Mr. Maarten K. Vanbel Profile

Maarten K. Vanbel

at KU Leuven

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Publications (7)

Proceedings Article | 7 October 2014 Paper

Large optical second harmonic generation in a low-bandgap polymer

Maarten Vanbel, Stefaan Vandendriessche, Pieter Willot, Guy Koeckelberghs, Thierry Verbiest

Proceedings Volume 9181, 91810D (2014) https://doi.org/10.1117/12.2060189

KEYWORDS: Polymers, Second-harmonic generation, Harmonic generation, Polarizability, Absorption, Coronagraphy, Molecules, Polarization, Nonlinear optics, Photons

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Proceedings Article | 8 May 2014 Paper

Second-harmonic generation microscopy of collagen-bearing structures

Maarten Vanbel, Tom Callewaert, Thierry Verbiest

Proceedings Volume 9129, 912910 (2014) https://doi.org/10.1117/12.2051648

KEYWORDS: Second-harmonic generation, Collagen, Signal detection, Nonlinear optics, Microscopy, Polarization, Absorption, Visualization, Multiphoton fluorescence microscopy, Luminescence

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Nonlinear optical phenomena cover a broad research area. The emphasis is mostly on the generation of higher harmonics to be used in laser designs or on the characterization capabilities of nonlinear optics. The latter ability of nonlinear optics is important when combined with a microscope to detect simultaneously multiphoton fluorescence and second-harmonic generation. Submicron size features can then be investigated separately and information on their structure can be revealed by second-harmonic generation. For example, the point group symmetry can be determined in situ and in vivo in complex media. Moreover, nonlinear optical microscopy has several additional advantages: the generation and detection of nonlinear signals is intrinsically confocal and degradation, if present, only occurs at a localized places in the structure. In biological structures, multiphoton fluorescence and second-harmonic generation do not necessarily occur in the same type of the structure. This can be exploited to visualize different structures in one sample by simultaneous detection of two-photon fluorescence and second-harmonic generation. Also, the incident beam can be tuned to fit in the biological window of biological structures, which gives second-harmonic generation microscopy a significant advantage over linear microscopy due to absorbance issues in the visible wavelength range. We exploit these advantages to characterize collagen-bearing biological structures. Collagen is the dominant structural protein in connective tissue in mammals. Being the most abundant protein in the mammal clade, it is essential for the very existence of it. Collagen is a protein with a very strict quaternary structure. The most simple Ramachandran model states that an amino-acid sequence of Glycine-prolin-hydroxyprolin leads to a right-handed helical structure. The inherent stability is such that a sole helix cannot exist for a prolonged period of time, it will therefore combine with 2 near identical helices, resulting in the formation of the superhelical structure tropocollagen. Subsequently tropocollagen will align in a linear direction forming the fibers composing collagen-tissue. Due to the superhelical nature of collagen, this structure is ideal to be probed by second-harmonic generation.

Proceedings Article | 8 May 2014 Paper

Sensorless adaptive optics and the effect of field of view in biological second harmonic generation microscopy

Stefaan Vandendriessche, Maarten Vanbel, Thierry Verbiest

Proceedings Volume 9129, 91290Y (2014) https://doi.org/10.1117/12.2051612

KEYWORDS: Image quality, Spatial light modulators, Adaptive optics, Microscopes, Wavefronts, Sensors, Microscopy, Zernike polynomials, Harmonic generation, Second-harmonic generation

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Proceedings Article | 15 March 2013 Paper

Second-harmonic generation from complex chiral samples

M. Vanbel, S. Vandendriessche, M. van der Veen, D. Slavov, P. Heister, R. Paesen, V. Valev, M. Ameloot, T. Verbiest

Proceedings Volume 8770, 87701F (2013) https://doi.org/10.1117/12.2014745

KEYWORDS: Second-harmonic generation, Microscopy, Crystals, Polarization, Statistical analysis, Plasmonics, Crystallography, Imaging systems, Microscopes, Stars

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Proceedings Article | 15 October 2012 Paper

An all-optical protocol to determine the molecular origin of radiation damage/enhancement in electro-optic polymeric materials

Javier Pérez-Moreno, Stijn Van Cleuvenbergen, Maarten Vanbel, Koen Clays, Edward Taylor

Proceedings Volume 8519, 85190C (2012) https://doi.org/10.1117/12.929297

KEYWORDS: Polymers, Electro optic polymers, Chromophores, Polymer thin films, Gamma radiation, Electro optics, Absorption, Modulators, Thin films, Glasses

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Proceedings Article | 11 October 2012 Paper

SHG/2PF microscopy of single and multi-layer graphene

Alexander Klekachev, Inge Asselberghs, Cedric Huyghebaert, Maarten Vanbel, Monique Van der Veen, André Stesmans, Marc Heyns, Stefan De Gendt, Thierry Verbiest

Proceedings Volume 8474, 847405 (2012) https://doi.org/10.1117/12.929992

KEYWORDS: Graphene, Second-harmonic generation, Chemical vapor deposition, Raman spectroscopy, Luminescence, Copper, Polymethylmethacrylate, Glasses, Polarization, Microscopy

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Proceedings Article | 11 May 2012 Paper

Second-harmonic generation as characterization tool for Ge/high-k dielectric interfaces

Maarten Vanbel, Annelies Delabie, Sonja Sioncke, Christoph Adelmann, Valeri Afanas'ev, Jean-Pierre Locquet, Sven Van Elshocht, Matty Caymax, Thierry Verbiest

Proceedings Volume 8434, 84341F (2012) https://doi.org/10.1117/12.921858

KEYWORDS: Second-harmonic generation, Interfaces, Oxides, Semiconductors, Germanium, Transistors, Silicon, Dielectrics, Molybdenum, Sulfur

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Showing 5 of 7 publications

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