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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Optics and Photonics
Journal Basic Information
Journal DOI :
Optical Society of Korea
Editor in Chief :
Volume & Issues
Volume 24, Issue 6 - Dec 2013
Volume 24, Issue 5 - Oct 2013
Volume 24, Issue 4 - Aug 2013
Volume 24, Issue 3 - Jun 2013
Volume 24, Issue 2 - Apr 2013
Volume 24, Issue 1 - Feb 2013
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Polarization Selective Blazed Grating Employing Metal-slit Arrays
Jung, Young Jin ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 53~57
DOI : 10.3807/KJOP.2013.24.2.053
A polarization selective blazed grating employing metal-slit arrays was proposed. Nano-scale metal-slits were applied to the micro-scale blazed grating to give the functionality of polarization selection. Case study was carried out for the proposed structure utilizing numerical FDTD (Finite Difference Time Domain method) simulation. Diffraction efficiency of 77.61% and polarization extinction ratio of 8.99 was achieved with arbitrary parameters and diffraction efficiency of 64.22% and polarization extinction ratio of 81.09 was achieved with other parameters to enhance extinction ratio.
Theoretical Analysis of Impact of Q-switch Rise Time on Output Pulse Performance in an Ytterbium-doped Actively Q-switched Fiber Laser
Jeon, Jinwoo ; Lee, Junsu ; Lee, Ju Han ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 58~63
DOI : 10.3807/KJOP.2013.24.2.058
A theoretical analysis of the impact of rise time of a Q-switch on the output pulse performance is carried out in an Ytterbium-doped actively Q-switched fiber laser. The finite difference time domain (FDTD) method is used to numerically simulate the Q-switched fiber laser. It is shown that stable Gaussian-like pulse shape can be generated when the Q-switch rise time is increased and pulse repetition rate is enlarged.
Analysis of Luminous Characteristics of White LEDs Depending on Yellow Phosphors
Choi, Hyun-Woo ; Ko, Jae-Hyeon ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 64~70
DOI : 10.3807/KJOP.2013.24.2.064
In this paper, two white light emitting diodes(LEDs) were manufactured by using two kinds of yellow phosphor, YAG:Ce and
, and their spectroscopic properties were compared and analyzed. We found that the asymmetric double sigmoidal function can be applied to both white LEDs to obtain the center wavelength, the half width, and the skewness parameters. According to this analysis, the half width of the emitting spectrum of silicate phosphor was smaller than that of YAG phosphor, indicating smaller color rendering index. However, the silicate phosphor exhibited better color stability depending on the driving current than the YAG phosphor. The current dependence of the luminous efficacy of both white LEDs was investigated, which showed that efficacy decreased monotonically with current. The efficacy of the silicate-based white LED was lower than that of the YAG-based LED by about 10~12 lm/W.
Study on the Effective Focal Volume Change due to Light Intensity Using Fluorescence Correlation Spectroscopy
Jeong, Chanbae ; Lee, Jaeran ; Kim, Sok Won ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 71~76
DOI : 10.3807/KJOP.2013.24.2.071
Using fluorescence correlation spectroscopy, we analyzed the change of effective focal volume of a confocal system with light intensity. The fluorescence correlation spectroscopy system was home-built in accordance with the He-Ne laser with a wavelength of 632.8 nm, and two kinds of samples (AlexaFluor657 and Quantum dot655) suitable for the wavelength of the laser beam were used. For each sample, we analyzed and compared the correlation functions obtained while changing the intensity of the light source in a range of 1~50
. The result shows that the radius of the focal area increases linearly through the increase of particle number and diffusion time in response to an intensity change in weak light below 10
. In the higher intensity region (>10~15
), the increasing rate of particle number and diffusion time keep increasing but at a much slower rate. Through this result, it was also found that the radius increasing rate of the focal area was reduced however, the radius still increased slightly.
Precise Measurement of Ultra Small Retardation of Rubbed Polyimide Alignment Layer Using an Improved Transmission Ellipsometer
Lyum, Kyoung Hun ; Park, Sang Uk ; Yang, Seong Mo ; Yoon, Hee Kyu ; Kim, Sang Youl ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 77~85
DOI : 10.3807/KJOP.2013.24.2.077
The precision of retardation measurement has been improved upto
<0.005 nm after improvements are made to the conventional transmission ellipsometer. Improvements are made such that, i) the polarizer module instead of the sample stage is rotated, ii) the light source is replaced, iii) the starting points of two rotating modules are accurately synchronized, and iv) the fine background retardation is compensated. Together with the newly introduced RVD (Retardation Vector Difference) method, the improved instrument is successfully applied to characterize the ultra small optical birefringence of the rubbed polyimide alignment layer, after the residual retardation due to glass substrate whose magnitude is about 1.0 nm is properly subtracted. It is verified that the net retardation of the alignment layer ranges from 0.05 nm to 0.15 nm.
Near-field Evaluation of Surface Plasmon Resonance Biosensor Sensitivity Based on the Overlap Between Field and Target Distribution
Ryu, Yeonsoo ; Son, Taehwang ; Kim, Donghyun ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 86~91
DOI : 10.3807/KJOP.2013.24.2.086
In this study, we have investigated the correlation of far-field detection sensitivity of surface plasmon resonance (SPR) biosensors with optical signatures associated with the near-field overlap of biomolecules. The results confirm a direct relation between the far-field and near-field parameters, particularly for optical signatures defined in terms of lateral electric field components that are tangential to the interface and thus continuous across the interface. The overall correlation between near-field optical signatures and far-field resonance shift exceeded 97%. The results can be highly useful to evaluate detection sensitivity of SPR biosensors that take advantage of complex structures for localization of surface waves.
Expressions for Ellipsometric Constants of Samples Covered with Two Thick Incoherent Films
Kim, Sang Youl ;
Korean Journal of Optics and Photonics, volume 24, issue 2, 2013, Pages 92~98
DOI : 10.3807/KJOP.2013.24.2.092
The expressions for ellipsometric constants of a sample covered with two thick films are derived, where incoherent superposition of multiply reflected lights inside thick films is properly considered in the frame of the rotating analyzer ellipsometry. The derived expressions are successfully applied to the analysis of a silicon wafer with a thin silicon dioxide film on it, which is placed beneath a cover glass and an air gap.