Generation of complicated or duplicated structure by interfering femtosecond laser processing of metallic thin film

2011 ◽  
Author(s):  
T. Hiromoto ◽  
K. Momoo ◽  
Y. Nakata ◽  
N. Miyanaga
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Femtosecond Laser Processing ◽  
Metallic Thin Film

Interfering Ultraviolet Femtosecond Laser Processing of Gold Thin Film and Prospect of Shortest Period

2012 ◽  
Vol 5 (10) ◽  
pp. 102703 ◽  
Author(s):  
Yoshiki Nakata ◽  
Keiichi Murakawa ◽  
Noriaki Miyanaga ◽  
Kazuma Momoo
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Gold Thin Film ◽  
Femtosecond Laser Processing

femtosecond laser processing for a thin film coated transparent target

2019 ◽  
Vol 2019.13 (0) ◽  
pp. B12
Author(s):  
Yuki HIROTSU ◽  
Terutake HAYASHI ◽  
Syuhei KUROKAWA ◽  
Ryosuke MIZUMACHI ◽  
Noboru HASEGAWA ◽  
...  
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Femtosecond Laser Processing

Femtosecond Laser-Induced Surface Texturing and Crystallization of a-Si:H Thin Film

2010 ◽  
Author(s):  
Hongliang Wang ◽  
Panjawat Kongsuwan ◽  
Gen Satoh ◽  
Y. Lawrence Yao
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Light Trapping ◽  
Surface Texturing ◽  
Surface Geometry ◽  
Femtosecond Laser Processing ◽  
Stability Issues ◽  
Surface Morphologies

Hydrogenated amorphous silicon (a-Si:H) thin films have been considered for use in solar cell applications because of their significantly reduced cost, however, the overall efficiency and stability are less than that of their bulk crystalline counterparts. Limited work has been performed on solving the efficiency and stability issues of a-Si:H simultaneously. In this study, both surface texturing and crystallization on a-Si:H thin film are achieved through one-step femtosecond laser processing in water. Light absorption is enhanced by light trapping based on surface geometry changes, and the formation of a mixture of hydrogenated microcrystalline silicon (μc-Si:H) and a-Si:H after crystallization suggests that the overall stability may be increased. Furthermore, the formation mechanism for the surface spikes is discussed. A comparison of absorptance spectra for various surface morphologies and crystallinities shows that the combination of surface texturing and crystallization induced by femtosecond laser processing is very promising for a-Si:H thin film solar cell applications.

Study on femtosecond laser processing with photo excitation for a thin film coated transparent target

2019 ◽  
Vol 2019.72 (0) ◽  
pp. C41
Author(s):  
Yuki HIROTSU ◽  
Terutake HAYASHI ◽  
Syuhei KUROKAWA ◽  
Ryosuke MIZUMACHI
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Femtosecond Laser Processing

Generation of New Nanomaterials by Interfering Femtosecond Laser Processing

2004 ◽  
Vol 850 ◽  
Author(s):  
Yoshiki Nakata ◽  
Okada Tatsuo
Keyword(s):  
Thin Film ◽  
Femtosecond Laser ◽  
Laser Fluence ◽  
Laser Processing ◽  
The Other ◽  
Laser Beams ◽  
Nanohole Array ◽  
Silica Substrate ◽  
Femtosecond Laser Processing ◽  
Layered Thin Film

ABSTRACTNew nanomaterials such as nanobump array, nanomesh, nanobelt were generated from thin film processed by interfering femtosecond laser beams. Metallic single- or multi-layered film deposited on a silica substrate was used as a raw thin film. With four interfering femtosecond laser beams, a conical nanobump arrayed in a matrix was generated with single laser shot. As the femtosecond laser fluence increased, the nanobump increased in diameter and height, and a bead was found at the top. Moreover, with three or two interfering femtosecond laser beams, ellipsoidal or linear nanobump array was generated. As an application of a conical nanobump array, field emission from the nanobump array was demonstrated, and the I-V characteristics were measured. On the other hand, with much higher fluence and four interfering femtosecond laser beams, a nanohole array was generated. A nanomesh was also generated from the nanohole array by exfoliating the film. A grating was generated with two interfering femtosecond laser beams, and nanobelts were generated from the grating by exfoliating. Bimetallic nanobelt was also generated from multi-layered thin film.

Femtosecond Laser-Induced Simultaneous Surface Texturing and Crystallization of a-Si:H Thin Film: Absorption and Crystallinity

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Hongliang Wang ◽  
Panjawat Kongsuwan ◽  
Gen Satoh ◽  
Y. Lawrence Yao
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Surface Texturing ◽  
Solar Spectrum ◽  
Nanocrystalline Silicon ◽  
Femtosecond Laser Irradiation ◽  
Surface Geometry ◽  
Femtosecond Laser Processing

Hydrogenated amorphous silicon (a-Si:H) thin films have been considered for use in solar cell applications because of their significantly reduced cost. Their overall efficiency and stability, however, are less than that of their bulk crystalline counterparts. Limited work has been performed on solving the efficiency and stability issues of a-Si:H simultaneously. In this study, both surface texturing and crystallization on a-Si:H thin film are achieved through one-step femtosecond laser processing. The nanoscale conical and pillar-shaped spikes formed on the surface of a-Si:H films by femtosecond laser irradiation in both air and water are presented and enhanced light absorption is observed due to light trapping based on surface geometry changes, while the formation of a mixture of hydrogenated nanocrystalline silicon (nc-Si:H) and a-Si:H after crystallization suggests that the overall material stability can potentially be increased. The relationship among crystallinity, fluence, and scan speed is also discussed. Furthermore, a comparison of absorptance spectra for various surface morphologies is developed. Finally, the absorptance measurement across the solar spectrum shows that the combination of surface texturing and crystallization induced by femtosecond laser processing is very promising for a-Si:H thin film solar cell applications.

Interferometric femtosecond laser processing for nanostructuring inside thin film

2014 ◽  
Vol 3 (5-6) ◽  
Author(s):  
Stephen Ho ◽  
Kitty Kumar ◽  
Kenneth K.C. Lee ◽  
Jianzhao Li ◽  
Peter R. Herman
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Dielectric Films ◽  
Femtosecond Laser Processing ◽  
Transparent Dielectric ◽  
Laser Interactions

AbstractFemtosecond laser interactions inside transparent dielectric films of refractive index,

scholarly journals Nonlinear refractive index of porcine cornea studied by z-scan and self-focusing during femtosecond laser processing

2010 ◽  
Vol 18 (4) ◽  
pp. 3700 ◽  
Author(s):  
M. Miclea ◽  
U. Skrzypczak ◽  
S. Faust ◽  
F. Fankhauser ◽  
H. Graener ◽  
...  
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Nonlinear Refractive Index ◽  
Laser Processing ◽  
Self Focusing ◽  
Femtosecond Laser Processing ◽  
Porcine Cornea
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