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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 6, Issue 4 - Dec 2002
Volume 6, Issue 3 - Sep 2002
Volume 6, Issue 2 - Jun 2002
Volume 6, Issue 1 - Mar 2002
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Low-threshold Photonic Crystal Lasers from InGaAsP Free-standing Slab Structures
Ryu, Han-Youl ; Kim, Se-Heom ; Kwon, Soon-Hong ; Park, Hong-Gyu ; Lee, Yong-Hee ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 59~71
DOI : 10.3807/JOSK.2002.6.3.059
Photonic band gap structures have a high potential for nearly zero-threshold lasers. This paper describes new-types of low-threshold photonic crystal lasers fabricated in InGaAsP slab waveguides free-standing in air. Two-types of photonic crystal lasers are studied. One is a single-cell nano-cavity laser formed in a square array of air holes. This photonic band gap laser operates in the smallest possible whispering gallery mode with a theoretical Q >30000 and exhibits low threshold pump power of 0.8 mW at room temperature. The nther laser does not have any cavity structure and the lasing operation originates from the enhanced optical density of states near photonic band edges. A very low threshold of 35
W (incident pump power) is achieved from this laser at 80 K, one of the lowest values ever reported. This low threshold is benefited from low optical losses as well as enhanced material gain at low temperature.
A Dielectric Omnidirectional Near-infrared Reflector
Jeon, Heon-Su ; Park, Yeon-Sang ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 72~75
DOI : 10.3807/JOSK.2002.6.3.072
We have studied both theoretically and experimentally an omnidirectional reflector operating at the wavelength region of 1.3
m. The omnnidirectional reflector, a special case of one-dimensional photonic crystals, was prepared by alternately sputtering two dielectric materials, amorphous silicon and silicon dioxide. Measured reflectance spectra, very consistent with simulated results at all angles and polarizations, clearly showed the existence of an omnidirectional photonic bandgap.
Photonic Band Gaps for Surface Plasmon Modes in Dielectric Gratings on a Flat Metal Surface
Song, Seok-Ho ; Yoon, Jae-Woong ; Lee, Gwan-Su ; Oh, Cha-Hwan ; Kim, Pill-Soo ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 76~82
DOI : 10.3807/JOSK.2002.6.3.076
For dielectric gratings on a flat metal surface, photonic band gaps created by Brags scattering of surface plasmon polaritons are observed. The observation result that directly images this gap is compared with that predicted by a numerical model based on a plane wave expansion. Consistency between the experimental and numerical results is also confirmed by comparison with the well-known calculation method of diffraction, the rigorous coupled wave analysis method.
Surface Plasmon Nanooptics in Plasmonic Band Gap Structures: Interference of Polarization Controlled Surface Waves in the Near Field
Kim, D. S. ; Yoon, Y. C. ; Hohng, S. C. ; Malyarchuk, V. ; Lienau, Ch. ; Park, J. W. ; Kim, J. H. ; Park, Q. H. ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 83~86
DOI : 10.3807/JOSK.2002.6.3.083
Nanoscopic emission from periodic nano-hole arrays in thick metal films is studied experimentally. The experiments give direct evidence for SP excitations in such structures. We show that the symmetry of the emission is governed by polarization and its shape is defined the interference of SP waves of different diffraction orders. Near-Held pattern analysis combined with the far-Held reflection and transmission measurements suggests that the SP eigenmodes of these arrays may be understood as those of ionic plasmon molecules.
FDTD Simulation of Photonic-Crystal Lasers and Their Relaxation Oscillation
Song, G. Hugh ; Kim, Soan ; Hwang, Kyung-Hwan ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 87~95
DOI : 10.3807/JOSK.2002.6.3.087
We have developed an finite-difference time-domain program that can analyze photonic devices with gain and/or dispersion. As an example, a two-dimensional photonic-crystal laser is simulated. The simulation can show the relaxation oscillation behavior at extremely high current injection.
Nonlinear Localized Modes in Photonic Crystals
Park, Q-Han ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 96~99
DOI : 10.3807/JOSK.2002.6.3.096
We give a brief overview of nonlinear localized modes in photonic crystals. We explain how photonic crystals can potentially be important in making small scale active devices which operate in an all optical way. Two models to approach nonlinear photonic crystals, the coupled mode theory and the discrete lattice theory using a Green's function, are explained.
Another Quantum Eraser Experiment with Two-photon States of Light
Kim, Tae-Soo ; Ko, Jeong-Hoon ; Kim, Heonoh ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 100~104
DOI : 10.3807/JOSK.2002.6.3.100
The quantum eraser experiment was revisited, using entangled photons of visible light in a Hong-Ou-Handel type interferometer with a magnitude two orders higher than before in count rates. We introduced which-path information by polarization and subsequently erasied this information by means of polarizers in front of detectors. It was found that the visibility of the interference fringe is revived from 0% to 88% as the polarizers are changed from 0
Reduction of the Power Penalty Induced by Low-Frequency Tone Using Variable Decision Threshold Technique
Lee, Chang-Hee ; Kim, Sung-Man ; Baik, Jin-Serk ; Park, Kun-Youl ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 105~107
DOI : 10.3807/JOSK.2002.6.3.105
We propose 'variable decision threshold technique' to decrease the power penalty induced by low-frequency tones. The proposed scheme uses a simple low-speed receiver to change the decision threshold of the optical receiver according to the low-frequency tones. We demonstrate the proposed method at 2.5 Gb/s.
Lasing Modes of LD-Pumped Fiber Grating Lasers
Park, Dong-Wook ; Hwang, Joon-Hwan ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 108~116
DOI : 10.3807/JOSK.2002.6.3.108
Lasing modes of laser-diode-pumped fiber grating lasers are analyzed by coupled-mode theory. First, a power series solution of the coupled-mode equations is derived under the assumption of an exponentially-decreasing longitudinal modal gain profile for a laser-diode-pumped grating section, followed by determination of the transfer matrix for such a section. Based on these results, an eigenvalue equation for oscillation is then derived and solved numerically for the lasing modes of uniform and phase-shifted fiber grating lasers. Comparisons made with the uniform-gain results indicate that, surprisingly, the lasing mode characteristics are not as significantly altered as might be expected in most cases, even for a highly nonuniform gain profile. In the case of a phase-shifted grating, the phase-shift position appears to have a much greater impact on determining the threshold gain, the modal field distribution, and the front-to-back output power ratio.
Polarization Insensitive Fiber-Optic Refractometer based on a Side-polished Fiber Coupler with a Thick Glass Waveguide
Sohn, Kyung-Rak ; Song, Jae-Won ; Kim, Hyung-Pyo ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 117~120
DOI : 10.3807/JOSK.2002.6.3.117
Side-polished single-mode fiber covered with a thick planar-glass-waveguide is studied as a polarization-insensitive fiber-optic refractometer The properties of the device are very sensitive to the index variation of an upper cladding on top of the overlay waveguide. We investigate the spectral response, the polarization properties, and the relationship between the shift in coupling wavelength and the index variation of an upper cladding layer Index resolutions of the order of 10-4 have been achieved.
Effect of Mirror Misalignments on Optical Ray Path In a Ring Resonator
Lee, Dong-Chan ; Lee, Jae-Cheul ; Son, Seong-Hyun ; Cho, Hyun-Ju ;
Journal of the Optical Society of Korea, volume 6, issue 3, 2002, Pages 121~127
DOI : 10.3807/JOSK.2002.6.3.121
The operating principal of a ring laser gyroscope depends on the phase difference for the counter-propagating waves within a closed path. The reflecting mirrors mounted on the monoblock form the traveling waves. The manufacturing accuracy of the monoblock influences the traveling path of ray, the sensitivity of laser resonator for misalignments, and diffraction losses. A 3
3 ray transfer matrix was derived for optical components with centering and squaring errors in a ring resonator. The matrix can be utilized to predict the optical ray paths on the basis of the manufacturing errors of the monoblock as well as the misalignment of mirrors. Then the distance and orientation (o. slope) at the arbitrary plane inside the resonator along the ideal optical path can be calculated from the chain multiplication of the ray transfer matrix for each optical component in one round trip. We also show that the counter-propagating rays In a ring resonator with errors does not coincide in each round trip, which results in gain difference between two beams, and how these errors can be adjusted through the alignment procedure. Finally this 3
3 ray matrix formalism can be used to calculate the beam size and its displacement from the optical axis and the deviation at the diaphragm.