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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Optical Society of Korea
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Journal DOI :
Optical Society of Korea
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Volume & Issues
Volume 17, Issue 6 - Dec 2013
Volume 17, Issue 5 - Oct 2013
Volume 17, Issue 4 - Aug 2013
Volume 17, Issue 3 - Jun 2013
Volume 17, Issue 2 - Apr 2013
Volume 17, Issue 1 - Feb 2013
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Thermo-optic Characteristics of Micro-structured Optical Fiber Infiltrated with Mixture Liquids
Wang, Ran ; Wang, Yuye ; Miao, Yinping ; Lu, Ying ; Luan, Nannan ; Hao, Congjing ; Duan, Liangcheng ; Yuan, Cai ; Yao, Jianquan ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 231~236
DOI : 10.3807/JOSK.2013.17.3.231
We present both theoretically and experimentally the thermo-optic characteristics of micro-structured optical fiber (MOF) filled with mixed liquid. The performance of MOF depends on the efficient interaction between the fundamental mode of the transmitted light wave and the tunable thermo-optic materials in the cladding. The numerical simulation indicates that the confinement loss of MOF presents higher temperature dependence with higher air-filling ratios
, longer incident wavelength and fewer air holes in the cladding. For the 4cm liquid-filled grapefruit MOF, we demonstrate from experiments that different proportions of solutions lead to tunable temperature sensitive ranges. The insertion loss and the extinction ratio are 3~4 dB and approximate 20 dB, respectively. The proposed liquid-filling MOF will be developed as thermo-optic sensor, attenuator or optical switch with the advantages of simple structure, compact configuration and easy fabrication.
Fuzzy Adaptive Modified PSO-Algorithm Assisted to Design of Photonic Crystal Fiber Raman Amplifier
Akhlaghi, Majid ; Emami, Farzin ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 237~241
DOI : 10.3807/JOSK.2013.17.3.237
This paper presents an efficient evolutionary method to optimize the gain ripple of multi-pumps photonic crystal fiber Raman amplifier using the Fuzzy Adaptive Modified PSO (FAMPSO) algorithm. The original PSO has difficulties in premature convergence, performance and the diversity loss in optimization as well as appropriate tuning of its parameters. The feasibility and effectiveness of the proposed hybrid algorithm is demonstrated and results are compared with the PSO algorithm. It is shown that FAMPSO has a high quality solution, superior convergence characteristics and shorter computation time.
Full Color Holographic Optical Element Fabrication for Waveguide-type Head Mounted Display Using Photopolymer
Piao, Jing-Ai ; Li, Gang ; Piao, Mei-Lan ; Kim, Nam ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 242~248
DOI : 10.3807/JOSK.2013.17.3.242
Full color holographic optical element fabrication using a photopolymer is proposed for a waveguide-type head mounted display. The fabricated full color holographic optical elements can be attached to the waveguide to replace the conventional couple-in and couple-out optics in the head mounted display. To implement the system, this study analyzed the optical characteristics of the photopolymer using three lasers (red, green and blue). Considering the color uniformity, a new laminated structure for a full color holographic optical element was also designed. The proposed system was confirmed experimentally.
Development of a Smartphone-based Pupillometer
Kim, Tae-Hoon ; Youn, Jong-In ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 249~254
DOI : 10.3807/JOSK.2013.17.3.249
In ophthalmology, a pupillometer, a device to measure the diameter of the pupil of the eye, can provide information on the function of the autonomic nervous system. The current pupillometers on the market are either too large to be a handheld instrument, or relatively expensive. In this study, a pupillometer based on a smartphone was designed. Both white and infrared LEDs and a 3M pixel camera of a smartphone were applied for the visual stimuli to an eye and for the acquisition of the eye images, respectively. Contrary to the existing method of pupil measurement that usually observe the variation of pupil diameter, the proposed algorithm in this study was applied to calculate the constriction ratio of the pupillary area in response to pupillary light reflex. The results showed that the constriction ratio of the pupillary area were all in the normal range (above 4.0) from the sixteen healthy participants. It is believed that the approach to pupil measurement used in this study is suitable for a mobile interface, and this system can be applied to clinical research, home-use healthcare, and distributed to some areas which suffer from problems like a lack of medical support.
Scene-based Nonuniformity Correction Algorithm Based on Temporal Median Filter
Geng, Lixiang ; Chen, Qian ; Qian, Weixian ; Zhang, Yuzhen ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 255~261
DOI : 10.3807/JOSK.2013.17.3.255
Scene-based nonuniformity correction techniques for infrared focal-plane arrays have been widely considered as a key technology, and various algorithms have been proposed to compensate for fixed-pattern noise. However, the existed algorithms' capability is always restricted by the problems of convergence speed and ghosting artifacts. In this paper, an effective scene-based nonuniformity correction method is proposed to solve these problems. The algorithm is an improvement over the constant statistics method and a temporal median is utilized with the Gaussian kernel to estimate the nonuniformity parameters. Also theoretical analysis is conducted to demonstrate that effective ghosting artifacts elimination and superior convergence speed can be obtained with the proposed method. Finally, the performance of the proposed technique is tested with infrared image sequences with simulated nonuniformity and with infrared imagery with real nonuniformity. The results show the proposed method is able to estimate each detector's gain and to offset reliably and that it performs better in increasing convergence speed and reducing ghosting artifacts compared with the conventional techniques.
Near-infrared Subwavelength Imaging and Focusing Analysis of a Square Lattice Photonic Crystal Made from Partitioned Cylinders
Dastjerdi, Somayeh Rafiee ; Ghanaatshoar, Majid ; Hattori, Toshiaki ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 262~268
DOI : 10.3807/JOSK.2013.17.3.262
We study the focusing properties of a two-dimensional square-lattice photonic crystal (PC) comprising silica and germanium partitioned cylinders in air background. The finite difference time domain (FDTD) method with periodic boundary condition is utilized to calculate the dispersion band diagram and the FDTD method incorporating the perfectly matched layer boundary condition is employed to simulate the image formation. In contrast to the common square PCs in which the negative refraction effect occurs in the first photonic band without negative phase propagation, in our suggested model system, the frequency with negative refraction exists in the second band and in near-infrared region. In this case, the wave propagates with a negative phase velocity and the evanescent waves can be supported. We also discuss the dependency of the image resolution and its location on surface termination, source location, and slab thickness. According to the simulation results, spatial resolution of the proposed PC lens is below the radiation wavelength.
Optical Simulation Study on the Effect of Diffusing Substrate and Pillow Lenses on the Outcoupling Efficiency of Organic Light Emitting Diodes
Jeong, Su Seong ; Ko, Jae-Hyeon ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 269~274
DOI : 10.3807/JOSK.2013.17.3.269
The effect of diffusing substrate and pillow lenses on the outcoupling efficiency of organic light-emitting diodes (OLEDs) was studied by optical simulation based on the point-dipole model. The diffusing substrate included Mie scatterers by which the condition of total internal reflection could be broken. The finite-difference time-domain method was used to obtain the intensity distribution on the transparent electrode of an OLED, which was used as a light source to carry out a ray-tracing simulation of the OLED and the diffusing substrate. It was found that the outcoupling efficiency of the OLED was sensitive to the thickness of organic layers and could be increased by 21.0% by adopting a diffusing substrate in which Mie scatterers whose radius was
were included at the density of
and by 65.5% by forming one pillow lens with the radius of 2 mm on the front surface of the glass substrate. This study revealed that the outcoupling efficiency could be improved by adopting diffusing substrate and pillow lenses along with the optimization of the thickness of each layer in the OLED.
Effect of Wavelength-dependent Scattering on the Color Chromaticity of the LCD Backlight
Kwon, Jin Hyuk ; Jun, Hwa Joon ; Gwag, Jin Seog ; Lee, Hong Su ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 275~278
DOI : 10.3807/JOSK.2013.17.3.275
The effect of the wavelength-dependent scattering on the change of the color chromaticity in the lightguide panel of a liquid crystal display is examined. The white light emitted from the white LEDs located at the edge of the lightguide propagates in the lightguide and is scattered by the patterned dots that are placed on the bottom of the lightguide. The scattered lights that are far from the LEDs showed reddish color compared to the bluish color that is scattered from the near area from the LEDs. The color difference was between 0.01 to 0.06 depending on the resin and the thickness of the lightguide.
Analytical Study of Polarization Spectroscopy for the J
=0 → J
Noh, Heung-Ryoul ;
Journal of the Optical Society of Korea, volume 17, issue 3, 2013, Pages 279~282
DOI : 10.3807/JOSK.2013.17.3.279
This work presents a theoretical study on the analytical calculation of the lineshape of polarization spectroscopy (PS) for the transition line
. From the obtained analytical form of the PS spectrum, we were able to identify how the saturation affected the lineshape of the PS spectrum. The results obtained will be useful for polarization spectroscopy experiments using the alkaline-earth atoms such as Sr or Yb.