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6 results on '"Yi-Hsing Peng"'

1. Improved degenerate four wave mixing for measuring complex χ(3)

Author

Weilou Cao, J. Goldhar, C.H. Lee, Warren N. Herman, and Yi-Hsing Peng

Subjects
chemistry.chemical_classification, Physics, business.industry, Nonlinear optics, Polymer, Nonlinear system, Four-wave mixing, Optics, Signal-to-noise ratio, chemistry, Phase grating, Degenerate four wave mixing, business, Diffraction grating
Abstract

We report improvements on a technique for measuring the complex chi(3) of nonlinear polymers using a 2D phase grating and degenerate four wave mixing. These improvements produce a factor of 100 increase in the signal to noise ratio.

Published
2008

2. Study of transient effects in photo-excited semiconducting polymer and bulk heterojunctions

Author

Yi-Hsing Peng, Min Du, Chi H. Lee, D. B. Romero, Weilou Cao, and Warren N. Herman

Subjects
Organic semiconductor, Optical rectification, Materials science, business.industry, Terahertz radiation, Excited state, Optoelectronics, Heterojunction, Quantum efficiency, Polymer blend, business, Terahertz spectroscopy and technology
Abstract

Transient dynamics of photoexcited carriers in MEH-PPV, PCBM-C60 and their blend is investigated by THz-TDS using a 400 nm optical pump and terahertz probe. Free and bound carriers are revealed in the measurement of the complex conductivity.

Published
2007

3. Transient Properties of Photoexcited Inorganic and Organic Semiconductors using Terahertz Time Domain Spectroscopy

Author

Victor Yun, C.H. Lee, Weilou Cao, Yi-Hsing Peng, and Warren N. Herman

Subjects
Materials science, Silicon, Terahertz radiation, business.industry, chemistry.chemical_element, Drude model, Terahertz spectroscopy and technology, Organic semiconductor, Semiconductor, chemistry, Optoelectronics, business, Spectroscopy, Terahertz time-domain spectroscopy
Abstract

Transient optical and electronic properties of photoexcited, semiconductor (p-type silicon) and semiconducting polymer (MEH-PPV/PCBM) are measured by terahertz time-domain spectroscopy using a 400 nm optical pump and terahertz probe. The semiconductor data is fit using a simple Drude model. The semiconducting polymer data shows very fast carrier rise time and decay time

Published
2006

4. Measurement of transient photoconductivity and carrier density in MEH-PPV polymer thin films

Author

Weilou Cao, Yi-Hsing Peng, Min Du, Warren N. Herman, C.H. Lee, Hongye Liang, and Younggu Kim

Subjects
Electron mobility, Materials science, business.industry, Attenuation coefficient, Photoconductivity, Optoelectronics, Quantum efficiency, Carrier lifetime, Transient (oscillation), Thin film, business, Refractive index
Abstract

Photoconductivity, photo-carrier density and lifetime in MEH-PPV were obtained by direct measurement of photo-conductivity and photo-induced change in reflectivity. Fast transient carrier mobility of 800 (cm2/Vs) and quantum efficiency of 0.5% were estimated.

Published
2006

5. Terahertz generation in poled polymers

Author

Yi-Hsing Peng, G.D. Hutchinson, Weilou Cao, Min Du, Younggu Kim, C.H. Lee, Warren N. Herman, and Hongye Liang

Subjects
chemistry.chemical_classification, Materials science, business.industry, Terahertz radiation, Nonlinear optics, Polymer, Laser, Terahertz spectroscopy and technology, law.invention, Optics, chemistry, law, Thz radiation, Optoelectronics, business, Thz spectroscopy, Microwave photonics
Abstract

THz radiation power dependence on pump laser spot size was explored using a poled polymer and the electro-optic coefficient of the polymer was estimated. THz spectroscopy on several UV-curable passive polymers was also carried out.

Published
2005

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