Hollow-waveguide-based nanosecond, near-infrared pulsed laser ablation of tissue

2005 ◽  
Vol 37 (2) ◽  
pp. 149-154 ◽  
Author(s):  
Shunichi Sato ◽  
Yi-Wei Shi ◽  
Yuji Matsuura ◽  
Mitsunobu Miyagi ◽  
Hiroshi Ashida
Keyword(s):  
Laser Ablation ◽  
Near Infrared ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Hollow Waveguide

scholarly journals Tailoring Photoluminescence from Si-Based Nanocrystals Prepared by Pulsed Laser Ablation in He-N2 Gas Mixtures

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 440 ◽  
Author(s):  
Anastasiya A. Fronya ◽  
Sergey V. Antonenko ◽  
Alexander Yu. Kharin ◽  
Andrei V. Muratov ◽  
Yury A. Aleschenko ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Near Infrared ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Gas Mixtures ◽  
Si Nanocrystals ◽  
Silicon Target ◽  
Silicon Suboxide ◽  
Pl Emission ◽  
Excitonic States

Using methods of pulsed laser ablation from a silicon target in helium (He)-nitrogen (N2) gas mixtures maintained at reduced pressures (0.5–5 Torr), we fabricated substrate-supported silicon (Si) nanocrystal-based films exhibiting a strong photoluminescence (PL) emission, which depended on the He/N2 ratio. We show that, in the case of ablation in pure He gas, Si nanocrystals exhibit PL bands centered in the “red - near infrared” (maximum at 760 nm) and “green” (centered at 550 nm) spectral regions, which can be attributed to quantum-confined excitonic states in small Si nanocrystals and to local electronic states in amorphous silicon suboxide (a-SiOx) coating, respectively, while the addition of N2 leads to the generation of an intense “green-yellow” PL band centered at 580 nm. The origin of the latter band is attributed to a radiative recombination in amorphous oxynitride (a-SiNxOy) coating of Si nanocrystals. PL transients of Si nanocrystals with SiOx and a-SiNxOy coatings demonstrate nonexponential decays in the micro- and submicrosecond time scales with rates depending on nitrogen content in the mixture. After milling by ultrasound and dispersing in water, Si nanocrystals can be used as efficient non-toxic markers for bioimaging, while the observed spectral tailoring effect makes possible an adjustment of the PL emission of such markers to a concrete bioimaging task.

scholarly journals Continuous preparation of antimony nanocrystals with near infrared photothermal property by pulsed laser ablation in liquids

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Juanrong Kou ◽  
Yongkai Wang ◽  
Xiaoyu Liu ◽  
Xianju Zhang ◽  
Gaoyu Chen ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Near Infrared ◽  
Thermal Evaporation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Physical Chemical ◽  
Reaction Solution ◽  
Laser Ablation In Liquids ◽  
Continuous Preparation ◽  
Photothermal Property

Abstract Antimony nanocrystals (Sb NCs) are of interest in energy storage, catalysis and cancer therapy for its special physical, chemical and biomedical properties. However, methodology challenges still remain in preparation of colloidal Sb NCs, due to the restricted reaction solution systems, high temperature and time costing for common routes. Herein, size controllable colloidal Sb NCs were continuously prepared by pulsed laser ablation of Sb target in different solvents, owning to the metal nanodroplet explosive ejection and thermal evaporation mechanisms. These well dispersed and stable Sb NCs showed excellent photothermal property in the near-infrared-II window.

scholarly journals Luminescent silicon nanocrystals produced by near-infrared nanosecond pulsed laser ablation in water

2014 ◽  
Vol 302 ◽  
pp. 62-65 ◽  
Author(s):  
L. Vaccaro ◽  
L. Sciortino ◽  
F. Messina ◽  
G. Buscarino ◽  
S. Agnello ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Silicon Nanocrystals ◽  
Near Infrared ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Nanosecond Pulsed Laser

Nanosecond, high-intensity pulsed laser ablation of myocardium tissue at the ultraviolet, visible, and near-infrared wavelengths: In-vitro study

2001 ◽  
Vol 29 (5) ◽  
pp. 464-473 ◽  
Author(s):  
Shunichi Sato ◽  
Makoto Ogura ◽  
Miya Ishihara ◽  
Satoko Kawauchi ◽  
Tsunenori Arai ◽  
...  
Keyword(s):  
Laser Ablation ◽  
High Intensity ◽  
Near Infrared ◽  
Pulsed Laser ◽  
In Vitro Study ◽  
Pulsed Laser Ablation ◽  
Vitro Study ◽  
Infrared Wavelengths

Observations on the growth of YBa2Cu3O7-δ thin films on MgO by pulsed-laser ablation

1991 ◽  
Vol 49 ◽  
pp. 1068-1069
Author(s):  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Ablation ◽  
Substrate Surface ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Laser Ablation Process ◽  
Deposition Parameters

Pulsed-laser ablation has been widely used to produce high-quality thin films of YBa2Cu3O7-δ on a range of substrate materials. The nonequilibrium nature of the process allows congruent deposition of oxides with complex stoichiometrics. In the high power density regime produced by the UV excimer lasers the ablated species includes a mixture of neutral atoms, molecules and ions. All these species play an important role in thin-film deposition. However, changes in the deposition parameters have been shown to affect the microstructure of thin YBa2Cu3O7-δ films. The formation of metastable configurations is possible because at the low substrate temperatures used, only shortrange rearrangement on the substrate surface can occur. The parameters associated directly with the laser ablation process, those determining the nature of the process, e g. thermal or nonthermal volatilization, have been classified as ‘primary parameters'. Other parameters may also affect the microstructure of the thin film. In this paper, the effects of these ‘secondary parameters' on the microstructure of YBa2Cu3O7-δ films will be discussed. Examples of 'secondary parameters' include the substrate temperature and the oxygen partial pressure during deposition.

scholarly journals Doping nanoparticles using pulsed laser ablation in a liquid containing the doping agent

2019 ◽  
Vol 1 (10) ◽  
pp. 3963-3972 ◽  
Author(s):  
Arsène Chemin ◽  
Julien Lam ◽  
Gaétan Laurens ◽  
Florian Trichard ◽  
Vincent Motto-Ros ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Doping Agent ◽  
Laser Ablation In Liquids ◽  
Dope Nanoparticles

While doping is crucial for numerous technological applications, its control remains difficult especially when the material is reduced down to the nanometric scale. We suggest a new way to dope nanoparticles using laser ablation in liquids.

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