scholarly journals Analysis of physical interaction between peroxisomes and chloroplast induced by dynamic morphological changes of peroxisomes using femtosecond laser impulsive force

2016 ◽  
Vol 28 (1) ◽  
pp. 29-34 ◽  
Author(s):  
Kazusato Oikawa ◽  
Shoji Mano ◽  
Yoichiroh Hosokawa ◽  
Mikio Nishimura
Keyword(s):  
Femtosecond Laser ◽  
Morphological Changes ◽  
Physical Interaction ◽  
Impulsive Force

Dynamics and 2D temperature distribution of plasma obtained by femtosecond laser-induced breakdown

2021 ◽  
Author(s):  
Afaque M. Hossain ◽  
Martin Ehrhardt ◽  
Martin Rudolph ◽  
Dmitry V Kalanov ◽  
Pierre Lorenz ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Morphological Changes ◽  
Exponential Dependence ◽  
Morphological Development ◽  
Initial State ◽  
Toroidal Plasma ◽  
Velocity Gradients ◽  
Baroclinic Torque ◽  
Laser Induced Breakdown ◽  
High Pressure Zone

Abstract Recently, plasma produced by focusing femtosecond laser in gases has been introduced as an etching tool in materials processing. Proper control of the plasma in this application necessitates the apt understanding of the different morphological features of the plasma. In this contribution we show that, the plasma produced in air goes through several stages of morphological development – from ellipsoidal to spherical to toroidal plasma, whereas in argon, axial compression of an ellipsoidal plasma is observed. To explain this dissimilarity, we have quantified the temperature by emission spectroscopy (Planck analysis with Wien’s approximation). The evolution of temperature shows a triple exponential dependence in time which can be correlated with different stages of morphological changes of the plasma. Open Source Field Operation and Manipulation (OpenFOAM) simulations using experimentally determined temperature values show that – (i) the reverse pressure gradient propagates radially inwards and compresses the plasma in both air and argon and forms a localized high pressure zone at the center that generates a secondary pressure wave in air, but not in argon, and (ii) the baroclinic torque that is generated because of the Richtmyer-Meshkov instability, dominates the rate of vorticity in air, whereas effects of flow compressibility and velocity gradients dominate the vortices in argon. Knowledge of the initial state and the dynamics of the subsequent stages of the plasma formation can be utilized for control and optimization of laser-induced plasma applications.

Mechanical response of single nerve cells estimated by femtosecond laser-induced impulsive force

2015 ◽  
Author(s):  
Takanori Iino ◽  
Tadahide Furuno ◽  
Man Hagiyama ◽  
Akihiko Ito ◽  
Yoichiroh Hosokawa
Keyword(s):  
Femtosecond Laser ◽  
Mechanical Response ◽  
Nerve Cells ◽  
Impulsive Force ◽  
Single Nerve

Micromachining Characteristics of NiTi Based Shape Memory Alloy Using Femtosecond Laser

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Nitin Uppal ◽  
Panos S. Shiakolas
Keyword(s):  
Shape Memory Alloy ◽  
Femtosecond Laser ◽  
Shape Memory ◽  
Smart Materials ◽  
Morphological Changes ◽  
Wide Spectrum ◽  
Interaction Mechanism ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Niti Shape Memory Alloy

Femtosecond laser micromachining (FLM) is a relatively new and promising technology for the micromachining of a wide spectrum of engineering materials with micron and submicron size features. The interaction mechanism of femtosecond laser pulses with matter is not the same as that found in traditional lasers. This manuscript presents a detailed study of the ablation characteristics of a nickel-titanium (NiTi) shape memory alloy in air with femtosecond laser pulses. The single- and multishot ablation threshold fluence and the incubation coefficient (predicting the extent to which accumulation could take place in a material) are evaluated. In addition, morphological changes, such as the emergence of a ripple pattern, are discussed along with the identification of gentle and strong ablation phases. This study provides for the understanding and characterization of NiTi micromachining using FLM technology, which could aid in the identification of new applications for smart materials in the macro-, nano-, and microelectromechanical system domains using this technology.

Morphological evaluation of cell differentiation after the isolation of single cells by a femtosecond laser-induced impulsive force

2010 ◽  
Vol 13 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Yasuyo Maezawa ◽  
Kazunori Okano ◽  
Mie Matsubara ◽  
Hiroshi Masuhara ◽  
Yoichiroh Hosokawa
Keyword(s):  
Cell Differentiation ◽  
Femtosecond Laser ◽  
Single Cells ◽  
Impulsive Force ◽  
Morphological Evaluation

Nondestructive micropatterning of living animal cells using focused femtosecond laser-induced impulsive force

2007 ◽  
Vol 91 (2) ◽  
pp. 023904 ◽  
Author(s):  
Takahiro Kaji ◽  
Syoji Ito ◽  
Hiroshi Miyasaka ◽  
Yoichiroh Hosokawa ◽  
Hiroshi Masuhara ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Living Animal ◽  
Impulsive Force ◽  
Animal Cells

Experimental Investigation on Femtosecond Laser Ablation of Polycarbonate

2013 ◽  
Vol 652-654 ◽  
pp. 2359-2362
Author(s):  
Li Tao Qi ◽  
Jin Ping Hu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Morphological Changes ◽  
Femtosecond Laser Ablation ◽  
Experimental Investigations ◽  
Scanning Electron

In this paper, experimental investigations on femtosecond laser (pulse duration:164 fs, wavelength:780 nm) micromachining of polycarbonate have been carried out in air. The lateral and vertical machining precision was evaluated by scanning electron microscopy and profilometer. The morphological changes were observed by scanning electron microscopy. The ablation mechanism varied with the laser pulse energy was discussed. The diameter and depth of the ablated crated are influenced by the laser pulse energy and the number of laser pulses. The relation between the diameter and ablation depth of the crater and the key parameters of femtosecond laser is obtained. Femtosecond laser micromachining of polycarbonate have a potential application of the fabrication of polycarbonate-based devices.

Nanoparticle injection to single animal cells using femtosecond laser-induced impulsive force

2008 ◽  
Vol 93 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Atsushi Yamaguchi ◽  
Yoichiroh Hosokawa ◽  
Guillaume Louit ◽  
Tsuyoshi Asahi ◽  
Chisa Shukunami ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Impulsive Force ◽  
Animal Cells ◽  
Single Animal

scholarly journals 2P232 1C1520 Single cell manipulation and stimulation by femtosecond laser-induced impulsive force(The 48th Annual Meeting of the Biophysical Society of Japan)

2010 ◽  
Vol 50 (supplement2) ◽  
pp. S123
Author(s):  
Yoichiroh Hosokawa ◽  
Takanori iino ◽  
Akihiro Hiraoka ◽  
Man Hagiyama ◽  
Tadahide Furuno ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Cell ◽  
Annual Meeting ◽  
Cell Manipulation ◽  
Impulsive Force ◽  
Biophysical Society ◽  
Single Cell Manipulation
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