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FDTD Simulation of Photonic-Crystal Lasers and Their Relaxation Oscillation
Song, G. Hugh,Kim, Soan,Hwang, Kyung-Hwan Optical Society of Korea 2002 Current Optics and Photonics Vol.6 No.3
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.
Excitation Wavelength Dependence of Terahertz Radiation from InAs: UV versus IR
Hoonill Jeong,Jihoon Jeong,G. Hugh Song,조영달 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1
Terahertz (THz) radiation measurements from p-doped InAs (carrier density:~7 × 1017 cm−3)surfaces were carried out encompassing both IR (770–830 nm) and UV (360–385 nm) excitations by employing two synchronized femtosecond lasers. Each laser was independently tunable, and the jitter was controlled below the pulse width (~150 fs). One laser was used for THz generation,and the other for detection via a photoconductive antenna. For the IR-pulse excitation, two frequency components were observed, between which the higher-side peak disappeared as we tuned the excitation wavelength toward the UV range.