49 citations · 315 across the 41 of their papers we have counts for
7 papers · 1 filter
Generating Functional in String Field Theory
Am-Gil Ri, Tae-Song Kim, Song-Jin Im
In our paper, we introduce a path integral of general functional field in order to build the path integral formalism in string field theory from the fact that a string field is a f…
Influence of Pulse width and Rabi frequency on the Population dynamics of three-level system in two-photon absorption process
Nam-Chol Kim, Myong-Chol Ko, Song-Jin Im +1
We investigate the population dynamics of the three-level system in the two-photon absorption (TPA) process, mainly focusing the influence of pulse width and Rabi frequency on the…
Exciton-Plasmon Coupling Effects on the Nonlinear Optical Susceptibility of Hybrid Quantum Dot-Metallic Nanoparticle System
Nam-Chol Kim, Myong-Chol Ko, Song-Jin Im +1
We have studied theoretically the exciton-plasmon coupling effects on the third-order optical nonlinearity of a coherently coupled hybrid system of a metal nanoparticle and a semic…
New discrete method for investigating the response properties in finite electric field
Myong Chol Pak, Nam-Hyok Kim, Hak-Chol Pak +1
In this paper we develop a new discrete method for calculating the dielectric tensor and Born effective charge tensor in finite electric field by using Berry's phase and the gauge…
Document watermarking based on digital holographic principle
Chol-Su Kim, Kwang-Hyok Jong, Song-Jin Im
A new method for document watermarking based on the digital Fourier hologram is proposed. It applies the methods of digital image watermarking based on holographic principle presen…
Micro-joule sub-10-fs VUV pulse generation by MW pump pulse using highly efficient chirped-four-wave mixing in hollow-core photonic crystal fibers
Song-Jin Im
We theoretically study chirped four-wave mixing for VUV pulse generation in hollow-core photonic crystal fibers. We predict the generation of sub-10-fs VUV pulses with energy of up…