scholarly journals Femtosecond Laser-Induced Self-Assembly of Ce3+-Doped YAG Nanocrystals

Crystals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1142
Author(s):  
Yasuhiko Shimotsuma ◽  
Kotaro Tomura ◽  
Tatsuya Okuno ◽  
Masahiro Shimizu ◽  
Kiyotaka Miura
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Self Assembly ◽  
Three Dimensional ◽  
Photonic Devices ◽  
Femtosecond Laser Irradiation ◽  
Ligand Field ◽  
Femtosecond Pulses ◽  
Periodic Nanostructures ◽  
Partial Crystallization

Direct three-dimensional laser writing of crystallization inside glass has been intensely studied as an attractive technique for fabricating photonic devices. In particular, polarization-dependent periodic nanostructures composed of the partial crystallization in glass can be self-assembled through focused irradiation of femtosecond pulses. Here, we report on the Y3Al5O12 (YAG) crystal precipitation in nanoscale by femtosecond laser irradiation inside Al2O3-Y2O3 glass. Furthermore, we focus on the white emission by Ce: YAG in which a part of Y3+ site was replaced by Ce3+, the effect on photoluminescence (PL) characteristics by changing of ligand field induced by nanostructure formation was observed.

Producing anomalous uniform periodic nanostructures on Cr thin films by femtosecond laser irradiation in vacuum

2020 ◽  
Vol 45 (6) ◽  
pp. 1301
Author(s):  
Fei Wang ◽  
Bo Zhao ◽  
Yuhao Lei ◽  
Jianjun Yang ◽  
Chunlei Guo
Keyword(s):  
Thin Films ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Femtosecond Laser Irradiation ◽  
Periodic Nanostructures

scholarly journals Experimental Investigation Of Nanostructures Generated On Glasses Using A MHz Femtosecond Laser

2021 ◽  
Author(s):  
Dheeraj Vipparty
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Dwell Time ◽  
Three Dimensional ◽  
Soda Lime ◽  
Femtosecond Laser Irradiation ◽  
Soda Lime Glass ◽  
Ambient Conditions ◽  
Nanoparticle Agglomerate ◽  
Insight Into

This dissertation reports the synthesis of unique Si0₂ based nanostructures by exposing glass samples to MHz repletion rate femtosecond laser irradiation. A three-dimensional fibrous nanoparticle agglomerate network was observed on soda-lime glass (73% SiO + other compounds) when exposed to femtosecond laser irradiation at 8.4 MHz and 12.6 MHz repetition rate and 0.5 ms dwell time, in air. By irradiating silica glass (96% SiO₂+ trace elements) sample under ambient conditions with femtosecond pulses at 12.6 MHz and dwell time in excess of 3.0 ms; long continuous nanofibers of extremely high aspect ration (certain fibers up to 100000:1) were obtained. The mechanisms that promote such nanostructures with distinct morphologies have been explored. A deeper insight into the fundamentals of femtosecond laser interaction with dielectrics led to the understanding that variations in bandgap alters ablation dynamics and dictates the response of glass to femtosecond laser irradiation, ultimately resulting in the formation of structures with dissimilar morphology on silica and soda-lime glass.

Biocompatibility of Titanium Dioxide Film Modified by Femtosecond Laser Irradiation

2014 ◽  
Vol 783-786 ◽  
pp. 1377-1382 ◽  
Author(s):  
Masahiro Tsukamoto ◽  
Togo Shinonaga ◽  
Akiko Nagai ◽  
Kimihiro Yamashita ◽  
Takao Hanawa ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Film Surface ◽  
Polarization Vector ◽  
Cell Spreading ◽  
Laser Wavelength ◽  
Femtosecond Laser Irradiation ◽  
Periodic Nanostructures ◽  
Cell Test

Titanium (Ti) is one of the most widely used for biomaterials, because of its excellent anti-corrosion and high mechanical properties. In addion to these properies, the bioactivity of Ti is required. Recently, coating of the titanium dioxide (TiO2) film on Ti plate surface is useful methods to obtain biocompatibility of Ti plate. If periodic nanostructures were formed on the film surface, direction of cell spreading might be controlled due to grooves direction. Then, femtosecond laser is one of the useful tools of periodic nanostructures formation. Peiriod of periodic nanostructures might be varied by changing the laser wavelength. In the experiments, the film was formed on Ti plate with an aerosol beam which was composed of submicron size TiO2 particles and helium gas. The film was irradiated with the femtosecond laser. Laser wavelengths of the laser was at 1044, 775 and 388 nm, respectively. Periodic nanostructures, lying perpendicular to the laser electric field polarization vector, were formed on the film by femtosecond laser irradiation at 1044, 775 and 388 nm, respectively. The period of the periodic nanostructures on the film produced by femtosecond laser irradiation at 1044, 775 and 388 nm was about 350, 230 and 130 nm, respectively. In the cell test, cell spreading along the grooves of the periodic nanostructures was observed although it was not done for the film without the periodic nanostructures. These results suggested that direction of cell spreading could be controlled by the periodic nanostructures formation

scholarly journals Three dimensional microstructuring of biopolymers by femtosecond laser irradiation

2009 ◽  
Vol 95 (26) ◽  
pp. 263703 ◽  
Author(s):  
M. Oujja ◽  
S. Pérez ◽  
E. Fadeeva ◽  
J. Koch ◽  
B. N. Chichkov ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Three Dimensional ◽  
Femtosecond Laser Irradiation

Three-dimensional photoprecipitation of oriented LiNbO_3-like crystals in silica-based glass with femtosecond laser irradiation

2012 ◽  
Vol 37 (14) ◽  
pp. 2955 ◽  
Author(s):  
Chaxing Fan ◽  
Bertrand Poumellec ◽  
Matthieu Lancry ◽  
Xuan He ◽  
Huidan Zeng ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Three Dimensional ◽  
Femtosecond Laser Irradiation

scholarly journals Experimental Investigation Of Nanostructures Generated On Glasses Using A MHz Femtosecond Laser

2021 ◽  
Author(s):  
Dheeraj Vipparty
Keyword(s):  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Dwell Time ◽  
Three Dimensional ◽  
Soda Lime ◽  
Femtosecond Laser Irradiation ◽  
Soda Lime Glass ◽  
Ambient Conditions ◽  
Nanoparticle Agglomerate ◽  
Insight Into

This dissertation reports the synthesis of unique Si0₂ based nanostructures by exposing glass samples to MHz repletion rate femtosecond laser irradiation. A three-dimensional fibrous nanoparticle agglomerate network was observed on soda-lime glass (73% SiO + other compounds) when exposed to femtosecond laser irradiation at 8.4 MHz and 12.6 MHz repetition rate and 0.5 ms dwell time, in air. By irradiating silica glass (96% SiO₂+ trace elements) sample under ambient conditions with femtosecond pulses at 12.6 MHz and dwell time in excess of 3.0 ms; long continuous nanofibers of extremely high aspect ration (certain fibers up to 100000:1) were obtained. The mechanisms that promote such nanostructures with distinct morphologies have been explored. A deeper insight into the fundamentals of femtosecond laser interaction with dielectrics led to the understanding that variations in bandgap alters ablation dynamics and dictates the response of glass to femtosecond laser irradiation, ultimately resulting in the formation of structures with dissimilar morphology on silica and soda-lime glass.

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