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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 16, Issue 4 - Dec 2012
Volume 16, Issue 3 - Sep 2012
Volume 16, Issue 2 - Jun 2012
Volume 16, Issue 1 - Mar 2012
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The Variation of Radiation Transmittance by the cw 1.07 ㎛ Fiber Laser and Water Aerosol Interaction
Koh, Hae Seog ; Shin, Wan Soon ; Jeon, Min Yong ; Park, Byung Suh ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 191~195
DOI : 10.3807/JOSK.2012.16.3.191
Among the atmospheric effect of laser propagation, the variations of the radiation transmittance by water aerosol evaporation have quantitatively been investigated. When the aerosol was exposed by a 1.07
cw fiber laser, the increased amount of the transmittance variation was a maximum of 19.1% and the volume concentration variation of aerosol was observed as an increasing of laser intensity. Also, significant irregularity of refractive index was not found in the heated area during the continuous laser heating.
Investigation of the Convergence Behavior with Fluctuation Features in the Fourier Modal Analysis of a Metallic Grating
Kim, Hwi ; Park, Gwanwoo ; Kim, Changsoon ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 196~202
DOI : 10.3807/JOSK.2012.16.3.196
We observe that the transmission and reflection efficiencies of a one-dimensional metallic grating under transverse-magnetic illumination calculated using the Fourier modal method (FMM) with the Fourier factorization rules have peculiar fluctuations, albeit small in magnitude, as the number of field harmonics increases. It is shown that when the number of Fourier terms for the electromagnetic field is increased from that in the conventional FMM, the fluctuations due to non-convergent highly evanescent eigenmodes can be eliminated. Our examination reveals that the fluctuations originate from the Gibbs phenomenon inherent in the Fourier-series representation of a permittivity function with discontinuities, and from non-convergence of highly evanescent internal Bloch eigenmodes.
New Type of White-light LED Lighting for Illumination and Optical Wireless Communication under Obstacles
Choi, Su-il ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 203~209
DOI : 10.3807/JOSK.2012.16.3.203
Visible light communications (VLC) use modern solid-state light-emitting diodes (LEDs) to broadcast information. Emerging white-light LEDs allow the combination of lighting and optical wireless communication in one optical source. In this paper, a new LED lighting design using one-chip-type white LEDs is proposed for efficient illumination and optical wireless communications under the existence of several obstacles. Lighting and communication performance are analyzed to show the effectiveness of the proposed LED lighting. Specifically, the signal-to-noise ratio considering intersymbol interference and the bit-error rate of variable pulse position modulation (VPPM) with dimming control are considered.
Measurement Range Enlargement in Brillouin Optical Correlation Domain Analysis Using Multiple Correlation Peaks
Jeong, Ji Ho ; Lee, Kwanil ; Jeong, Je-Myung ; Lee, Sang Bae ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 210~214
DOI : 10.3807/JOSK.2012.16.3.210
We propose and experimentally demonstrate a method for extension of measurement range in a Brillouin optical correlation domain analysis sensor system without resolution deterioration. In the experiment, a 300 m measurement range with about 8 cm spatial resolution was successfully obtained by cascading three different kinds of fibers as a sensing element.
Experimental Demonstration and Analytic Derivation of Chromatic Dispersion Monitoring Technique Based on Clock-frequency Component
Kim, Sung-Man ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 215~220
DOI : 10.3807/JOSK.2012.16.3.215
In an earlier work, we proposed the chromatic dispersion monitoring technique of non-return to zero (NRZ) signal based on clock-frequency component (CFC) through numerical simulations. However, we have not yet shown any experimental demonstration or analytic derivation of it. In this paper, we show an experimental demonstration and analytic derivation of the proposed chromatic dispersion monitoring technique. We confirm that the experimental results and the analytic results correspond with the simulation results. We also demonstrate that monitoring range and accuracy can be improved by using a simple clock-extraction method.
Optical Proximity Corrections for Digital Micromirror Device-based Maskless Lithography
Hur, Jungyu ; Seo, Manseung ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 221~227
DOI : 10.3807/JOSK.2012.16.3.221
We propose optical proximity corrections (OPCs) for digital micromirror device (DMD)-based maskless lithography. A pattern writing scheme is analyzed and a theoretical model for obtaining the dose distribution profile and resulting structure is derived. By using simulation based on this model we were able to reduce the edge placement error (EPE) between the design width and the critical dimension (CD) of a fabricated photoresist, which enables improvement of the CD. Moreover, by experiments carried out with the parameter derived from the writing scheme, we minimized the corner-rounding effect by controlling light transmission to the corners of a feature by modulating a DMD.
Wavefront Sensitivity Analysis Using Global Wavefront Aberration in an Unobscured Optical System
Joo, Won Don ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 228~235
DOI : 10.3807/JOSK.2012.16.3.228
It is very important to analyze effectively the tolerance of an optical system with high resolution as the projection lens of photolithography or as the objective lens of a microscope. We would like to find an effective assembly structure and compensators to correct aberrations through global wavefront sensitivity analysis using Zernike polynomial expansion from the field and pupil coordinates rather than from only pupil coordinates. In this paper, we introduce global wavefront coefficients by small perturbations of the optical system, and analyze the optical performance with these coefficients. From this analysis, it is possible to see how we can enlarge the tolerance through the proper assembly structure and compensators.
A Study of Optical Properties of Intraocular Lenses and of Measurement of the Index of Reflection for an Unknown Liquid
Joo, Won Don ; Jung, Mee Suk ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 236~242
DOI : 10.3807/JOSK.2012.16.3.236
In general, such methods as interferometers or wavefront sensors are commonly used for testing of an optical system and optical components. In these cases, the surrounding environments are unlikely to affect the measurements. On the other hand, intraocular lenses of hydrophilic materials with special properties experience a certain difficulty in testing the optical properties. An intraocular lens is dried in the air, which causes deformation and changes the optical characteristics such as index of refraction and thickness. Thus, it is hard to measure the optical characteristics of an intraocular lens by using common methods. In this study, a special structure is used for measuring of the transmission wavefront aberration and effective focal length of an intraocular lens of hydrophilic materials by using a Shark-Hartmann sensor among the various measuring methods. As an application of this measuring method, this study shows a simple method to measure the index of refraction of unknown liquids with a plano-convex lens with a well known index of refraction. Also, this method is used to measure the optical properties of a plano-convex such as index of refraction and curvature by using a liquid with a well known index of refraction.
An Optical Design of Off-axis Four-mirror-anastigmatic Telescope for Remote Sensing
Li, Xing Long ; Xu, Min ; Ren, Xian Dong ; Pei, Yun Tian ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 243~246
DOI : 10.3807/JOSK.2012.16.3.243
An off-axis four-mirror-anastigmatic telescope is presented here which is composed of two aspheric surfaces and two spherical surfaces. The entrance pupil diameter is 290 mm and the stop is located at the primary mirror. The effective focal length is 900 mm. The strip field of view for the telescope is
and if the telescope is launched into an orbit about 400 km altitude, the observed range width will be more than 105 km within a scene without any other auxiliary scanning instrument. The spectral range can be as wide as from visual wave band to infrared wave band in the mirror system. This telescope can be used for environmental monitoring with different detectors whose pixel is adapted to the optical resolution. In this paper, the spectral range is chosen as 3.0 -5.0
, and center distance of the pixel is 30
. And the image quality is near the diffraction limit.
Development of Optical Fiber-based Daylighting System with Uniform Illumination
Ullah, Irfan ; Shin, Seoyong ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 247~255
DOI : 10.3807/JOSK.2012.16.3.247
Daylighting has a very effective role in reducing power consumption and improving indoor environments in office buildings. Previously, it was not under consideration as a major source of renewable energy due to poor reliability in the design. Optical fiber as a transmission medium in the daylighting system demands uniform distribution of light to solve cost, heat, and efficiency issues. Therefore, this study focuses on the uniform distribution of sunlight through the fiber bundle and to the interior of the building. To this end, two efficient approaches for the fiber-based daylighting system are presented. The first approach consists of a parabolic mirror, and the second approach contains a Fresnel lens. Sunlight is captured, guided, and distributed through the concentrator, optical fibers, and lenses, respectively. At the capturing stage, uniform illumination solves the heat problem, which has critical importance in making the system cost-effective by introducing plastic optical fibers. The efficiency of the system is increased by collimated light, which helps to insert maximum light into the optical fibers. Furthermore, we find that the hybrid system of combining sunlight and light emitting diode light gives better illumination levels than that of traditional lighting systems. Simulation and experimental results have shown that the efficiency of the system is better than previous fiber-based daylighting systems.
Analysis of Effect of Phase Error Sources of Polarization Components in Incoherent Triangular Holography
Kim, Soo-Gil ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 256~262
DOI : 10.3807/JOSK.2012.16.3.256
We derive the point-spread function of the reconstructed image from a point-source complex hologram, which includes phase error caused by polarization components, in the longitudinal direction of the point-spread function and analyze the effect of the error sources of polarization components having influence on image reconstruction of a point-source complex hologram in incoherent triangular holography.
Dual Optical Encryption for Binary Data and Secret Key Using Phase-shifting Digital Holography
Jeon, Seok Hee ; Gil, Sang Keun ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 263~269
DOI : 10.3807/JOSK.2012.16.3.263
In this paper, we propose a new dual optical encryption method for binary data and secret key based on 2-step phase-shifting digital holography for a cryptographic system. Schematically, the proposed optical setup contains two Mach-Zehnder type interferometers. The inner interferometer is used for encrypting the secret key with the common key, while the outer interferometer is used for encrypting the binary data with the same secret key. 2-step phase-shifting digital holograms, which result in the encrypted data, are acquired by moving the PZT mirror with phase step of 0 or
in the reference beam path of the Mach-Zehnder type interferometer. The digital hologram with the encrypted information is a Fourier transform hologram and is recorded on CCD with 256 gray level quantized intensities. Computer experiments show the results to be encryption and decryption carried out with the proposed method. The decryption of binary secret key image and data image is performed successfully.
Analysis of Off-axis Integral Floating System Using Concave Mirror
Kim, Young Min ; Jung, Kwang-Mo ; Min, Sung-Wook ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 270~276
DOI : 10.3807/JOSK.2012.16.3.270
An off-axis integral floating system using a concave mirror is analyzed to resolve the image distortion incurred by the off-axis optical arrangement. The concave mirror can be adopted as the floating device to improve the optical efficiency. The image distortion due to the tilting axis of the concave mirror needs to be analyzed precisely to generate the pre-distortion image. In this paper, we calculate the image deformation in the off-axis structure of the concave mirror using the geometrical optics. Using the calculation results, the compensated elemental image can be generated for the pre-distortion integrated image, which can be projected to the floating 3D image without image distortion. The basic experiments of the off-axis integral floating are presented to prove and verify the proposal.
Weak Value Measurement of an Optical Beam Deflection in Image Rotating Sagnac Interferometer
Park, Sang-Joon ; Kim, Hyoung Joo ; Noh, Jaewoo ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 277~281
DOI : 10.3807/JOSK.2012.16.3.277
We measured small optical beam deflection in an image rotating Sagnac interferometer. We used a weak value measurement scheme that involves a pre-selection, weak perturbation, and a post-selection procedure to obtain the amplified value of beam deflection. The amplification factor of the measured beam deflection varied from 11 to 63 depending on the settings of the post-selection polarizer in front of the photodetector and the settings of polarization compensator in the interferometer.
Compact and Temperature Independent Electro-optic Switch Based on Slotted Silicon Photonic Crystal Directional Coupler
Aghababaeian, Hassan ; Vadjed-Samiei, Mohammad-Hashem ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 282~287
DOI : 10.3807/JOSK.2012.16.3.282
In this paper, we have proposed a principle to design a compact and temperature independent electro-optic switch based on a slotted photonic crystal directional coupler (SPCDC). Infiltration of the slotted silicon photonic crystal with polymer enhances the slow light and decreases the switching length, whereas the different signs of thermo-optic coefficients of the polymer and silicon make the proposed switch stable within
temperature range. The SPCDC structure is modified to increase poling efficiency of the polymer in the slot and to flatten the dispersion diagram of the even mode to minimize the switching length.
Design of Ultra-wide Band-pass Filter Based on Metamaterials Applicable to Microwave Photonics
Lee, Chongmin ; Shim, Wooseok ; Moon, Yong ; Seo, Chulhun ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 288~291
DOI : 10.3807/JOSK.2012.16.3.288
We designed an ultra-wide band-pass filter applicable to microwave reflectometry for KSTAR (Korea Superconducting Tokamak Advanced Research) and to microwave photonics. The proposed ultra-wide band-pass filter exhibits a metamaterial structure characterized by a wide band, low insertion loss, and high skirt selectivity. The proposed filter is applied to enhance the linearity of reflectometry at the output of a VCO (voltage controlled oscillator). The pass-band of the proposed filter is observed at 18~28 GHz, and the out-of-band rejection is below 20 dB. Further, we constructed an unwrapped negative phase of S(2, 1) to verify the characteristics of the metamaterial. The under- and upper-band at lower limits of the pass-band are left- and right-handed, respectively. The group delay of the filter is less than 0.5 ns.
Epitaxial Structure Optimization for High Brightness InGaN Light Emitting Diodes by Using a Self-consistent Finite Element Method
Kim, Kyung-Soo ; Yi, Jong Chang ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 292~298
DOI : 10.3807/JOSK.2012.16.3.292
The epitaxial layer structures for blue InGaN light emitting diodes have been optimized for high brightness applications with the output power levels exceeding 1000
by using a self-consistent finite element method. The light-current-voltage relationship has been directly estimated from the multiband Hamiltonian for wurtzite crystals. To analyze the efficiency droop at high injection levels, the major nonradiative recombination processes and carrier spillover have also been taken into account. The wall-plug efficiency at high injection levels up to several thousand
has been successfully evaluated for various epilayer structures facilitating optimization of the epitaxial structures for desired output power levels.
Highly Angle-tolerant Spectral Filter Based on an Etalon Resonator Incorporating a High Index Cavity
Noh, Tae-Hui ; Yoon, Yeo-Taek ; Lee, Sang-Shin ; Choi, Duk-Yong ; Lim, Seung-Chan ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 299~304
DOI : 10.3807/JOSK.2012.16.3.299
A high angular tolerance spectral filter was realized incorporating an etalon, which consists of a
cavity sandwiched between a pair of Ag/Ge mirrors. The effective angle was substantially extended thanks to the cavity's high refractive index. The device was created by embedding a 313-nm thick
film in 16-nm thick Ag/Ge films through sputtering, with the Ge layer alleviating the roughness and adhesion of the Ag layer. For normal incidence, the observed center wavelength and transmission were ~900 nm and ~60%, respectively; throughout the range of
, the relative wavelength shift and transmission variation amounted to only ~0.06 and ~4%, respectively.
Active Focusing of Light in Plasmonic Lens via Kerr Effect
Nasari, Hadiseh ; Abrishamian, Mohammad Sadegh ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 305~312
DOI : 10.3807/JOSK.2012.16.3.305
We numerically demonstrate the performance of a plasmonic lens composed of an array of nanoslits perforated on thin metallic film with slanted cuts on the output surface. Embedding Kerr nonlinear material in nanoslits is employed to modulate the output beam. A two dimensional nonlinear-dispersive finite-difference time-domain (2D N-D-FDTD) method is utilized. The performance parameters of the proposed lens such as focal length, full-width half-maximum, depth of focus and the efficiency of focusing are investigated. The structure is illuminated by a TM-polarized plane wave and a Gaussian beam. The effect of the beam waist of the Gaussian beam and the incident light intensity on the focusing effect is explored. An exact formula is proposed to derive electric field E from electric flux density D in a Kerr-Dispersive medium. Surface plasmon (SPs) modes and Fabry-Perot (F-P) resonances are used to explain the physical origin of the light focusing phenomenon. Focused ion beam milling can be implemented to fabricate the proposed lens. It can find valuable potential applications in integrated optics and for tuning purposes.
Evaluation of 1.3-㎛ Wavelength VCSELs Grown by Metal Organic Chemical Vapor Deposition for 10 Gb/s Fiber Transmission
Park, Chanwook ; Lee, Seoung Hun ; Jung, Hae Won ; An, Shinmo ; Lee, El-Hang ; Yoo, Byueng-Su ; Roh, Jay ; Kim, Kyong Hon ;
Journal of the Optical Society of Korea, volume 16, issue 3, 2012, Pages 313~317
DOI : 10.3807/JOSK.2012.16.3.313
We have evaluated a 1.3
vertical-cavity surface-emitting laser (VCSEL), whose bottom mirror and central active layer were grown by metal organic chemical vapor deposition (MOCVD) and whose top mirror was covered with a dielectric coating, for 10 Gb/s data transmission over single-mode fibers (SMFs). Successful demonstration of error-free transmission of the directly modulated VCSEL signals at data rate of 10 Gb/s over a 10 km-long SMF was achieved for operating temperatures from
up to bit-error-rate (BER) of
. The DC bias current and modulation currents are only 7 mA and 6 mA, respectively. The results indicate that the VCSEL is a good low-power consuming optical signal source for 10 GBASE Ethernet applications under controlled environments.