THz Reserach Lab

Yun-Shik Lee

Associate Professor

Department of Physics

Oregon State University

Corvallis, OR 97331-6507 USA

Office: (541) 737-5057

Fax: (541) 737-1683

Welcome to my Web site!

You can find my research interests and course information here.

Research Interests

- Generation and manipulation of THz pulses via optical rectification in nonlinear crystals

- Control of quantum coherence in semiconductor nanostructures using femtosecond laser and THz spectroscopy

- Study of large amplitude motions in proteins via THz time-domain spectroscopy (THz-TDS)

Recent Publications

“Interaction of Strong Single-Cycle Terahertz Pulses with Semiconductor Quantum Wells,” J.R. Danielson, Yun-Shik Lee, J.P. Prineas, J.T. Steiner, M. Kira, and S.W. Koch, accepted in Phys. Rev. Lett.

 “Multi-photon absorption and nonlinear refraction of GaAs in the mid-infrared,” W. Hurlbut, Yun-Shik Lee, K. L. Vodopyanov, P. S. Kuo, and M. M. Fejer, Opt. Lett. 32, 668 (2007).

“Generation of arbitrary THz waveforms in fanned-out periodically-poled lithium niobate,” J. R. Danielson, N. Amer, and Yun-Shik Lee, Appl. Phys. Lett. 89, 211118 (2006).

“Generation of multi-cycle terahertz-pulses via optical rectification in periodically-inverted GaAs structures,” Yun-Shik Lee, W. Hurlbut, K. L. Vodopyanov, M. M. Fejer, and V.G.Kozlov,  Appl. Phys. Lett. 89, 181104 (2006).

“Terahertz wave generation in quasi-phase-matched GaAs,” K. L. Vodopyanov, M. M. Fejer, X. Yu, J. S. Harris, Y. -S. Lee, W. C. Hurlbut , V.G.Kozlov, Appl. Phys. Lett. 89, 141119 (2006).

Laser Focus World, April 1, 2005

Poled lithium niobate crystals enable multicycle THz pulse generation

"The terahertz frequency range (approximately 0.1 to 10 THz) lies between the microwave and infrared regimes of the electromagnetic (EM) spectrum, but terahertz (THz) science and technology lags considerably behind the microwave and infrared regimes because of significant limitations in coherent THz generation and detection...."
 

Phtonics Spectra March 2003 issue carries an article to introduce the research of our group.

Crystals Shape Terahertz Pulses
"Scientists at Oregon State University in Corvallis have experimentally and theoretically examined the pulse shaping of terahertz radiation by optical rectification in poled lithium niobate. They suggest that the technique, which they reported in the Jan. 13 issue of Applied Physics Letters, will find applications in terahertz spectroscopy. In the experiments, the researchers focused 100-fs pulses of 800-nm radiation from a Ti:sapphire oscillator into engineered stacks of poled LiNbO3 to produce terahertz waveforms that corresponded to the domain structures of the crystal. Although the results agreed qualitatively with their calculations, they discovered quantitative errors that they attributed to oversimplifications in the model. The scientists noted that successful pulse shaping will require a better understanding of the linear dispersion of the material in the terahertz region."