scholarly journals Nanoparticles Produced via Laser Ablation of Porous Silicon and Silicon Nanowires for Optical Bioimaging

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4874
Author(s):  
Stanislav V. Zabotnov ◽  
Anastasiia V. Skobelkina ◽  
Ekaterina A. Sergeeva ◽  
Daria A. Kurakina ◽  
Aleksandr V. Khilov ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Properties ◽  
Laser Ablation ◽  
Porous Silicon ◽  
Silicon Nanowires ◽  
Silicon Nanoparticles ◽  
Near Infrared ◽  
Silicon Nanowire ◽  
Optical Coherence ◽  
Efficient Treatment

Modern trends in optical bioimaging require novel nanoproducts combining high image contrast with efficient treatment capabilities. Silicon nanoparticles are a wide class of nanoobjects with tunable optical properties, which has potential as contrasting agents for fluorescence imaging and optical coherence tomography. In this paper we report on developing a novel technique for fabricating silicon nanoparticles by means of picosecond laser ablation of porous silicon films and silicon nanowire arrays in water and ethanol. Structural and optical properties of these particles were studied using scanning electron and atomic force microscopy, Raman scattering, spectrophotometry, fluorescence, and optical coherence tomography measurements. The essential features of the fabricated silicon nanoparticles are sizes smaller than 100 nm and crystalline phase presence. Effective fluorescence and light scattering of the laser-ablated silicon nanoparticles in the visible and near infrared ranges opens new prospects of their employment as contrasting agents in biophotonics, which was confirmed by pilot experiments on optical imaging.

scholarly journals Quantifying optical properties with visible and near-infrared optical coherence tomography to visualize esophageal microwave ablation zones

2018 ◽  
Vol 9 (4) ◽  
pp. 1648 ◽  
Author(s):  
Ryan C. Niemeier ◽  
Sevde Etoz ◽  
Daniel A. Gil ◽  
Melissa C. Skala ◽  
Christopher L. Brace ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Properties ◽  
Microwave Ablation ◽  
Near Infrared ◽  
Optical Coherence

Laser-ablated silicon nanoparticles: optical properties and perspectives in optical coherence tomography

Laser Physics ◽  
2015 ◽  
Vol 25 (7) ◽  
pp. 075604 ◽  
Author(s):  
M Yu Kirillin ◽  
E A Sergeeva ◽  
P D Agrba ◽  
A D Krainov ◽  
A A Ezhov ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Properties ◽  
Silicon Nanoparticles ◽  
Optical Coherence

Pulsed Laser Ablation of Silicon Nanowires in Water and Ethanol

2020 ◽  
Vol 312 ◽  
pp. 200-205
Author(s):  
Stanislav V. Zabotnov ◽  
Anastasiia V. Skobelkina ◽  
Fedor V. Kashaev ◽  
Aleksandr V. Kolchin ◽  
Vladimir V. Popov ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Silicon Nanowires ◽  
Silicon Nanoparticles ◽  
Crystalline Silicon ◽  
Silicon Nanowire ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Nanowire Arrays ◽  
Silicon Nanowire Arrays ◽  
Traditional Approaches

A novel two-stage technique to fabricate silicon nanoparticles is reported. At the first stage, silicon nanowire arrays are formed by metal-assisted chemical etching. At the second stage, the nanoparticles are produced by pulsed laser ablation of the silicon nanowire targets in water and ethanol. The fabricated particles have relatively small mean size in the range of 24 – 45 nm depending on the used buffer liquid. The ablation threshold of the silicon nanowire arrays is 2 – 11 times smaller than that for crystalline silicon targets. Owing to the achieved parameters, the proposed technique is more efficient in comparison with traditional approaches of mechanical milling of silicon nanowires and laser ablation of crystalline silicon. Raman spectroscopy study revealed crystalline structure of the fabricated silicon nanoparticles. The properties of the produced nanoparticles indicate their high potential in biophotonics.

scholarly journals Coherence tomography with broad bandwidth extreme ultraviolet and soft X-ray radiation

2021 ◽  
Vol 127 (4) ◽  
Author(s):  
S. Skruszewicz ◽  
S. Fuchs ◽  
J. J. Abel ◽  
J. Nathanael ◽  
J. Reinhard ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Near Infrared ◽  
Extreme Ultraviolet ◽  
Infrared Light ◽  
Imaging Method ◽  
Optical Coherence ◽  
Axial Resolution ◽  
Cross Sectional ◽  
X Ray ◽  
Broad Bandwidth

AbstractWe present an overview of recent results on optical coherence tomography with the use of extreme ultraviolet and soft X-ray radiation (XCT). XCT is a cross-sectional imaging method that has emerged as a derivative of optical coherence tomography (OCT). In contrast to OCT, which typically uses near-infrared light, XCT utilizes broad bandwidth extreme ultraviolet (XUV) and soft X-ray (SXR) radiation (Fuchs et al in Sci Rep 6:20658, 2016). As in OCT, XCT’s axial resolution only scales with the coherence length of the light source. Thus, an axial resolution down to the nanometer range can be achieved. This is an improvement of up to three orders of magnitude in comparison to OCT. XCT measures the reflected spectrum in a common-path interferometric setup to retrieve the axial structure of nanometer-sized samples. The technique has been demonstrated with broad bandwidth XUV/SXR radiation from synchrotron facilities and recently with compact laboratory-based laser-driven sources. Axial resolutions down to 2.2 nm have been achieved experimentally. XCT has potential applications in three-dimensional imaging of silicon-based semiconductors, lithography masks, and layered structures like XUV mirrors and solar cells.

scholarly journals Gold Nanoprisms as Optical Coherence Tomography Contrast Agents in the Second Near-Infrared Window for Enhanced Angiography in Live Animals

ACS Nano ◽  
2018 ◽  
Vol 12 (12) ◽  
pp. 11986-11994 ◽  
Author(s):  
Peng Si ◽  
Edwin Yuan ◽  
Orly Liba ◽  
Yonatan Winetraub ◽  
Siavash Yousefi ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Contrast Agents ◽  
Near Infrared ◽  
Optical Coherence ◽  
Gold Nanoprisms ◽  
Infrared Window
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