Formation of Nanovoids in Femtosecond Laser-Irradiated Single Crystals of Silicon Carbide

2012 ◽  
Vol 725 ◽  
pp. 19-22 ◽  
Author(s):  
Tatsuya Okada ◽  
Takuro Tomita ◽  
Shigeki Matsuo ◽  
Shuichi Hashimoto ◽  
Ryota Kashino ◽  
...  

Scanning transmission electron microscopy was carried out to study the three-dimensional microstructures of periodic strained layers induced by the irradiation of femtosecond laser pulses inside a silicon carbide single crystal. The cross section of laser-irradiated line consisted of a shell-shaped modified region surrounding a core region with no modification. The laser-modified region was composed of strained layers with a typical spacing of 200 nm. Nanovoids from 10 nm to 20 nm in diameter were observed. Three-dimensional tomographic images clearly show the plate-like shape of strained layers extending parallel to the electric field of the laser light and the random distribution of nanovoids in the strained layers. The three-dimensional observation provides insight into the formation mechanisms of periodic microstructures.

Author(s):  
Siniša Vukelić ◽  
Panjawat Kongsuwan ◽  
Y. Lawrence Yao

Nonlinear absorption of femtosecond-laser pulses enables the induction of structural changes in the interior of bulk transparent materials without affecting their surface. This property can be exploited for transmission welding of transparent dielectrics, three dimensional optical data storages, and waveguides. In the present study, femtosecond-laser pulses were tightly focused within the interior of bulk fused silica specimen. Localized plasma was formed, initiating rearrangement of the network structure. Features were generated through employment of single pulses as well as pulse trains using various processing conditions. The change in material properties were studied through employment of differential interference contrast optical microscopy and atomic force microscopy. The morphology of the altered material as well as the nature of the physical mechanisms (thermal, explosive plasma expansion, or in-between) responsible for the alteration of material properties as a function of process parameters is discussed.


2010 ◽  
Vol 18 (10) ◽  
pp. 10209 ◽  
Author(s):  
Mangirdas Malinauskas ◽  
Albertas Žukauskas ◽  
Gabija Bičkauskaitė ◽  
Roaldas Gadonas ◽  
Saulius Juodkazis

2004 ◽  
Vol 53 (2) ◽  
pp. 436
Author(s):  
Cheng Guang-Hua ◽  
Wang Yi-Shan ◽  
Liu Qin ◽  
Zhao Wei ◽  
Chen Guo-Fu

2019 ◽  
Vol 39 (1) ◽  
pp. 0126012
Author(s):  
乔玲玲 Qiao Lingling ◽  
储蔚 Chu Wei ◽  
王哲 Wang Zhe ◽  
程亚 Cheng Ya

1998 ◽  
Vol 37 (Part 2, No. 1A/B) ◽  
pp. L94-L96 ◽  
Author(s):  
Yuki Kondo ◽  
Toshio Suzuki ◽  
Hideyuki Inouye ◽  
Kiyotaka Miura ◽  
Tsuneo Mitsuyu ◽  
...  

2001 ◽  
Vol 26 (23) ◽  
pp. 1912 ◽  
Author(s):  
Yan Li ◽  
Kazuyoshi Itoh ◽  
Wataru Watanabe ◽  
Kazuhiro Yamada ◽  
Daisuke Kuroda ◽  
...  

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