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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 14, Issue 4 - Dec 2010
Volume 14, Issue 3 - Sep 2010
Volume 14, Issue 2 - Jun 2010
Volume 14, Issue 1 - Mar 2010
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Development of Nanostructured Plasmonic Substrates for Enhanced Optical Biosensing
Byun, Kyung-Min ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 65~76
DOI : 10.3807/JOSK.2010.14.2.065
Plasmonic-based biosensing technologies have been successfully commercialized and applied for monitoring various biomolecular interactions occurring at a sensor surface. In particular, the recent advances in nanofabrication methods and nanoparticle syntheses provide a new route to overcome the limitations of a conventional surface plasmon resonance biosensor, such as detection limit, sensitivity, selectivity, and throughput. In this paper, optical and physical properties of plasmonic nanostructures and their contributions to a realization of enhanced optical detection platforms are reviewed. Following vast surveys of the exploitation of metallic nanostructures supporting localized field enhancement, we will propose an outlook for future directions associated with a development of new types of plasmonic sensing substrates
Applications of Digital Holography in Biomedical Microscopy
Kim, Myung-K. ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 77~89
DOI : 10.3807/JOSK.2010.14.2.077
Digital holography (DH) is a potentially disruptive new technology for many areas of imaging science, especially in microscopy and metrology. DH offers a number of significant advantages such as the ability to acquire holograms rapidly, availability of complete amplitude and phase information of the optical field, and versatility of the interferometric and image processing techniques. This article provides a review of the digital holography, with an emphasis on its applications in biomedical microscopy. The quantitative phase microscopy by DH is described including some of the special techniques such as optical phase unwrapping and holography of total internal reflection. Tomographic imaging by digital interference holography (DIH) and related methods is described, as well as its applications in ophthalmic imaging and in biometry. Holographic manipulation and monitoring of cells and cellular components is another exciting new area of research. We discuss some of the current issues, trends, and potentials.
New Random and Additional Phase Adjustment of Joint Transform Correlator
Jeong, Man-Ho ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 90~96
DOI : 10.3807/JOSK.2010.14.2.090
Joint transform correlator (JTC) has been the most suitable technique for real time pattern recognition. This paper proposes a new phase adjustment which adopts two steps of random phase adjustment in the spatial domain and additional phase adjustment in the Fourier domain. Simulated results are presented to show the optimum condition of the phase adjustment and the effect on the correlation peaks, the peak signal-to-noise ratio and the level of discrimination.
QPSK Modulation Based Optical Image Cryptosystem Using Phase-shifting Digital Holography
Jeon, Seok-Hee ; Gil, Sang-Keun ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 97~103
DOI : 10.3807/JOSK.2010.14.2.097
We propose a new technique for the optical encryption of gray-level optical images digitized into 8-bits binary data by ASCII encoding followed by QPSK modulation. We made an encrypted digital hologram with a security key by using 2-step phase-shifting digital holography, and the encrypted digital hologram is recorded on a CCD camera with 256 gray-level quantized intensities. With these encrypted digital holograms, the phase values are reconstructed by the same security key and are decrypted into the original gray-level optical image by demodulation and decoding. Simulation results show that the proposed method can be used for cryptosystems and security systems.
Extraction of a Distance Parameter in Optical Scanning Holography Using Axis Transformation
Kim, Tae-Geun ; Kim, You-Seok ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 104~108
DOI : 10.3807/JOSK.2010.14.2.104
We proposed an axis transformation technique which reveals a distance parameter directly from optical scanning holography (OSH). After synthesis of a real-only spectrum hologram and power fringe adjusted filtering, we transform an original frequency axis to a new frequency axis using interpolation. In the new frequency axis, the filtered hologram has a single frequency which is linearly proportional to the distance parameter. Thus, the inverse Fourier transformation of the filtered hologram gives a delta function pair in the new spatial axis. Finally, we extract the distance parameter by detecting the location of the delta function pair.
Panoramic Image Composed of Multiple Rectilinear Images Generated from a Single Fisheye Image
Kweon, Gyeong-Il ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 109~120
DOI : 10.3807/JOSK.2010.14.2.109
We have developed mathematically precise image-processing algorithms for extracting rectilinear images from fisheye images as well as digital pan/tilt/zoom technology. Using this technology, vertical lines always appear as vertical lines in the panned and/or tilted images. Furthermore, polygonal panoramic images composed of multiple rectilinear images have been obtained using the developed digital pan/tilt technology.
Analysis of Image Visibility in Projection-type Integral Imaging System without Diffuser
Park, Soon-Gi ; Song, Byoung-Sub ; Min, Sung-Wook ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 121~126
DOI : 10.3807/JOSK.2010.14.2.121
We analyze image visibility of a projection-type integral imaging system without diffuser, in terms of the fill factor, which is determined by the relationship between the exit pupil of the projection system and the size and the focal length of the elemental lens. High fill factor is a requirement for good visibility. Moreover, for psychological reasons, for the same fill factor, better visibility is accomplished using a relatively small elemental lens. In this paper, we study image visibility through basic experiments and results.
Development and Evaluation of an Electron Beam Source for Microscopy and Its Applications
Ahn, Seung-Joon ; Oh, Tae-Sik ; Kim, Ho-Seob ; Ahn, Seong-Joon ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 127~130
DOI : 10.3807/JOSK.2010.14.2.127
We have developed an efficient electron beam (e-beam) source, a microcolumn, that can be used as a source module for of microscopy and its applications. To obtain a low operating voltage, a very sharp cold field electron emitter was developed by electrochemically etching a tungsten wire. Laser diffraction was used for the fabrication of high-quality electron lenses and for their precise alignment. The measurement of the e-beam currents, and SEM images captured by the microcolumn confirmed the potential of the device as a very good e-beam source.
Noise-robust Phase Gradient Retrieval Formulation for Phase-shifting Interferometry
Park, Dae-Seo ; O, Beom-Hoan ; Park, Se-Geun ; Lee, El-Hang ; Park, Jae-Hyun ; Lee, Seung-Gol ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 131~136
DOI : 10.3807/JOSK.2010.14.2.131
Modification of the phase gradient formulation is proposed in order to make phase retrieval less susceptible to noise. The modified formulation is derived from separation of the phase terms and the intensity modulation terms of interferograms, and subsequent differentiation to reduce the noise-induced error of the phase gradient vector. Its performance is evaluated and compared to that of the conventional formulation, and noise-robust nature is confirmed.
All-optical Flip-flop Operation Based on Polarization Bistability of Conventional-type 1.55-㎛ Wavelength Single-mode VCSELs
Lee, Seoung-Hun ; Jung, Hae-Won ; Kim, Kyong-Hon ; Lee, Min-Hee ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 137~141
DOI : 10.3807/JOSK.2010.14.2.137
We report, for the first time to our knowledge, observation of polarization bistability from 1.55-
wavelength single-mode VCSELs of a conventional cylinder-shape under control of their driving current, and demonstration of all-optical flip-flop (AOFF) operations based on the bistability with optical set and reset pulse injection at a 50 MHz switching frequency. The injection pulse energy was less than 14 fJ. The average on-off contrast ratio of the flip-flopped signals was about 7 dB. These properties of the VCSELs will be potentially useful for future high-speed all-optical signal processing applications.
Simulation of Energy Conversion Efficiency of a Solar Cell with Gratings
Kim, Sung-Chul ; Sohn, In-Soo ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 142~145
DOI : 10.3807/JOSK.2010.14.2.142
In this work, a numerical analysis of a CIGS (
) solar cell with a rectangular grating on the electrode is presented. The effects of the grating on the energy conversion efficiency are calculated using the RCWA (rigorous coupled wave analysis) method. In conventional CIGS solar cells, the thickness of the light absorption layer (CIGS) is
, at which the incident light is almost absorbed. By adopting a grating on the electrode and using a less than
CIGS layer, we obtained a higher efficiency compared to the conventional solar cells.
Real-time Temporal Characterization and Performance Optimization of a kHz Femtosecond Ti:Sapphire Laser Using a Comprehensive SPIDER
Luu, Tran Trung ; Park, Ju-Yun ; Lee, Jae-Hwan ; Nam, Chang-Hee ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 146~151
DOI : 10.3807/JOSK.2010.14.2.146
A comprehensive real-time spectral phase interferometry for direct electric field reconstruction (SPIDER) apparatus for characterizing femtosecond laser pulses is demonstrated. The SPIDER provides the temporal profiles of femtosecond laser pulses, reconstructed at the speed of 3.5 Hz, with parameters of the spectral phase such as group delay dispersion and third-order dispersion. The apparatus is applied successfully to optimize the spectral dispersion of a kHz femtosecond Ti:Sapphire laser by adjusting a grating compressor in real time.
Spatial Luminance Contrast Sensitivity: Effects of Surround
Kim, Youn-Jin ; Kim, Hong-Suk ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 152~162
DOI : 10.3807/JOSK.2010.14.2.152
This study examined the effects of surround luminance on the shape of the spatial luminance contrast sensitivity function (CSF). The reduction in brightness of uniform neutral patches shown on a computer controlled display screen is also assessed to explain the change of CSF shape. Consequently, a large amount of reduction in contrast sensitivity at middle spatial frequencies can be observed; however, the reduction is relatively small for low spatial frequencies. In general, the effect of surround luminance on the CSF appears similar to that of mean luminance. Reduced CSF responses result in less power of the filtered image; therefore, the stimulus should appear dimmer with a higher surround luminance.
Wafer-level Fabrication of Ball Lens by Cross-cut and Reflow of Wafer-bonded Glass on Silicon
Lee, Dong-Whan ; Oh, Jin-Kyung ; Choi, Jun-Seok ; Lee, Hyung-Jong ; Chung, Woo-Nam ;
Journal of the Optical Society of Korea, volume 14, issue 2, 2010, Pages 163~169
DOI : 10.3807/JOSK.2010.14.2.163
Novel wafer-level fabrication of a glass ball-lens is realized for optoelectronic applications. A Pyrex wafer is bonded to a silicon wafer and cross-cut into a square-tile pattern, followed by wet-etching of the underlying silicon. Cubes of Pyrex on the undercut silicon are then turned into ball shapes by thermal reflow, and separated from the wafer by further etching of the silicon support. Radial variation and surface roughness are measured to be less than
, respectively, for ball diameter of about
. A surface defect on the ball that is due to the silicon support is shown to be healed by using a silicon-optical-bench. Optical power-relay of the ball lens showed the maximum efficiency of 65% between two single-mode fibers on the silicon-optical-bench.