scholarly journals Femtosecond Laser-Based Modification of PDMS to Electrically Conductive Silicon Carbide

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 558 ◽  
Author(s):  
Yasutaka Nakajima ◽  
Shuichiro Hayashi ◽  
Akito Katayama ◽  
Nikolay Nedyalkov ◽  
Mitsuhiro Terakawa
Keyword(s):  
Electrical Conductivity ◽  
Silicon Carbide ◽  
Femtosecond Laser ◽  
Scanning Speed ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Mems Devices ◽  
Direct Writing ◽  
X Ray Diffraction ◽  
Electrically Conductive

In this paper, we experimentally demonstrate femtosecond laser direct writing of conductive structures on the surface of native polydimethylsiloxane (PDMS). Irradiation of femtosecond laser pulses modified the PDMS to black structures, which exhibit electrical conductivity. Fourier-transform infrared (FTIR) and X-ray diffraction (XRD) results show that the black structures were composed of β-silicon carbide (β-SiC), which can be attributed to the pyrolysis of the PDMS. The electrical conductivity was exhibited in limited laser power and scanning speed conditions. The technique we present enables the spatially selective formation of β-SiC on the surface of native PDMS only by irradiation of femtosecond laser pulses. Furthermore, this technique has the potential to open a novel route to simply fabricate flexible/stretchable MEMS devices with SiC microstructures.

X-ray diffraction from the ripple structures created by femtosecond laser pulses

2010 ◽  
Vol 100 (1) ◽  
pp. 105-112 ◽  
Author(s):  
A. Jurgilaitis ◽  
R. Nüske ◽  
H. Enquist ◽  
H. Navirian ◽  
P. Sondhauss ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Ray Diffraction ◽  
X Ray

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 ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Femtosecond Laser ◽  
Three Dimensional ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Formation Mechanisms ◽  
Strained Layers ◽  
Tomographic Images ◽  
Scanning Transmission ◽  
Periodic Microstructures

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.

LASER DIRECT WRITING OF LONG PERIOD FIBER GRATING BY 800 NM FEMTOSECOND LASER PULSES

2008 ◽  
Vol 17 (04) ◽  
pp. 425-433 ◽  
Author(s):  
SHUANGCHEN RUAN ◽  
YI HUANG ◽  
CHENLIN DU ◽  
YONGQIN YU
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Transmission Loss ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Direct Writing ◽  
Loss Peak ◽  
Laser Direct Writing ◽  
Time Duration ◽  
Long Period

Femtosecond laser pulses with ultrashort time duration and ultrahigh peak power can cause the refractive index change in transparent materials and micron scale machining precision. Long period fiber gratings (LPFGs) with different periods and different grating lengths in the standard single mode fiber were fabricated, using laser direct writing method, by femtosecond laser pulses with pulse width of 200 fs at a center wavelength of 800 nm in air. The transmission spectra were studied in the range of 1510 nm to 1610 nm. Two LPFGs with period of 400 μm, and 550 μm, respectively fabricated with same irradiation power of 275 mW, were shown. The loss peak of 1552 nm, the transmission loss of 16 dB and the FWHM of 20 nm were obtained when the period of LPFG was 400 μm, while the loss peak of 1588 nm, the transmission loss of 20 dB and the FWHM of 25 nm were achieved when the period of LPFG was 550 μm. According to the theory of mode field coupling for long period grating, it was indicated that the modulation of refractive index Δn was in the level of 10-2.

Silicon carbide nanocrystals produced by femtosecond laser pulses

2018 ◽  
Vol 81 ◽  
pp. 96-102 ◽  
Author(s):  
Sára Tóth ◽  
Péter Németh ◽  
Péter Rácz ◽  
László Himics ◽  
Péter Dombi ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

Rapid Prototyping of Glass Microfluidic Devices using Femtosecond Laser Pulses

2004 ◽  
Vol 820 ◽  
Author(s):  
Myung-Il Park ◽  
Jun Rye Choi ◽  
Mira Park ◽  
Dae Sik Choi ◽  
Sae Chae Jeoung ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Rapid Prototyping ◽  
Laser Fluence ◽  
Femtosecond Laser Ablation ◽  
Microfluidic Devices ◽  
Soda Lime ◽  
Laser Pulses ◽  
Laser Micromachining ◽  
Femtosecond Laser Pulses ◽  
Mems Devices

AbstractLaser micromachining technology with 150 femtosecond pulses is developed to fabricate glass microfluidic devices. A short theoretical analysis of femtosecond laser ablation is reported to characterize the femtosecond laser micromachining. The ablated crater diameter is measured as a function of the number of laser pulses as well as laser fluence. Two different ablation regimes are observed and the transition between the regimes is dependent on both the laser fluence and the number of laser shots. Based on the ablation phenomena described, microfluidic devices are fabricated with commercially available soda lime glasses (76 mm × 26 mm × 1 mm, Knittel Glaser, Germany). In addition to a microchannel for microfluidics, the capillary as well as optical fiber for detecting is integrated on the same substrate. The substrate is successively packaged with a lid slide glass by a thermal direct bonding. The presented developments are suitable for fast turn-around design cycle and inexpensive procedure, which provide rapid prototyping of MEMS devices.

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