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Dive into the research topics where Taeyoon Hong is active.

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Featured researches published by Taeyoon Hong.


Journal of Applied Physics | 2014

Reflection terahertz time-domain spectroscopy of RDX and HMX explosives

Kyujin Choi; Taeyoon Hong; Kyung Ik Sim; Taewoo Ha; Byung Cheol Park; Jin Hyuk Chung; Soo Gyeong Cho; Jae Hoon Kim

We report on our study of RDX and HMX, two of the most commonly used explosive materials, in bulk pellets with reflection terahertz time-domain spectroscopy in the frequency range of 0.3–3 THz. The maximum entropy method was utilized to correct our raw reflection data against the phase error due to the relative displacement between the sample and the reference. Both the refractive index n and the extinction coefficient k in the terahertz region were acquired for these two explosives without a Kramers-Kronig analysis. Both RDX and HMX exhibit a series of distinct peaks not quite detectable in the more conventional transmission-type measurements due to their high terahertz absorptivity. Our results are compared with the literature data on powder samples.


Applied Physics Letters | 2013

Terahertz and optical study of monolayer graphene processed by plasma oxidation

Kyujin Choi; Juhwan Lim; J. R. Rani; Hyong Seo Yoon; Juyeong Oh; Taeyoon Hong; Taewoo Ha; Byung Cheol Park; Kyung Ik Sim; Seong Chan Jun; Jae Hoon Kim

We report on our terahertz and optical study of monolayer graphene grown by chemical vapor deposition and processed by plasma oxidation. The plasma oxidation induces oxygen-related defects, and the resulting disorder increases the sheet resistance of graphene as measured via terahertz spectroscopy. The excitonic absorption peak weakens considerably and blue shifts upon plasma oxidation, resulting in higher transmittance in both the visible and ultraviolet regions. Our oxygen plasma-treated graphene also exhibits a free-carrier doping effect as confirmed by the blue shift of the Raman G band.


Journal of Optics | 2015

Double Fano resonances in a composite metamaterial possessing tripod plasmonic resonances

Y. U. Lee; Eun Young Choi; E. S. Kim; J. H. Woo; Boyoung Kang; J. Kim; Byung Cheol Park; Taeyoon Hong; Jae-Hoon Kim; J. W. Wu

Double Fano resonances are observed in a planar composite metamaterial possessing tripod plasmonic resonances, where a common subradiant driven oscillator is coupled with two superradiant oscillators. As a classical analogue of four-level tripod atomic system, the extinction spectrum of the composite metamaterial exhibits a coherent effect based on double Fano resonances. It is shown that a transfer of the absorbed power between two orthogonal superradiant oscillators is mediated by a common subradiant oscillator.


Journal of Applied Physics | 2013

Terahertz electrodynamics and superconducting energy gap of NbTiN

Taeyoon Hong; Kyujin Choi; Kyung Ik Sim; Taewoo Ha; Byung Cheol Park; Hirotake Yamamori; Jae Hoon Kim

Terahertz electrodynamics of superconducting NbTiN has been studied in the spectral range of 8-70 cm–1 above and below the critical temperature of Tc = 14.1 K. Our transmission terahertz time-domain spectroscopy technique allows for independent and accurate determination of both the real part σ1 and the imaginary part σ2 of the optical conductivity σ as a function of frequency ω and temperature T without a Kramers-Kronig analysis. A clear signature of the superconducting energy gap Δ(T) is observed in the real part σ1 of the optical conductivity below Tc, with 2Δ(0) = 36.5 cm−1 corresponding to 2Δ(0)/kBTc = 3.72. No indication of strong-coupling effects was observed in the imaginary part σ2 toward zero frequency. Our results, including the temperature dependence of the penetration depth λ(T), are in excellent quantitative agreement with weak coupling BCS theory and Mattis-Bardeen formula.


Proceedings of SPIE | 2015

Double Fano resonances in a composite metamaterial possessing tripod plasmonic resonances (Presentation Recording)

Jeong-Weon Wu; Y. U. Lee; Eun Young Choi; E. S. Kim; J. H. Woo; Boyoung Kang; J. Kim; Byung Cheol Park; Taeyoon Hong; Jae-Hoon Kim

We experimentally demonstrate a classical analogue of double Fano resonances in a planar composite metamaterial possessing tripod plasmonic resonances, where a common subradiant dipole corresponding to the dark mode is coupled with two superradient dipoles corresponding to two bright modes. The composite metamaterial is structured such that four-rod resonators (FRR) are embedded inside double-split ring resonators (DSRR) superlattice. Two dipole resonances of DSRR are superradiant modes and one dipole resonance of FRR is subradiant mode. Proximity of the inner diameter of DSRR and the rod-length of FRR permits near field coherent couplings, and the composite metamaterial is a tripod metamaterial system possessing two superradiant dipole resonances of DSRR coupled coherently with one common subradiant dipole resonance of FRR in near field, similar to a tripod atomic system with four atomic levels coupled coherently by coherent optical fields. Important finding is that double Fano resonances in the composite metamaterial are correlated, showing up as a transfer of the absorbed power from one superradiant dipole to the other superradient dipole in DSRR. The general feature of plasmonic Fano resonance is examined where both superradiant and subradiant oscillators are externally driven. Analysis based on two coupled oscillators model leads to the fact that the characteristic asymmetric Fano resonance formula of plasmonic structure is kept the same with a modication in the asymmetry parameter q.


international conference on infrared, millimeter, and terahertz waves | 2009

Time-domain terahertz spectroscopy of LaSrAlO 4

Taeyoon Hong; Seung Jin Heo; Jae-Hoon Kim; Ivan Bozovic

Single crystal lanthanum strontium aluminate, LaSrAlO4 (001), was investigated by means of time-domain terahertz transmission spectroscopy. We extracted the optical constants at frequencies from 3 to 100 cm−1 and at temperatures from 4 to 300 K by inverting the measured complex transmission coefficient without resorting to a Kramers-Kronig analysis. The refractive index was almost independent of temperature in the terahertz range.


Journal of the Korean Physical Society | 2014

Terahertz time-domain and Fourier-transform infrared spectroscopy of traditional Korean pigments

Taeyoon Hong; Kyujin Choi; Taewoo Ha; Byung Cheol Park; Kyung Ik Sim; Jong Hyeon Kim; Jae-Hoon Kim; Jy Eun Kwon; Sang-Hyun Lee; Dai Ill Kang; Han Hyoung Lee


Progress in Superconductivity and Cryogenics | 2013

Terahertz time-domain transmission and reflection spectroscopy of niobium

Taeyoon Hong; Kyujin Choi; Byoung-Cheol Park; Taewoo Ha; Kyung Ik Sim; Dong-Gwang Ha; Yonuk Chong; Jae Hoon Kim


international conference on infrared, millimeter, and terahertz waves | 2012

Terahertz study of reduced graphene oxide

Kyujin Choi; Juhwan Lim; Taeyoon Hong; Taewoo Ha; Byung Cheol Park; Kyung Ik Sim; Jin-Seon Kim; Changgu Lee; Seong Chan Jun; Jae-Hoon Kim


Physica C-superconductivity and Its Applications | 2010

Infrared spectroscopy of pseudogaps in electron-doped superconductors

Kyujin Choi; Taeyoon Hong; S.R. Park; Dong Joon Song; Changyoung Kim; H. Eisaki; Jae H. Kim

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Jae Hoon Kim

Chungnam National University

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E. S. Kim

Ewha Womans University

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J. H. Woo

Ewha Womans University

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