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Start Over Author "Wang, Zhuan" Publisher iop publishing
13 results on '"Wang, Zhuan"'

1. Observation of Photoinduced Polarons in Semimetal 1T-TiSe2

Author

Huang, Yin, primary, Sen-Hao, Lv, additional, Liu, Heyuan, additional, Cheng, Qiuzhen, additional, Biao, Yi, additional, Lu, Hongliang, additional, Lin, Xiao, additional, Wang, Zhuan, additional, Yang, Haitao, additional, Chen, Hailong, additional, and Weng, Yu-Xiang, additional

Published
2023
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2. Observation of photoinduced polarons in semimetal 1T-TiSe2.

Author

Huang, Yin, Lv, Senhao, Liu, Heyuan, Cheng, Qiuzhen, Biao, Yi, Lu, Hongliang, Lin, Xiao, Wang, Zhuan, Yang, Haitao, Chen, Hailong, and Weng, Yu-Xiang

Subjects
POLARONS, LATTICE dynamics, ACOUSTIC phonons, CHARGE carrier mobility, SINGLE crystals, PHOTOEXCITATION
Abstract

In this work, ultrafast carrier dynamics of mechanically exfoliated 1T-TiSe2 flakes from the high-quality single crystals with self-intercalated Ti atoms are investigated by femtosecond transient absorption spectroscopy. The observed coherent acoustic and optical phonon oscillations after ultrafast photoexcitation reveal the strong electron–phonon coupling in 1T-TiSe2. The ultrafast carrier dynamics probed in both visible and mid-infrared regions indicate that some photogenerated carriers localize near the intercalated Ti atoms and form small polarons rapidly within several picoseconds after photoexcitation due to the strong and short-range electron–phonon coupling. The formation of polarons leads to a reduction of carrier mobility and a long-time relaxation process of photoexcited carriers for several nanoseconds. The formation and dissociation rates of the photoinduced polarons are dependent on both the pump fluence and the thickness of TiSe2 sample. This work offers new insights into the photogenerated carrier dynamics of 1T-TiSe2, and emphasizes the effects of intercalated atoms on the electron and lattice dynamics after photoexcitation. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Negative Dispersion Mirrors in Ta 2 O 5 /SiO 2 for Femtosecond Ti:Sapphire Lasers by Using Gires–Tournois Interferometers

Author

Liao Chun-yan, Wang Zhuan, Zhang Zhi-gang, Fan Zheng-Xiu, Shao Jian-Da, and WU Zu-bin

Subjects
Ion beam sputtering, Materials science, business.industry, General Physics and Astronomy, Laser, law.invention, Optics, law, Femtosecond, Dispersion (optics), Sapphire, Astronomical interferometer, Optoelectronics, business
Abstract

We design and experimentally demonstrate some negative dispersion mirrors with optimized Gires-Tournois interferometers. The mirror structure is composed of 38 alternating Ta2O5 and SiO2 layers and could be regarded as two sections: high-reflectivity section consisting of a series of quarter-wavelength optical thickness stacks and negative-dispersion section consisting of only 13 layers. The designed mirrors exhibit the expected performance. These mirrors were fabricated by using ion beam sputtering. By adopting such mirrors, dispersion of a mode-locked femtosecond Ti:sapphire laser has been compensated for mostly. With two series of the mirrors, 32 fs and 15 fs pulses have been obtained respectively.

Published
2005

6. Experimental Study of Optical Nonlinearities in a Broadband Semiconductor Saturable Absorber Mirror

Author

Wang Qing-Yue, Wang Kai, Xing Qi-Rong, Mao Fang-Lin, Zhang Zhi-Gang, Wang Zhuan, LI Shu-Xin, Chai Lu, and Lang Li-Ying

Subjects
Physics, Nonlinear system, Optics, business.industry, Broadband, Reflection (physics), General Physics and Astronomy, Semiconductor saturable absorber, business
Abstract

The negative nonlinear index of a semiconductor saturable absorber mirror (SESAM) was investigated by using the reflection Z-scan technique. This is an experimental demonstration, for the first time to our knowledge, that the SESAM possesses comparable negative nonlinear index n2 = ?2.35?10?10?esu, which may have important implications in design and alignment of Kerr-lens mode-locking based on the self-focusing effect.

Published
2004

13. Observation of photoinduced polarons in semimetal 1T-TiSe2.

Author

Huang, Yin, Lv, Senhao, Liu, Heyuan, Cheng, Qiuzhen, Biao, Yi, Lu, Hongliang, Lin, Xiao, Wang, Zhuan, Yang, Haitao, Chen, Hailong, and Weng, Yu-Xiang

Subjects
*POLARONS, *LATTICE dynamics, *ACOUSTIC phonons, *CHARGE carrier mobility, *SINGLE crystals, *PHOTOEXCITATION
Abstract

In this work, ultrafast carrier dynamics of mechanically exfoliated 1T-TiSe2 flakes from the high-quality single crystals with self-intercalated Ti atoms are investigated by femtosecond transient absorption spectroscopy. The observed coherent acoustic and optical phonon oscillations after ultrafast photoexcitation reveal the strong electron–phonon coupling in 1T-TiSe2. The ultrafast carrier dynamics probed in both visible and mid-infrared regions indicate that some photogenerated carriers localize near the intercalated Ti atoms and form small polarons rapidly within several picoseconds after photoexcitation due to the strong and short-range electron–phonon coupling. The formation of polarons leads to a reduction of carrier mobility and a long-time relaxation process of photoexcited carriers for several nanoseconds. The formation and dissociation rates of the photoinduced polarons are dependent on both the pump fluence and the thickness of TiSe2 sample. This work offers new insights into the photogenerated carrier dynamics of 1T-TiSe2, and emphasizes the effects of intercalated atoms on the electron and lattice dynamics after photoexcitation. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
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