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A Dual-Concentric-Core Photonic Crystal Fiber for Broadband Dispersion Compensation
Soan Kim,기철식,고도경,Jongmin Lee,오경환 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
We propose dual-concentric-core photonic-crystal fibers that may be useful in compensating for the dispersion of a single-mode fiber over nearly the entire optical communication wavelength range. The dual concentric core is composed of a germano-silicate high-index inner core and a outer core that is formed by shifting the air holes of the first layer of cladding to the inner core. The dispersion characteristics of the fiber are theoretically investigated by using the semi-vectorial beam propagation method. The influence of the core structures on the dispersion characteristics are reasonably analyzed by using the effective index model. The dispersion of the fiber is larger than .450 ps/(km.nm) in the range from 1450 nm to 1600 nm and reach as .600 ps/(km.nm) around 1550 nm. Thus, the proposed photonic-crystal fiber can compensate for the dispersion of a conventional single-mode fiber to within 0 ± 2 ps/(km.nm) over the S, C, and L bands.
Modified Reverse Transcription Loop-mediated Isothermal Amplification (RT-LAMP)
Soan PARK,Jeong Wook LEE 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Reverse transcription loop-mediated isothermal amplification (RT-LAMP) is widely used isothermal amplification method for nucleic acid detections due to its sensitivity and specificity. However, RT-LAMP cannot be coupled with RNA detection systems such as a toehold switch system because amplification products after LAMP reaction are only DNA. Here, we modified an inner primer of RT-LAMP to include a T7 promoter and combined it with a paper-based toehold switch system. Compared to nucleic acid sequence based amplification (NASBA) with a toehold switch, this assay has short reaction time and lower limit of detection. This study also extended the scope of the diagnostic system in which LAMP can be used by introducing a strategy to convert LAMP product to RNA.
Single-mode Condition and Dispersion of Terahertz Photonic Crystal Fiber
Kim, Soan,Kee, Chul-Sik,Lee, Jong-Min Optical Society of Korea 2007 Current Optics and Photonics Vol.11 No.3
We have investigated properties of a plastic photonic crystal fiber guiding terahertz radiations, THz photonic crystal fiber. The single-mode condition and dispersion of a plastic triangular THz photonic crystal fiber are investigated by using the plane wave expansion method and the beam propagation method. The THz photonic crystal fiber can perform as a single-mode fiber below 2.5 THz when the ratio of diameter (d) and period (${\Lambda}$) of air holes is less than 0.475. The THz photonic crystal fiber with ${\Lambda}=500{\mu}m$ and $d/{\Lambda}=0.4$ shows almost zero flattened dispersion behavior, $-0.03{\pm}0.02 ps/THz{\cdot}cm$, in the THz frequency range from 0.8 to 2.0 THz.
Modified rectangular lattice photonic crystal fibers with high birefringence and negative dispersion
Kim, Soan,Kee, Chul-Sik,Lee, Chung Ghiu The Optical Society 2009 Optics express Vol.17 No.10
<P>We propose a modified rectangular lattice PCF and numerically investigate its birefringence and dispersion. Based on the plane wave expansion method, it is shown that the proposed structure provides high birefringence and negative dispersion. Numerical results show that the birefringence of the modified PCF reaches 10(-2) and the leakage loss is about 1000 times smaller than that of an original rectangular PCF because the modification gives rise to the strong confinement of guided modes. Dispersion and its slope are also negative over the C band.</P>
Dispersion properties of dual-core photonic-quasicrystal fiber
Kim, Soan,Kee, Chul-Sik The Optical Society 2009 Optics express Vol.17 No.18
<P>We propose a photonic quasi-crystal fiber with a dual-core structure. The circular-like outer core caused by the quasi-periodic arrangement gives rise to an interesting dispersion property that is different from that of a photonic crystal fiber with a dual-core structure. The absolute value of negative dispersion for the dual-core photonic quasi-crystal fiber increases as the distance between the nearest holes increases, while the absolute value of negative dispersion for the dual-core photonic crystal fiber decreases. The dispersion property can be useful in reducing the coupling loss between the compensating dispersion fiber and a conventional single mode fiber.</P>