References of "Zheng, X"
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See detailNanostripe length dependence of plasmon-induced material deformations
Valev, V.K.; Libaers, W.; Zywietz, U. et al

in Optics Letters (2013), 38

Following the impact of a single femtosecond light pulse on nickel nanostripes, material deformations—or “nanobumps”—are created. We have studied the dependence of these nanobumps on the length of ... [more ▼]

Following the impact of a single femtosecond light pulse on nickel nanostripes, material deformations—or “nanobumps”—are created. We have studied the dependence of these nanobumps on the length of nanostripes and verified the link with plasmons. More specifically, local electric currents can melt the nanostructures in the hotspots, where hydrodynamic processes give rise to nanobumps. This process is further confirmed by independently simulating local magnetic fields, since these are produced by the same local electric currents. [less ▲]

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See detailRendering dark modes bright by using asymmetric split ring resonators
Jeyaram, Y.; Verellen, N.; Zheng, X. et al

in Optics Express (2013), 21

We have studied both theoretically and experimentally symmetric and asymmetric planar metallic Split Ring Resonators. We demonstrate that introducing structural asymmetry makes it possible to excite ... [more ▼]

We have studied both theoretically and experimentally symmetric and asymmetric planar metallic Split Ring Resonators. We demonstrate that introducing structural asymmetry makes it possible to excite several higher order modes of both even (l = 2) and odd (l = 3, 5) order, which are otherwise inaccessible for a normally incident plane wave in symmetric structures. Experimentally we observe that the even mode resonances of asymmetric resonators have a quality factor 5.8 times higher than the higher order odd resonances. [less ▲]

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See detailVolumetric method of moments and conceptual multilevel building blocks for nanotopologies
Zheng, X.; Valev, V.K.; Verellen, N. et al

in IEEE Photonics Journal (2012), 4(1), 267-282

Based on the relationship between charge dimensionality and singular field behavior, it is proven that in a volumetric description of a volume current carrying topology, half rooftops of different binary ... [more ▼]

Based on the relationship between charge dimensionality and singular field behavior, it is proven that in a volumetric description of a volume current carrying topology, half rooftops of different binary hierarchical level are allowed without introducing numerical difficulties. This opens the possibility to use a very efficient multi-level hierarchical meshing scheme in a Volumetric Method of Moments (MoM) algorithm. The new meshing scheme is validated by numerical calculations and experiments. It paves the way towards a much more efficient use of MoM in the description of arbitrarily shaped nano-structures at IR and optical frequencies. [less ▲]

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See detailPlasmon-Enhanced Sub-Wavelength Laser Ablation: Plasmonic Nanojets
Valev, V.K.; Denkova, D.; Zheng, X. et al

in Advanced Materials (2012), 24

Plasmonic hotspots are regions on the surface of metal nanostructures where light causes very strong oscillation of the electrons. Because electron oscillations constitute an electric current and because ... [more ▼]

Plasmonic hotspots are regions on the surface of metal nanostructures where light causes very strong oscillation of the electrons. Because electron oscillations constitute an electric current and because electric currents heat up the material the same way an electric stove heats up in the kitchen, the plasmonic hotspots are extremely hot. So hot that they can melt the gold in a spot much smaller than the wavelength of light. We were successfully able to demonstrate that this tiny little pool of molten gold can give rise to the smallest nanojets ever observed. [less ▲]

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See detailDistributing the Optical Near-Field for Efficient Field-Enhancements in Nanostructures
Valev, V; De Clercq, B; Biris, C et al

in Advanced Materials (2012), 24

Circularly polarized light imparts a sense of rotation on the electron density in ring-shaped gold nanostructures. As a consequence, the near-field enhancement becomes homogeneous on the surface of the ... [more ▼]

Circularly polarized light imparts a sense of rotation on the electron density in ring-shaped gold nanostructures. As a consequence, the near-field enhancement becomes homogeneous on the surface of the nanostructures, thereby increasing the opportunity for interaction with molecules. This type of nanostructured samples can find a broad range of applications in chemical processes where the interaction between molecules and local field enhancements play an important role. [less ▲]

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See detailRobustness of the scanning second harmonic generation microscopy technique for characterization of hotspot patterns in plasmonic nanomaterials
Valev, VK; De Clercq, B; Zheng, X et al

in Proceedings of SPIE (2012), 8424

Scanning second harmonic generation (SHG) microscopy is becoming an important tool for characterizing nanopatterned metal surfaces and mapping plasmonic local field enhancements. Here we study G-shaped ... [more ▼]

Scanning second harmonic generation (SHG) microscopy is becoming an important tool for characterizing nanopatterned metal surfaces and mapping plasmonic local field enhancements. Here we study G-shaped and mirror-G-shaped gold nanostructures and test the robustness of the experimental results versus the direction of scanning, the numerical aperture of the objective, the magnification, and the size of the laser spot on the sample. We find that none of these parameters has a significant influence on the experimental results. [less ▲]

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See detailThe role of chiral local field enhancements below the resolution limit of Second Harmonic Generation microscopy
Valev, V.; Clercq, B.; Zheng, X. et al

in Optics Express (2011), 20(1), 256

While it has been demonstrated that, above its resolution limit, Second Harmonic Generation (SHG) microscopy can map chiral local field enhancements, below that limit, structural defects were found to ... [more ▼]

While it has been demonstrated that, above its resolution limit, Second Harmonic Generation (SHG) microscopy can map chiral local field enhancements, below that limit, structural defects were found to play a major role. Here we show that, even below the resolution limit, the contributions from chiral local field enhancements to the SHG signal can dominate over those by structural defects. We report highly homogeneous SHG micrographs of star-shaped gold nanostructures, where the SHG circular dichroism effect is clearly visible from virtually every single nanostructure. Most likely, size and geometry determine the dominant contributions to the SHG signal in nanostructured systems. [less ▲]

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See detailHotspot Decorations Map Plasmonic Patterns with the Resolution of Scanning Probe Techniques
Valev, V. K.; Silhanek, Alejandro ULg; Jeyaram, Y. et al

in Physical Review Letters (2011), 106(22),

In high definition mapping of the plasmonic patterns on the surfaces of nanostructures, the diffraction limit of light remains an important obstacle. Here we demonstrate that this diffraction limit can be ... [more ▼]

In high definition mapping of the plasmonic patterns on the surfaces of nanostructures, the diffraction limit of light remains an important obstacle. Here we demonstrate that this diffraction limit can be completely circumvented. We show that upon illuminating nanostructures made of nickel and palladium, the resulting surface-plasmon pattern is imprinted on the structures themselves; the hotspots (regions of local field enhancement) are decorated with overgrowths, allowing for their subsequent imaging with scanning-probe techniques. The resulting resolution of plasmon pattern imaging is correspondingly improved. [less ▲]

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See detailNimesulide, a novel NSAID of the sulfonanilide class, inhibits PGE2 production by human chondrocytes without affecting proteoglycans synthesis
Henrotin, Yves ULg; Famaey, JP; Labasse, A et al

in Rheumatology in Europe (1997), 26(S2), 170

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See detailModulation of chondrocyte cytokines synthesis by endogeneously produced nitric oxide
Henrotin, Yves ULg; Zheng, X; Deby, G et al

in Rheumatology in Europe (1997), 26(S2), 83

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See detailModulation of chondrocyte cytokines synthesis by endogeneously produced nitric oxide
Henrotin, Yves ULg; Zheng, X; Deby, G et al

in Revue du Rhumatisme (English ed.) (1997), 11

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See detailIn vitro study on the effects of aceclofenac on proteoglycan and type II collagen production by human chondrocytes
Henrotin, Yves ULg; Labasse, A; Degroote, D et al

in Osteoarthritis and Cartilage (1997), 5

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See detailS12911, a new divalent strontium salt increases cartilage matrix formation
Henrotin, Yves ULg; Labasse, A; Zheng, X et al

in Osteoarthritis and Cartilage (1997), 5

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See detailIGF-1 but not IL-1bêta effects on the proteoglycan production by chondrocytes are regulated by strontium salts
Henrotin, Yves ULg; Labasse, A; Zheng, X et al

in Osteoarthritis and Cartilage (1997), 5

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See detailIn vitro effects of aceclofenac on cytokines (IL-6, IL-8, LIF) and PGE2 production by human chondrocytes
Henrotin, Yves ULg; Labasse, A; Degroote, D et al

in Osteoarthritis and Cartilage (1997), 5

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See detailRégulation de la synthèse de cytokines pro-inflammatoires par l’oxyde nitrique (NO)
Henrotin, Yves ULg; Zheng, X; Deby, G et al

in Revue du Rhumatisme (1997), 64(11), 763

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See detailDirect stimulations of cytokines (IL1-Beta, IL2, IL6, TNF-Alpha, IFN-Gamma, GM-CSF, LIF) in whole blood. Differences between normal and osteoporotic postmenopausal women.
Zheng, X; Vrindts, Y; de Groote, D et al

in Journal of Bone and Mineral Research (1994), 9(S1), 322

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