Multiphoton imaging of corneal tissue with near-infrared femtosecond laser pulses: corneal optical tomography and its use in refractive surgery

2006 ◽  
Author(s):  
Bao-Gui Wang ◽  
Karsten Koenig ◽  
Iris Riemann ◽  
Harald Schubert ◽  
Karl-Juergen Halbhuber
Keyword(s):  
Femtosecond Laser ◽  
Refractive Surgery ◽  
Near Infrared ◽  
Optical Tomography ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Corneal Tissue ◽  
Multiphoton Imaging

scholarly journals Regulating disordered plasmonic nanoparticles into polarization sensitive metasurfaces

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Shulei Li ◽  
Mingcheng Panmai ◽  
Shaolong Tie ◽  
Yi Xu ◽  
Jin Xiang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Metallic Nanoparticles ◽  
Near Infrared ◽  
Optical Memory ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Optical Diffraction ◽  
Plasmonic Nanoparticles ◽  
Direct Laser

Abstract Metasurfaces composed of regularly arranged and deliberately oriented metallic nanoparticles can be employed to manipulate the amplitude, phase and polarization of an incident electromagnetic wave. The metasurfaces operating in the visible to near infrared spectral range rely on the modern fabrication technologies which offer a spatial resolution beyond the optical diffraction limit. Although direct laser writing is an alternative to the fabrication of nanostructures, the achievement of regular nanostructures with deep-subwavelength periods by using this method remains a big challenge. Here, we proposed and demonstrated a novel strategy for regulating disordered plasmonic nanoparticles into nanogratings with deep-subwavelength periods and reshaped nanoparticles by using femtosecond laser pulses. The orientations of the nanogratings depend strongly on the polarization of the femtosecond laser light. Such nanogratings exhibit reflection and polarization control over the reflected light, enabling the realization of polarization sensitive optical memory and color display with high spatial resolution and good chromacity.

scholarly journals Sacrificial-layer free transfer of mammalian cells using near infrared femtosecond laser pulses

PLoS ONE ◽  
2018 ◽  
Vol 13 (5) ◽  
pp. e0195479 ◽  
Author(s):  
Jun Zhang ◽  
Bastian Hartmann ◽  
Julian Siegel ◽  
Gabriele Marchi ◽  
Hauke Clausen-Schaumann ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Mammalian Cells ◽  
Near Infrared ◽  
Sacrificial Layer ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses

scholarly journals Graphene Oxide-Based Silico-Phosphate Composite Films for Optical Limiting of Ultrashort Near-Infrared Laser Pulses

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1638 ◽  
Author(s):  
Adrian Petris ◽  
Ileana Cristina Vasiliu ◽  
Petronela Gheorghe ◽  
Ana Maria Iordache ◽  
Laura Ionel ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Femtosecond Laser ◽  
Near Infrared ◽  
Substrate Surface ◽  
Sol Gel ◽  
Composite Films ◽  
Laser Pulses ◽  
Optical Limiting ◽  
Femtosecond Laser Pulses ◽  
Glassy Matrix

The development of graphene-based materials for optical limiting functionality is an active field of research. Optical limiting for femtosecond laser pulses in the infrared-B (IR-B) (1.4–3 μm) spectral domain has been investigated to a lesser extent than that for nanosecond, picosecond and femtosecond laser pulses at wavelengths up to 1.1 μm. Novel nonlinear optical materials, glassy graphene oxide (GO)-based silico-phosphate composites, were prepared, for the first time to our knowledge, by a convenient and low cost sol-gel method, as described in the paper, using tetraethyl orthosilicate (TEOS), H3PO4 and GO/reduced GO (rGO) as precursors. The characterisation of the GO/rGO silico-phosphate composite films was performed by spectroscopy (Fourier-transform infrared (FTIR), Ultraviolet–Visible-Near Infrared (UV-VIS-NIR) and Raman) and microscopy (atomic force microscopy (AFM) and scanning electron microscopy (SEM)) techniques. H3PO4 was found to reduce the rGO dispersed in the precursor’s solution with the formation of vertically agglomerated rGO sheets, uniformly distributed on the substrate surface. The capability of these novel graphene oxide-based materials for the optical limiting of femtosecond laser pulses at 1550 nm wavelength was demonstrated by intensity-scan experiments. The GO or rGO presence in the film, their concentrations, the composite films glassy matrix, and the film substrate influence the optical limiting performance of these novel materials and are discussed accordingly.

In vivo animal follow-up studies on intrastromal surgery with near-infrared nanojoule femtosecond laser pulses

2005 ◽  
Author(s):  
Baogui Wang ◽  
Iris Riemann ◽  
Karl-Juergen Halbhuber ◽  
Harald Schubert ◽  
Sigrun Kirste ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Near Infrared ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Follow Up Studies

scholarly journals Interaction of near-infrared femtosecond laser pulses with biological materials in water

2014 ◽  
Vol 53 (5) ◽  
pp. 051510
Author(s):  
Sanjay Varma ◽  
Nathan Hagan ◽  
Miquel Antoine ◽  
Joseph Miragliotta ◽  
Plamen Demirev
Keyword(s):  
Femtosecond Laser ◽  
Near Infrared ◽  
Laser Pulses ◽  
Biological Materials ◽  
Femtosecond Laser Pulses

In vitro optical characterization and discrimination of female breast tissue during near infrared femtosecond laser pulses propagation

2001 ◽  
Vol 6 (4) ◽  
pp. 446 ◽  
Author(s):  
G. Zacharakis ◽  
A. Zolindaki ◽  
V. Sakkalis ◽  
G. Filippidis ◽  
T. G. Papazoglou ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Breast Tissue ◽  
Near Infrared ◽  
Laser Pulses ◽  
Optical Characterization ◽  
Femtosecond Laser Pulses ◽  
Female Breast
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