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Scalar wave scattering by a circular cylinder on a planar substrate: a numerical simulation
Tsermaa Baatarchuluun,Kim Jin Seung,Myung-Whun Kim 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.78 No.2
We calculated the scalar wave scattering by an infinitely long circular cylinder on or near a planar substrate. Our calculation is based on a rigorous theoretical solution. We present the angular distributions of the scattered and the transmitted waves due to the cylinder and those of the reflected and the transmitted waves due to the planar substrate. The numerical simulations show the importance of higher order multiple scattering when the cylinder is located close to the substrate. The simulation results are applicable to the general case because they are not restricted by the physical and the geometrical natures of the cylinder and the planar substrate.
Construction of a Broad-Band Optical Isolator by Using an Achromatic Circular Polarizer
Baatarchuluun TSERMAA,Jin Seung KIM,Byeong-Kwan YANG 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
This paper reports an experimental study of a broadband optical isolator, which consists of a polarizing beam splitter, half- and quarter-wave plates of zero-order aligned to proper orientations. Compared with the commonly used optical isolator based on the Faraday rotator, the proposed isolator is cost effective and has a much wider working bandwidth. An experimental test of the prototype system shows that the isolator provides a significant reduction of the optical feedback over a wide range of wavelengths.
Sensitivity Improvement of SPIDER by Applying a Crystal Dithering Technique
Baatarchuluun Tsermaa,김명훈,이금휘,김진승 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.4
We propose an improved spectral phase interferometry for direct electric-field reconstruction (SPIDER) technique for the characterization of ultrashort laser pulses with substantially better sensitivity. We improved the conventional SPIDER by applying the technique of crystal dithering, which has been used in the frequency-resolved optical gating (FROG) technique. We analyzed the effectiveness of the proposed method theoretically and confirmed it experimentally.
Characterization of Supercontinuum and Ultraviolet Pulses by Using XFROG
Baatarchuluun Tsermaa,Byung Kwan Yang,김명훈,김진승 한국광학회 2009 Current Optics and Photonics Vol.13 No.1
We present cross-correlation frequency-resolved optical gating (XFROG) measurements of supercontinuum pulses generated by using a photonic crystal fiber (PCF), and ultraviolet (UV) pulses generated by frequency doubling of infrared ultra-short pulses. Since supercontinuum pulses have broad spectra, XFROG measurement typically requires using an extremely thin nonlinear crystal which has a thickness of sub-ten microns. Instead of using such a thin crystal, we employed a relatively thick crystal which was mounted on a galvanometer in order to achieve a phase-matching over the whole spectral bandwidth of the supercontinuum pulses by a crystal-dithering technique. Experimental results of the retrieved phase and intensity were in fair agreement with the independently measured data.
Light Scattering by Two Concentric Optically Active Spheres: II. Numerical Results
Baatarchuluun TSERMAA,Jin Seung KIM,Jun Keun Chang 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
This paper deals with a numerical study of the optical scattering characteristics of concentric double spheres with optical activities both in the shell and the nucleus. The computer subroutine for this work was developed on the basis of a previous work on the analytical theory. This work suggests a new optical diagnostic method for distinguishing particles containing optically active nuclei from particles without nuclei or with optically inactive nuclei on the basis of their scattering signatures, including polarization states.
A Sub-10-fs Ti:Sapphire Oscillator with a Simple Four-Mirror Cavity
Baatarchuluun Tsermaa,김진승,Byeong Kwan Yang,서재명 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.4
Optical pulses of 9.4 fs are stably generated from a Kerr-lens mode-locked Ti:sapphire laser oscillator containing only four mirrors, including two double-chirped mirrors. To the best of our knowledge, the oscillator has the simplest cavity design compared with other sub-10-fs oscillators reported yet. The balanced distribution of the negative group delay dispersion within the cavity yields improved stability against intensity fluctuations.
Lattice Dynamics Driven by Tunneling Current in 1T′ Structure of Bilayer VSe2
Duvjir Ganbat,Kim Jungdae,Tsermaa Baatarchuluun,Choi Byoung Ki,Chang Young Jun 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.11
Interesting lattice dynamics were recently reported in 1T` structure of bilayer VSe2 attributed to the vibration of Se atoms, but it was limited to topographic observation using scanning tunneling microscopy (STM). We conduct further systematic STM study to understand the origin of lattice dynamics in bilayer VSe2. Time spectroscopy of tunneling current is measured with the feedback loop disabled, while holding the position of the STM tip over a single Se atom. The time spectroscopy indeed shows random telegraph signals that tunneling current fluctuates between high and low currents. Such fluctuations of current reflect the vibrational motion of the Se atom. Statistical analysis described by the Markov process provides average residence time (τ) for high and low current states, and transition rate (R = 1/τ). Interestingly, the transition rate as a function of tunneling current (I) follows a power law of R = IN (N = constant), and the N value is close to 1. This linearity of transition rate indicates that the lattice dynamics are mostly induced by tunneling current. Our result confirms the role of tunneling current that drives the observed lattice dynamics in the bilayer VSe2.
Room temperature optical anisotropy of a LaMnO3 thin-film induced by ultra-short pulse laser
Munkhbaatar, Purevdorj,Marton, Zsolt,Tsermaa, Baatarchuluun,Choi, Woo Seok,Seo, Sung S. Ambrose,Kim, Jin Seung,Nakagawa, Naoyuki,Hwang, Harold Y.,Lee, Ho Nyung,Myung-Whun, Kim American Institute of Physics 2015 APPLIED PHYSICS LETTERS Vol.106 No.9