종율,Lee, Tae-Soo,Jeong, Jong-Ryul 한국재료학회 2012 한국재료학회지 Vol.22 No.10
Enhancement of light trapping in solar cells is becoming increasingly urgent for the development of next generation thin film solar cells. One of the possible candidates for increasing light trapping in thin film solar cells that has emerged recently is the use of scattering from metallic nanostructures. In this study, we have investigated the effects of the geometric parameters of Ag nanorings on the light scattering efficiency by using three dimensional Finite Different Time Domain (FDTD) calculations. We have found that the forward scattering of incident radiation from Ag nanorings strongly depends on the geometric parameters of the nanostructures such as diameter, height, etc. The forward scattering to substrate direction is increased as the outer diameter and height of the nanorings decrease. In particular, for nanorings larger than 200 nm, the inner diameter of Ag nanorings should be optimized to enhance the forward scattering efficiency. Light absorption and scattering efficiency calculations for the various nanoring arrays revealed that the periodicity of nanorings arrays also plays an important role in the absorption and the scattering efficiency enhancement. Light scattering efficiency calculations for nanoring arrays also revealed that enhancement of scattering efficiency could be utilized to enhance the light absorption through the forward scattering mechanism.
3차원 FDTD Simulation을 이용한 자기조립된 Ag 나노입자의 국소표면플라즈몬공명 상호작용 현상 연구
이경민,윤순길,정종율,Lee, Kyung-Min,Yoon, Soon-Gil,Jeong, Jong-Ryul 한국재료학회 2014 한국재료학회지 Vol.24 No.8
In this study, we investigated localized surface plasmon resonance and the related coupling phenomena with respect to various geometric parameters of Ag nanoparticles, including the size and inter-particle distance. The plasmon resonances of Ag nanoparticles were studied using three-dimensional finite difference time domain(FDTD) calculations. From the FDTD calculations, we discovered the existence of a symmetric and an anti-symmetric plasmon coupling modes in the coupled Ag nanoparticles. The dependence of the resonance wavelength with respect to the inter-particle distance was also investigated, revealing that the anti-symmetric mode is more closely correlated with the inter-particle distance of the Ag nanoparticles than the symmetric mode. We also found that higher order resonance modes are appeared in the extinction spectrum for closely spaced Ag nanoparticles. Plasmon resonance calculations for the Ag particles coated with a $SiO_2$ layer showed enhanced plasmon coupling due to the strengthened plasmon resonance, suggesting that the inter-particle distance of the Ag nanoparticles can be estimated by measuring the transmission and absorption spectra with the plasmon resonance of symmetric and anti-symmetric localized surface plasmons.
이예림,박승영,정종율,Lee, Yelim,Phuoc, Cao Van,Park, Seung-Young,Jeong, Jong-Ryul 한국재료학회 2015 한국재료학회지 Vol.25 No.12
In this study, we investigated the effect of annealing conditions on the ferromagnetic resonance(FMR) of yttrium iron garnet ($Y_3Fe_5O_{12}$, YIG) thin film prepared on gadolinium gallium garnet ($Gd_3Ga_5O_{12}$, GGG) substrate. The YIG thin films were grown by rf magnetron sputtering at room temperature and were annealed at various temperatures from 700 to $1000^{\circ}C$. FMR characteristics of the YIG thin films were investigated with a coplanar waveguide FMR measurement system in a frequency range from 5 to 20 GHz. X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS) were used to characterize the phase formation, crystal structure and composition of the YIG thin films. Field dependent magnetization curves at room temperature were obtained by using a vibrating sample magnetometer(VSM). The FMR measurements revealed that the resonance magnetic field was highly dependent on the annealing condition: the lowest FMR linewidth can be observed for the $800^{\circ}C$ annealed sample, which agrees with the VSM results. We also found that the Fe and O composition changes during the annealing process play important roles in the observed magnetic properties.
MgO(100) 기판 위에 증착된 Ag/CoFeB 박막의 스퍼터링 조건에 따른 미세성장구조 변화 연구
전보건(Bo-Geon Jeon),정종율(Jong-Ryul Jeong),Hirokazu Takahash,Masakiyo Tsunoda,Migaku Takahashi 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.6
In this study, we have systematically investigated the effect of sputtering conditions on the microstructural properties of Ag/CoFeB thin film on MgO substrate. It was found that the crystallinity and surface roughness of the Ag film strongly depends on the Ar sputtering pressure and sputtering power. Epitaxial growth of Ag(100) film on MgO(100) substrate was achieved under the sputtering conditions of high sputtering power and elevated temperature. XRR (X-ray reflectivity) and high-resolution TEM (transmission electron microscopy) measurements also revealed the interfacial roughening in the Ag/CoFeB interface due to the island structure formation and intermixing between Ag and CoFeB.
나노크기 표면 요철을 이용한 GaN LED의 광추출효율 향상
정재우,김사라,정준호,정종율,Jung, Jae-Woo,Kim, Sarah,Jeong, Jun Ho,Jeong, Jong-Ryul 한국재료학회 2012 한국재료학회지 Vol.22 No.11
In this study, we have investigated highly efficient nanoscale surface corrugated light emitting diodes (LEDs) for the enhancement of light extraction efficiency (LEE) of nitride semiconductor LEDs. Nanoscale indium tin oxide (ITO) surface corrugations are fabricated by using the conformal nanoimprint technique; it was possible to observe an enhancement of LEE for the ITO surface corrugated LEDs. By incorporating this novel method, we determined that the total output power of the surface corrugated LEDs were enhanced by 45.6% for patterned sapphire substrate LEDs and by 41.9% for flat c-plane substrate LEDs. The enhancement of LEE through nanoscale surface corrugations was studied using 3-dimensional Finite Different Time Domain (FDTD) calculation. From the FDTD calculations, we were able to separate the light extraction from the top and bottom sides of device. This process revealed that light extraction from the top and bottom sides of a device strongly depends on the substrate and the surface corrugation. We found that enhanced LEE could be understood through the mechanism of enhanced light transmission due to refractive index matching and the increase of light scattering from the corrugated surface. LEE calculations for the encapsulated LEDs devices also revealed that low LEE enhancement is expected after encapsulation due to the reduction of the refractive index contrast.
고온열분해법을 이용하여 제조된 산화철 나노입자의 자성특성 연구
이성우(Sung-Woo Lee),정종율(Jong-Ryul Jeong),최규석(Gyu-Seok Choi) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.2
In this study, iron oxide nanoparticles were synthesized by thermal decomposition method using Fe(acac)₃ and 1- hexadecanol at 330 ℃. TG-DSC is one of the most important characterization techniques to study the Fe₃O₄ nanoparticles generation and growth from reduced mass and endothermal reaction. Analysis of TEM and XRD results yield the average sizes of synthesized spherical magnetite nanoparticles with sizes of 10㎚. We could determine the saturation magnetization and coercivity value using the VSM. ZFC and FC curves measured at 100 Oe with the T<SUB>B</SUB> (blocking temperature) was explained to superparamagnetic transition.
Melt-spinning법을 이용하여 제조된 비정질 리본의 Single Strip 방법을 이용한 자기적 특성 측정 연구
이재웅(Jae Woong Lee),이성우(Sung Woo Lee),정종율(Jong-Ryul Jeong),박수영(Soo Young Park),김향연(Hyang Yeon Kim) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.6
In this study, we have investigated the frequency and annealing temperature dependent magnetic properties of melt-spun Fe<SUB>64.5</SUB>Co₇Si₅B<SUB>15.5</SUB>Nb<SUB>3.5</SUB>Al<SUB>4.5</SUB> amorphous ribbon. We have measured B-H magnetic hysteresis loops in the frequency range of 50 ㎐~100 ㎑ using single-strip method and magnetic permeabilities in the frequency range of 1㎒~100 ㎒ using impedance analyzer. We observed the increase of coercivity as a function of measurement frequency and annealing temperature due to Eddy current effect and crystallization, respectively.
동씨침법(董氏鍼法)의 의의(意義)와 임상적(臨床的) 응용(應用)
박유리 ( Yu Ri Pack ),강백규 ( Byaech Gyu Kang ),김호겸 ( Ho Gyeom Kim ),변지환 ( Ji Hwan Byeon ),송정호 ( Jeong Ho Song ),정종율 ( Jong Ryul Jeong ),장진요 ( Jin Yo Jang ),황재호 ( Jae Ho Hwang ),조명수 ( Myeong Su Cho ),김경식 ( 대한경락경혈학회 2002 Korean Journal of Acupuncture Vol.19 No.2
In this paper, we studied Dongssi` acupuncture therapy via the consideration of development process of Oriental medicine in history. We investigated the distribution chart and naming of Dongssi` acupuncture point in human body, artificial selection principle of Dongssi` acupuncture point to therapy (選穴原則) on the various diseases, the therapy of pyo-bon (標本理論) and the therapy of Geun-Gyeal (根結理論) and compared GeoZa-principle (巨刺法) and MuZa-principle (繆刺法) with artificial selection principle of Dongssi` acupuncture point. And we also studied the acupuncture therapy of DongGi (動氣鍼法), DoMa (倒馬鍼法) and SaeIn (索引鍼法), which is the unique principle in Dongssi` acupuncture theraphy, to consider with the other Oriental medicine theory which is the theory of ZangSang (臟象學說) and BiWi (脾胃學說) etc. Our desire in this study is the giving aid to treatment diseases with the acupuncture therapy in Oriental medicine.