Results 261 to 270 of about 55,378 (308)

Photothermal effect in Semiconductors

Physical Review, 1961
When a sample of semiconducting material is illuminated, pairs of excess carriers are generated which diffuse through the material according to the density gradients established. Each pair carries an energy approximately equal to the band gap of the material.
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Photothermal Dielectric Effect with Liquid

Japanese Journal of Applied Physics, 1996
A new photothermal technique for measuring the thermal characteristics of a liquid is proposed. This is based on the temperature characteristic of the dielectric constant of light-irradiated liquid. When an alternating temperature change occurs in a liquid material due to the absorption of chopped light, an alternating variation of ...
Yasuo Cho Yasuo Cho, Tomoyuki Kumamaru Tomoyuki Kumamaru   +1 more
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Effect of nucleants in photothermally assisted crystallization

Photochemical & Photobiological Sciences, 2017
Laser-induced crystallization is emerging as a promising technique to crystallize biomolecules like amino acids and proteins. The use of external materials as nucleants and novel seeding methods open new paths for protein crystallization. We report here the results of experiments that explore the effect of nucleants on laser-based crystallization of ...
T, Shilpa, Sajan D, George, Aseefhali, Bankapur, Santhosh, Chidangil, Aditya K, Dharmadhikari, Deepak, Mathur, S, Madan Kumar, K, Byrappa, Abdul Ajees, Abdul Salam   +8 more
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Magnetic nanocluster-mediated photothermal effect and macrophage modulation for synergistic photothermal immunotherapy of cancer

Biomaterials Science, 2022
Magnetic nanoclusters (MNCs) promote tumor regression and inhibit cancer metastasis through an intrinsic photothermal effect synergized with induced macrophage repolarization and T cell modulation.
Xiaoqing Ren, Wanqiong Yuan, Jing Ma, Ping Wang, Suhui Sun, Shumin Wang, Rongsheng Zhao, Xiaolong Liang   +7 more
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Polypyrrole-stabilized gold nanorods with enhanced photothermal effect towards two-photon photothermal therapy

Journal of Materials Chemistry B, 2015
The core–shell composite of Au–polypyrrole nanorods with high two-photon photothermal effect and stability could efficiently kill tumor cells under irradiation.
Cuiling, Du, Anhe, Wang, Jinbo, Fei, Jie, Zhao, Junbai, Li   +4 more
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Unique Photothermal Response and Sustained Photothermal Effect of pH‐Responsive Gold‐Nanoparticle Aggregates

ChemPhysChem, 2012
Hot gold: The photothermal response upon pulsed laser irradiation is studied for pH-responsive gold-nanoparticle aggregates and compared to that of gold nanorods. The aggregates show a slight red shift in the absorption spectrum and retain the photothermal effect, whereas the nanorods lose the photothermal effect and exhibit a stark blue shift in the ...
Nam, J, Nam, H, Jung, S, Hwang, S, Wang, T, Hur, J, Im, K, Park, N, Kim, KH, Kim, S   +9 more
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Temperature effect on photothermal lens phenomena in water: Photothermal defocusing and focusing

Chemical Physics Letters, 1989
Abstract Depending on whether the measurements are performed at temperatures lower or higher than −0.01°C, the photoinduced thermal lens in water can have either positive (converging) or negative (diverging) focal length. At precisely −0.01±0.04°C, no thermal lens signal could be observed.
Mladen Franko, Chieu D. Tran
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Gigahertz photothermal effect in silicon waveguides

Applied Physics Letters, 2008
We present a theoretical and experimental study of the frequency response of the photothermal effect in silicon waveguides. The effect is studied for modulation frequencies up to 3GHz using integrated photonic circuits in Mach–Zehnder and ring oscillator configurations.
W. H. P. Pernice, Mo Li, H. X. Tang
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Adaptive Beam Shaping using Photothermal Effects

Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, 2009
We present an experimental demonstration of adaptive beam shaping via heat induced photothermal effects in optical elements. One application of the proposed system is for correction of astigmatic thermal aberrations in high power laser systems.
Muzammil A. Arain, William Z. Korth, Guido Mueller, D. B. Tanner, D. H. Reitze   +4 more
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Enhanced Photothermal Effect in Si Nanowires

Nano Letters, 2003
Si nanowires synthesized by the thermal evaporation of a silicon monoxide powder or a mixture of silicon and silica powders burned fiercely in air and exhibited a large photoacoustic effect when exposed to a conventional photographic flash. The energy required to ignite the Si nanowires was 0.1−0.2 J/cm2. Si nanowires showed a strong ability to confine
Wang, N., Yao, BD, Chan, YF, Zhang, XY
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