Dr. Huimin Liu Profile

Dr. Huimin Liu

Professor at Univ de Puerto Rico Mayagüez

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Publications (12)

Proceedings Article | 6 April 2006 Paper

Nonlinear optical characterization of silver nanoparticles embedded in phosphate glass

S. Lysenko, J. Jimenez, G. Zhang, H. Liu

Proceedings Volume 6170, 61701S (2006) https://doi.org/10.1117/12.658853

KEYWORDS: Silver, Absorption, Neptunium, Glasses, Nanoparticles, Particles, Nanocomposites, Scattering, Luminescence, Picosecond phenomena

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Proceedings Article | 6 April 2006 Paper

Ultrafast optical dynamics in VO₂

S. Lysenko, V. Vikhnin, G. Zhang, A. Rua, F. Fernandez, H. Liu

Proceedings Volume 6170, 61701R (2006) https://doi.org/10.1117/12.658811

KEYWORDS: Aluminum, Reflectivity, Reflection, Ultrafast phenomena, Crystals, Transient nonlinear optics, Optical pumping, Excitons, Picosecond phenomena, Vanadium

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Proceedings Article | 16 July 2003 Paper

Photoluminescence and NLO study of porous silicon and nanoparticle silicon in SIO2 matrix

Huimin Liu, L. Fonseca, A. Mahfoud, O. Resto, S. Weisz

Proceedings Volume 5061, (2003) https://doi.org/10.1117/12.517341

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Optical quality porous silicon (PSi) and nanoparticle crystalline-Si (c-Si) enriched SiO₂ materials were studied by absorption; luminescence; time-resolved emission measurements. Using tunable ultrafast laser as a light source, the excited state dynamics was also investigated. In a nonlinear optical (NLO) spectroscopic study the pulsed degenerate-four-wave-mixing (DFWM) technique was employed. In absorption measurement all samples show a broad and intense UV absorption with a cut-off edge at ~400 nm. In photoluminescence (PL) measurement, red emission can generally be observed in both Psi and c-Si samples. At 8 K the broadband PL of PSi is peaked at ~670 nm, with the PL lifetime in microseconds regime. The band maximum shifts toward low energy side while excitation wavelength increases. The particle size distribution was estimated using the optical transmission data according to the size- energy gap relationship. DFWM measurement reveals a long lived, slowly decaying signal which emerges from the coherent response. It indicates that the excitation was highly localized. For c-Si sample, the luminescence maximum was found at higher energy side around 590 nm, but the emission lifetime is much shortened to as ~10ns. In order to understand the nature of nanocomposite, Eu dopant was introduced into the sample. The investigation of luminescence and time-resolved emission of Eu³⁺shows that the c-Si nanoparticles are distributed in SiO₂ matrix with an average size of the nanoparticles being around 2.2 nm. The valence band (VB) to conduction band (CB) energy gap is about 2.7 ev. By ultrashort (femtoseconds and picoseconds) laser pulse excitation the charge carriers produced in CB of c-Si nanoparticles contributes to the observed optical responses. The excited state dynamical process associated with the movement of charge carriers is characterized by an instantaneous response signal, followed by buildup of the slowly decaying signal within 500ps. The analysis of the charge creation, trapping and reactivation is discussed.

Proceedings Article | 14 February 2003 Paper

Two-photon-excitation-induced transient valence switching in Eu-doped Si/SiO2 nanocomposites

Huimin Liu, V. Vikhnin, L. Fonseca, A. Mahfoud, G. Nery, O. Resto, Z. Weisz

Proceedings Volume 4797, (2003) https://doi.org/10.1117/12.453276

KEYWORDS: Europium, Silicon, Ions, Nanoparticles, Luminescence, Erbium, Switching, Annealing, Nanocomposites, Absorption

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Proceedings Article | 7 June 2000 Paper

Pulsed-laser deposition growth of SBN and correlation study of structure and optical properties

Felix Fernandez, Yelitza Gonzalez, Huimin Liu, Edgardo Rodriguez, Victor Rodriguez, Weiyi Jia

Proceedings Volume 3933, (2000) https://doi.org/10.1117/12.387556

KEYWORDS: Absorption, Silica, Glasses, Crystals, Optical properties, Thin films, Strontium, Barium, Diffraction, Reflection

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Proceedings Article | 22 May 2000 Paper

Acoustic wave determination by degenerate four-wave mixing using ultrafast laser pulses

Huimin Liu, Azizz Mafould, Armando Yance

Proceedings Volume 4072, (2000) https://doi.org/10.1117/12.386728

KEYWORDS: Acoustics, Laser spectroscopy, Crystals, Diffraction, Laser beam diagnostics, Laser crystals, Absorption, Scattering, Modulation, Phonons

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Proceedings Article | 4 December 1998 Paper

Modulation of the nonlinear optical response by KNbO3 thin films deposited on a KTaO3 substrate

Huimin Liu, Weiyi Jia, Yanyung Wang, Y. Fu, Lynn Boatner

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328620

KEYWORDS: Superlattices, Crystals, Luminescence, Thin films, Modulation, Thin film deposition, Nonlinear optics, Niobium, Ions, Potassium

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Proceedings Article | 8 October 1998 Paper

Transient grating in KNbO3/KTaO3 superlattice

Huimin Liu, Felix Fernandez, Weiyi Jia, Lynn Boatner

Proceedings Volume 3425, (1998) https://doi.org/10.1117/12.326664

KEYWORDS: Superlattices, Crystals, Thin films, Nonlinear optics, Nonlinear crystals, Picosecond phenomena, Potassium, Pulsed laser operation, Ions, Transient nonlinear optics

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Proceedings Article | 3 March 1997 Paper

Frequency shift and vibronic relaxation of Raman modes in barium nitrate molecular ionic crystal

Peter Zverev, Weiyi Jia, Huimin Liu

Proceedings Volume 3090, (1997) https://doi.org/10.1117/12.267762

KEYWORDS: Raman spectroscopy, Phonons, Crystals, Barium, Raman scattering, Temperature metrology, High temperature raman spectroscopy, Ions, Scattering, Silver

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Proceedings Article | 7 October 1996 Paper

Degenerate four-wave mixing of nonether polyphenylquinoxaline solution

Huimin Liu, Yanyun Wang, Weiyi Jia, Meng Shen, Shoukuan Fu

Proceedings Volume 2853, (1996) https://doi.org/10.1117/12.253480

KEYWORDS: Acoustics, Phonons, Absorption, Polymers, Picosecond phenomena, Four wave mixing, Diffraction, Laser beam diagnostics, Nonlinear optics, Pulsed laser operation

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Proceedings Article | 17 June 1993 Paper

Nonlinear optical responses of photorefractive crystals

Richard Powell, Huimin Liu, Istvan Foldvari, Scott Holmstrom, Roger Reeves

Proceedings Volume 1861, (1993) https://doi.org/10.1117/12.147056

KEYWORDS: Crystals, Absorption, Niobium, Picosecond phenomena, Polarization, Nonlinear crystals, Photorefraction, Ions, Laser crystals, Signal processing

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Proceedings Article | 1 April 1992 Paper

Characteristics of the photorefractive effect in Bi2TeO5

Istvan Foldvari, Huimin Liu, Richard Powell

Proceedings Volume 1626, (1992) https://doi.org/10.1117/12.58075

KEYWORDS: Crystals, Laser beam diagnostics, Signal processing, Nonlinear crystals, Diffraction, Nonlinear optics, Diffraction gratings, Laser crystals, Ions

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Showing 5 of 12 publications

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