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Rossi G, Brain E, Dueck A, De Swert H, Marreaud S, Partridge A, Herold C, Vachon H, Spanic T, Arahmani A, Verbiest T, Wang L, Goulioti T, Malanda B, Carey L, Anneheim S, Paux G, Poncet C, Metzger O, Cameron D. 90TiP Adjuvant study of amcenestrant (SAR439859) versus tamoxifen for patients with hormone receptor-positive (HR+) early breast cancer (EBC), who have discontinued adjuvant aromatase inhibitor therapy due to treatment-related toxicity (AMEERA-6). Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.03.105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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2
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Bilad MR, Baten M, Pollet A, Courtin C, Wouters J, Verbiest T, J. Vankelecom IF. A novel In-situ Enzymatic Cleaning Method for Reducing Membrane Fouling in Membrane Bioreactors (MBRs). IJOST 2016. [DOI: 10.17509/ijost.v1i1.2211] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
A novel in-situ enzymatic cleaning method was developed for fouling control in membrane bioreactors (MBRs). It is achieved by bringing the required enzymes near the membrane surface by pulling the enzymes to a magnetic membrane (MM) surface by means of magnetic forces, exactly where the cleaning is required. To achieve this, the enzyme was coupled to a magnetic nanoparticle (MNP) and the membrane it self was loaded with MNP. The magnetic activity was turned by means of an external permanent magnet. The effectiveness of concept was tested in a submerged membrane filtration using the model enzyme-substrate of Bacillus subitilis xylanase-arabinoxylan. The MM had almost similar properties compared to the unloaded ones, except for its well distributed MNPs. The enzyme was stable during coupling conditions and the presence of coupling could be detected using a high-performance anion-exchange chromatography (HPAEC) analysis and Fourier transform infrared spectroscopy (FTIR). The system facilitated an in-situ enzymatic cleaning and could be effectively applied for control fouling in membrane bioreactors (MBRs).
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3
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Bloemen M, Vanpraet L, Ceulemans M, Parac-Vogt TN, Clays K, Geukens N, Gils A, Verbiest T. Selective protein purification by PEG–IDA-functionalized iron oxide nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra11614g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new heterobifunctional PEG ligand was developed for efficient magnetic purification of His-tagged proteins.
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Affiliation(s)
- M. Bloemen
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | - L. Vanpraet
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | - M. Ceulemans
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | | | - K. Clays
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
| | - N. Geukens
- PharmAbs
- The KU Leuven Antibody Center
- KU Leuven
- 3000 Leuven
- Belgium
| | - A. Gils
- KU Leuven
- Department of Pharmaceutical and Pharmacological Sciences
- 3000 Leuven
- Belgium
| | - T. Verbiest
- KU Leuven
- Department of Chemistry
- 3001 Heverlee
- Belgium
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4
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Valev VK, Baumberg JJ, De Clercq B, Braz N, Zheng X, Osley EJ, Vandendriessche S, Hojeij M, Blejean C, Mertens J, Biris CG, Volskiy V, Ameloot M, Ekinci Y, Vandenbosch GAE, Warburton PA, Moshchalkov VV, Panoiu NC, Verbiest T. Nonlinear superchiral meta-surfaces: tuning chirality and disentangling non-reciprocity at the nanoscale. Adv Mater 2014; 26:4074-81. [PMID: 24740481 PMCID: PMC4173128 DOI: 10.1002/adma.201401021] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Indexed: 05/27/2023]
Abstract
Circularly polarized light is incident on a nanostructured chiral meta-surface. In the nanostructured unit cells whose chirality matches that of light, superchiral light is forming and strong optical second harmonic generation can be observed.
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Affiliation(s)
- V K Valev
- NanoPhotonics Centre, Cavendish Laboratory Department of Physics University of CambridgeJ. J. Thomson Avenue Cambridge CB3 0HE, UK E-mail:
| | - J J Baumberg
- NanoPhotonics Centre, Cavendish Laboratory Department of Physics University of CambridgeJ. J. Thomson Avenue Cambridge CB3 0HE, UK E-mail:
| | - B De Clercq
- University Hasselt and transnational University LimburgBIOMED, Diepenbeek, Belgium
| | - N Braz
- Electrical Engineering University College London Torrington PlaceLondon WC1E 7JE, UK
| | - X Zheng
- ESAT-TELEMIC, KU LeuvenB-3001, Leuven, Belgium
| | - E J Osley
- Electrical Engineering University College London Torrington PlaceLondon WC1E 7JEUK London Centre for Nanotechnology University College London17–19 Gordon St, London WC1H 0AH, UK
| | | | - M Hojeij
- Laboratory for Micro and Nanotechnology Paul Scherrer Institute5232, Villigen-PS, Switzerland
| | - C Blejean
- NanoPhotonics Centre, Cavendish Laboratory Department of Physics University of CambridgeJ. J. Thomson Avenue Cambridge CB3 0HE, UK E-mail:
| | - J Mertens
- NanoPhotonics Centre, Cavendish Laboratory Department of Physics University of CambridgeJ. J. Thomson Avenue Cambridge CB3 0HE, UK E-mail:
| | - C G Biris
- Department of Physics West University of Timisoara B-dul Vasile ParvanNr. 4, Timisoara, 300223, Timis, Romania
| | - V Volskiy
- ESAT-TELEMIC, KU LeuvenB-3001, Leuven, Belgium
| | - M Ameloot
- University Hasselt and transnational University LimburgBIOMED, Diepenbeek, Belgium
| | - Y Ekinci
- Laboratory for Micro and Nanotechnology Paul Scherrer Institute5232, Villigen-PS, Switzerland
| | | | - P A Warburton
- Electrical Engineering University College London Torrington PlaceLondon WC1E 7JEUK London Centre for Nanotechnology University College London17–19 Gordon St, London WC1H 0AH, UK
| | - V V Moshchalkov
- Nanoscale Superconductivity and Magnetism & Pulsed Fields Group INPAC, KU LeuvenCelestijnenlaan 200 D B-3001, Leuven, Belgium
| | - N C Panoiu
- Electrical Engineering, University College London Torrington PlaceLondon WC1E 7JE, UKThomas Young Centre London Centre for Nanotechnology University College London17–19 Gordon St, London, WC1H 0AH, UK
| | - T Verbiest
- Molecular Electronics and PhotonicsKU Leuven BE-3001, Belgium
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5
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Deckers S, Vandendriessche S, Cornelis D, Monnaie F, Koeckelberghs G, Asselberghs I, Verbiest T, van der Veen MA. Poly(3-alkylthiophene)s show unexpected second-order nonlinear optical response. Chem Commun (Camb) 2014; 50:2741-3. [DOI: 10.1039/c3cc48099b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Poly(3-hexylthiophene)s show upon oligomerization an unexpectedly significant second-order nonlinear optical response.
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Affiliation(s)
- S. Deckers
- Laboratory for Molecular Electronics and Photonics
- University of Leuven
- 3001 Leuven, Belgium
| | - S. Vandendriessche
- Laboratory for Molecular Electronics and Photonics
- University of Leuven
- 3001 Leuven, Belgium
| | - D. Cornelis
- Laboratory for Polymer Synthesis
- University of Leuven
- 3001 Leuven, Belgium
| | - F. Monnaie
- Laboratory for Polymer Synthesis
- University of Leuven
- 3001 Leuven, Belgium
| | - G. Koeckelberghs
- Laboratory for Polymer Synthesis
- University of Leuven
- 3001 Leuven, Belgium
| | | | - T. Verbiest
- Laboratory for Molecular Electronics and Photonics
- University of Leuven
- 3001 Leuven, Belgium
| | - M. A. van der Veen
- Catalysis Engineering
- Chemical Engineering Department
- Delft University of Technology
- , The Netherlands
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6
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Zhu J, Van de Ven W, Verbiest T, Koeckelberghs G, Chen C, Cui Y, Vermorken A. Polyphenols Can Inhibit Furin In Vitro As A Result of the Reactivity of their Auto-oxidation Products to Proteins. Curr Med Chem 2013. [DOI: 10.2174/092986713805076702] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Zhu J, Van de Ven W, Verbiest T, Koeckelberghs G, Chen C, Cui Y, Vermorken A. Polyphenols Can Inhibit Furin In Vitro As A Result of the Reactivity of their Auto-oxidation Products to Proteins. Curr Med Chem 2013. [DOI: 10.2174/0929867311320060009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Zhu J, Van de Ven WJM, Verbiest T, Koeckelberghs G, Chen C, Cui Y, Vermorken AJM. Polyphenols can inhibit furin in vitro as a result of the reactivity of their auto-oxidation products to proteins. Curr Med Chem 2013; 20:840-850. [PMID: 23231348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 11/29/2012] [Accepted: 12/06/2012] [Indexed: 06/01/2023]
Abstract
UNLABELLED Methods using fluorogenic peptide substrates have been proposed for screening of proprotein convertase (PC) inhibitors and they are attractive since they offer the advantage of being sensitive, cost-effective and susceptible to miniaturization. Several polyphenols, including epigallocatechin gallate ((-)EGCG), the main component of green tea, and quercetin, widely distributed in fruit and vegetables, however, led to false positive results when fluorogenic peptide substrates were used. Processing of genuine furin substrates was not inhibited by these polyphenols. In the present study, these discordant effects of (-)EGCG on the PC furin were studied. While quercetin can form aggregates in solution, aggregate-based promiscuous inhibition could be ruled out as underlying mechanism for (-)EGCG. Hydrogen peroxide production, from auto-oxidation, was too low to be a major factor but appeared associated to furin inhibition, suggesting a role for other auto-oxidation products. Since the instability of catechins is related to their electrophilic character, we tested the nucleophilic substance glutathione for stabilization. Indeed glutathione reduced furin inhibition and (-)EGCG binding to furin and serum albumin as shown by redox-cycling staining. Catechins, therefore, seem to form reactive compounds and this should be taken into account in screening assays. Adding glutathione to the detergent-based assay, as used in these studies to measure furin processing activity, strongly reduced inhibition by a number of polyphenols (catechins, gallic acid and quercetin), while the effect on the genuine inhibitor nona-D-arginine remained unchanged. IN CONCLUSION the combined use of detergent and glutathione in the screening assay for furin inhibitors improves the predictive value.
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Affiliation(s)
- J Zhu
- Laboratory for Molecular Oncology, Department for Human Genetics, University of Leuven, Herestraat 49, box 602, B-3000 Leuven, Belgium
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9
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Valev VK, De Clercq B, Biris CG, Zheng X, Vandendriessche S, Hojeij M, Denkova D, Jeyaram Y, Panoiu NC, Ekinci Y, Silhanek AV, Volskiy V, Vandenbosch GAE, Ameloot M, Moshchalkov VV, Verbiest T. Distributing the optical near-field for efficient field-enhancements in nanostructures. Adv Mater 2012; 24:OP208-OP272. [PMID: 22761007 DOI: 10.1002/adma.201201151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Indexed: 06/01/2023]
Affiliation(s)
- V K Valev
- Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, BE-3001, Belgium.
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10
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Mamonov EA, Murzina TV, Kolmychek IA, Maydykovsky AI, Valev VK, Silhanek AV, Verbiest T, Moshchalkov VV, Aktsipetrov OA. Chirality in nonlinear-optical response of planar G-shaped nanostructures. Opt Express 2012; 20:8518-8523. [PMID: 22513560 DOI: 10.1364/oe.20.008518] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Chirality effects in optical second harmonic generation (SHG) are studied in periodic planar arrays of gold G-shaped nanostructures. We show that G-shaped structures of different handedness demonstrate different SHG efficiency for the left and right circular polarizations, as well as the opposite directions of the SHG polarization plane rotation. The observed effects are interpreted as the appearance of chirality in the SHG response which allows clear distinguishing of two enantiomers.
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Affiliation(s)
- E A Mamonov
- Department of Physics, M.V. Lomonosov Moscow State University, Leninskie Gory, Moscow119991, Russia
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11
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Valev VK, Clercq BD, Zheng X, Denkova D, Osley EJ, Vandendriessche S, Silhanek AV, Volskiy V, Warburton PA, Vandenbosch GAE, Ameloot M, Moshchalkov VV, Verbiest T. The role of chiral local field enhancements below the resolution limit of Second Harmonic Generation microscopy. Opt Express 2012; 20:256-264. [PMID: 22274348 DOI: 10.1364/oe.20.000256] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
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.
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Affiliation(s)
- V K Valev
- Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.
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12
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Mamonov EA, Murzina TV, Kolmychek IA, Maydykovsky AI, Valev VK, Silhanek AV, Ponizovskaya E, Bratkovsky A, Verbiest T, Moshchalkov VV, Aktsipetrov OA. Coherent and incoherent second harmonic generation in planar G-shaped nanostructures. Opt Lett 2011; 36:3681-3683. [PMID: 21931431 DOI: 10.1364/ol.36.003681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Azimuthal anisotropy of Stokes parameters of the second harmonic generation (SHG) generated and observed in reflection from a periodic planar area of G-shaped gold nanostructures is studied. A strong anisotropy of both coherent and incoherent SHG components is observed. Finite-difference time-domain calculations prove that the observed effects are due to the anisotropic enhancement of the fundamental radiation within the G-shaped structures.
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Affiliation(s)
- E A Mamonov
- Department of Physics, M.V. Lomonosov Moscow State University, Moscow, Russia.
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13
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Valev VK, Silhanek AV, Jeyaram Y, Denkova D, De Clercq B, Petkov V, Zheng X, Volskiy V, Gillijns W, Vandenbosch GAE, Aktsipetrov OA, Ameloot M, Moshchalkov VV, Verbiest T. Hotspot decorations map plasmonic patterns with the resolution of scanning probe techniques. Phys Rev Lett 2011; 106:226803. [PMID: 21702624 DOI: 10.1103/physrevlett.106.226803] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 03/23/2011] [Indexed: 05/31/2023]
Abstract
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.
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Affiliation(s)
- V K Valev
- Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, Leuven, Belgium.
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14
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Pollet J, Delport F, Janssen K, Tran D, Wouters J, Verbiest T, Lammertyn J. Fast and accurate peanut allergen detection with nanobead enhanced optical fiber SPR biosensor. Talanta 2011; 83:1436-41. [DOI: 10.1016/j.talanta.2010.11.032] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2010] [Revised: 10/31/2010] [Accepted: 11/14/2010] [Indexed: 11/16/2022]
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15
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Clays K, Hendrickx E, Triest M, Verbiest T, Persoons A, Dehu C, Brédas JL. Nonlinear optical properties of proteins measured by hyper-rayleigh scattering in solution. Science 2010; 262:1419-22. [PMID: 17736822 DOI: 10.1126/science.262.5138.1419] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Hyper-Rayleigh scattering has been used to determine the nonlinear optical properties of a chromophore-containing protein in solution. Because the technique of hyper-Rayleigh scattering allows the measurement of hyperpolarizabilities in an isotropic solution without the application of an electric field, this method is ideally suited for the study of proteins that carry a net charge. The observed orientational correlation between the nonlinear optical chromophores in incompletely solubilized protein molecules suggests that guidelines from protein structures can be used for the engineering of supramolecular structures with high optical nonlinearity.
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16
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Valev VK, Silhanek AV, Smisdom N, De Clercq B, Gillijns W, Aktsipetrov OA, Ameloot M, Moshchalkov VV, Verbiest T. Linearly polarized second harmonic generation microscopy reveals chirality. Opt Express 2010; 18:8286-8293. [PMID: 20588674 DOI: 10.1364/oe.18.008286] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In optics, chirality is typically associated with circularly polarized light. Here we present a novel way to detect the handedness of chiral materials with linearly polarized light. We performed Second Harmonic Generation (SHG) microscopy on G-shaped planar chiral nanostructures made of gold. The SHG response originates in distinctive hotspots, whose arrangement is dependent of the handedness. These results uncover new directions for studying chirality in artificial materials.
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17
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Valev VK, Silhanek AV, Verellen N, Gillijns W, Van Dorpe P, Aktsipetrov OA, Vandenbosch GAE, Moshchalkov VV, Verbiest T. Asymmetric optical second-harmonic generation from chiral G-shaped gold nanostructures. Phys Rev Lett 2010; 104:127401. [PMID: 20366565 DOI: 10.1103/physrevlett.104.127401] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2009] [Indexed: 05/29/2023]
Abstract
We present a new electromagnetic phenomenon-the asymmetric second-harmonic generation from planar chiral structures. The effect consists in distinguishing the handedness of a chiral material by rotating the sample in an experiment involving solely linearly polarized light. This phenomenon originates in the surface plasmon resonance of chiral gold nanostructures, where homodyne interference of anisotropic and chiral electric and/or magnetic multipoles appears to play an important role.
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Affiliation(s)
- V K Valev
- Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.
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18
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Valev VK, Smisdom N, Silhanek AV, De Clercq B, Gillijns W, Ameloot M, Moshchalkov VV, Verbiest T. Plasmonic ratchet wheels: switching circular dichroism by arranging chiral nanostructures. Nano Lett 2009; 9:3945-8. [PMID: 19863052 DOI: 10.1021/nl9021623] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since upon reordering them the SHG-CD effect disappears. Microscopy reveals SHG "hotspots" assemblies, which originate in enantiomerically sensitive plasmon modes, having the novel property of exhibiting a chiral geometry themselves in relation with the handedness of the material. These results open new frontiers in studying chirality.
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Affiliation(s)
- V K Valev
- Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.
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19
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Persoons A, Kauranen M, Elshocht SV, Verbiest T, Ma L, Pu L, Langeveld-voss BMW, Meijer EW. Chiral effects in second-order nonlinear optics. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259808044315] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- A. Persoons
- a Laboratory of Chemical and Biological Dynamics , Catholic University of Leuven , Celestijnenlaan 200 D, pc Leuven , Belgium
| | - M. Kauranen
- a Laboratory of Chemical and Biological Dynamics , Catholic University of Leuven , Celestijnenlaan 200 D, pc Leuven , Belgium
| | - S. Van Elshocht
- a Laboratory of Chemical and Biological Dynamics , Catholic University of Leuven , Celestijnenlaan 200 D, pc Leuven , Belgium
| | - T. Verbiest
- a Laboratory of Chemical and Biological Dynamics , Catholic University of Leuven , Celestijnenlaan 200 D, pc Leuven , Belgium
| | - L. Ma
- b Department of Chemistry , University of Virginia , Charlottesville , VA , 22901
| | - L. Pu
- a Laboratory of Chemical and Biological Dynamics , Catholic University of Leuven , Celestijnenlaan 200 D, pc Leuven , Belgium
| | - B. M. W. Langeveld-voss
- c Laboratory of Organic Chemistry , Eindhoven University of Technology , PO Box 513, 5600 , MB , Eindhoven , The Netherlands
| | - E. W. Meijer
- c Laboratory of Organic Chemistry , Eindhoven University of Technology , PO Box 513, 5600 , MB , Eindhoven , The Netherlands
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20
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Verbiest T, Sioncke S, Koeckelberghs G, Samyn C, Persoons A, Botek E, André JM, Champagne B. Nonlinear optical properties of spincoated films of chiral polythiophenes. Chem Phys Lett 2005. [DOI: 10.1016/j.cplett.2005.01.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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21
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Briers D, Picard I, Verbiest T, Persoons A, Samyn C. Nonlinear optical active poly(adamantyl methacrylate-methyl vinyl urethane)s functionalised with phenyltetraene-bridged chromophore. POLYMER 2004. [DOI: 10.1016/j.polymer.2003.11.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Gubbelmans E, Van den Broeck K, Verbiest T, Van Beylen M, Persoons A, Samyn C. High glass transition temperature chromophore functionalised poly(phenylquinoxalines) for nonlinear optics. Eur Polym J 2003. [DOI: 10.1016/s0014-3057(02)00307-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Verbiest T, Clays K, Samyn C, Wolff J, Reinhoudt D, Persoons A. Investigations of the Hyperpolarizability in Organic Molecules from Dipolar to Octopolar Systems. J Am Chem Soc 2002. [DOI: 10.1021/ja00099a058] [Citation(s) in RCA: 173] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Miller RD, Burland DM, Jurich M, Lee VY, Moylan CR, Thackara JI, Twieg RJ, Verbiest T, Volksen W. Donor-Embedded Nonlinear Optical Side Chain Polyimides Containing No Flexible Tether: Materials of Exceptional Thermal Stability for Electrooptic Applications. Macromolecules 2002. [DOI: 10.1021/ma00118a026] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Verbiest T, Burland DM, Jurich MC, Lee VY, Miller RD, Volksen W. Electrooptic Properties of Side-Chain Polyimides with Exceptional Thermal Stabilities. Macromolecules 2002. [DOI: 10.1021/ma00112a060] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Koetse M, Laschewsky A, Jonas A, Verbiest T. Orientation of functional groups in polyelectrolyte multilayers studied by second-harmonic generation (SHG). Colloids Surf A Physicochem Eng Asp 2002. [DOI: 10.1016/s0927-7757(01)00940-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Samyn C, Ballet W, Verbiest T, Van Beylen M, Persoons A. Chromophore functionalised maleimide copolymers with high poling stabilities of the nonlinear optical effect at elevated temperature. POLYMER 2001. [DOI: 10.1016/s0032-3861(01)00405-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Verbiest T, Elshocht SV, Kauranen M, Hellemans L, Snauwaert J, Nuckolls C, Katz TJ, Persoons A. Strong enhancement of nonlinear optical properties through supramolecular chirality. Science 1998; 282:913-5. [PMID: 9794754 DOI: 10.1126/science.282.5390.913] [Citation(s) in RCA: 483] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
A new approach to second-order nonlinear optical (NLO) materials is reported, in which chirality and supramolecular organization play key roles. Langmuir-Blodgett films of a chiral helicene are composed of supramolecular arrays of the molecules. The chiral supramolecular organization makes the second-order NLO susceptibility about 30 times larger for the nonracemic material than for the racemic material with the same chemical structure. The susceptibility of the nonracemic films is a respectable 50 picometers per volt, even though the helicene structure lacks features commonly associated with high nonlinearity. Susceptibility components that are allowed only by chirality dominate the second-order NLO response.
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Affiliation(s)
- T Verbiest
- T. Verbiest, S. Van Elshocht, M. Kauranen, L. Hellemans, J. Snauwaert, A. Persoons, Laboratory of Chemical and Biological Dynamics, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Heverlee, Belgium. C. Nuckolls and T. J
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Beljonne D, Shuai Z, Brédas JL, Kauranen M, Verbiest T, Persoons A. Electro-optic response of chiral helicenes in isotropic media. J Chem Phys 1998. [DOI: 10.1063/1.475501] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Verbiest T, Burland DM, Walsh CA. Use of the Lognormal Distribution Function To Describe Orientational Relaxation in Optically Nonlinear Polymers. Macromolecules 1996. [DOI: 10.1021/ma960179r] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- T. Verbiest
- IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
| | - D. M. Burland
- IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
| | - C. A. Walsh
- IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099
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Teerenstra MN, Hagting JG, Schouten AJ, Nolte RJM, Kauranen M, Verbiest T, Persoons A. Second-Harmonic Generation from Floating Monolayers and Langmuir−Blodgett Multilayers of Poly(isocyanide)s. Macromolecules 1996. [DOI: 10.1021/ma951202w] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | - R. J. M. Nolte
- Department of Organic Chemistry, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Teerenstra MN, Klap RD, Bijl MJ, Schouten AJ, Nolte RJM, Verbiest T, Persoons A. Preparation of Langmuir−Blodgett Mono- and Multilayers of Copolymers of Isocyanides with NLO-Active Side Chains. Effect of a Spacer Group between the NLO Chromophore and the Polymer Backbone. Macromolecules 1996. [DOI: 10.1021/ma951203o] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | - R. J. M. Nolte
- Department of Organic Chemistry, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Kauranen M, Boutton C, Verbiest T, Teerenstra MN, Clays K, Schouten AJ, Nolte RJM, Persoons A. Supramolecular Second-Order Nonlinearity of Polymers with Orientationally Correlated Chromophores. Science 1995. [DOI: 10.1126/science.270.5238.966] [Citation(s) in RCA: 149] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Verbiest T, Burland DM, Jurich MC, Lee VY, Miller RD, Volksen W. Exceptionally Thermally Stable Polyimides for Second-Order Nonlinear Optical Applications. Science 1995; 268:1604-6. [PMID: 17754614 DOI: 10.1126/science.268.5217.1604] [Citation(s) in RCA: 207] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The thermal stability of the electric field induced poled order in a new class of second-order optically nonlinear polymers, "donor-imbedded" side-chain polyimides containing no flexible connectors or tethers to the nonlinear optical (NLO) chromophore, is investigated. In these polymers, the electron-donor part of the chromophore is a diaryl-substituted amine that is incorporated as a part of the polymer backbone. The donorimbedded systems used in this study have exceptional chemical stabilities at elevated temperatures (350 degrees C) and impressive poled order stability at extremely high temperatures (300 degrees C). In both respects, they were significantly more stable than a true side-chain polyimide with a similar NLO-active chromophore covalently linked to the polymer backbone by a flexible tether group.
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Laidlaw WM, Denning RG, Verbiest T, Chauchard E, Persoons A. Large second-order optical polarizabilities in mixed-valency metal complexes. Nature 1993. [DOI: 10.1038/363058a0] [Citation(s) in RCA: 146] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Verbiest T, Clays K, Persoons A, Meyers F, Brédas JL. Determination of the hyperpolarizability of an octopolar molecular ion by hyper-Rayleigh scattering. Opt Lett 1993; 18:525-527. [PMID: 19802189 DOI: 10.1364/ol.18.000525] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The first observation to our knowledge of a second-order nonlinear optical effect in a nonpolar molecular ion is reported. Hyper-Rayleigh scattering was observed from aqueous and organic solutions of the tricyanomethanide ion [C(CN)(3)](-). Because of the absence of a dipole moment and the presence of a charge in this planar, nonpolar, but highly polarizable molecular anion with D(3h) symmetry, no electric-field-induced second-harmonic-generation experiments are possible. The experimental values for the first hyperpolarizability beta(xxx) [(7 +/- 1.5) x 10(-30) esu, independent of the solvent] are in good agreement with the results from quantum-chemical calculations.
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