Koen Clays
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View article: From Chains to Chromophores: Tailored Thermal and Linear/Nonlinear Optical Features of Asymmetric Pyrimidine—Coumarin Systems
From Chains to Chromophores: Tailored Thermal and Linear/Nonlinear Optical Features of Asymmetric Pyrimidine—Coumarin Systems Open
Eleven novel asymmetric pyrimidine derivatives were synthesized. The pyrimidine core was functionalized with a coumarin chromophore and a pro-mesogenic fragment bearing either chiral or linear alkyl chains of variable length and substituti…
View article: Structure and Nonlinear Optical Characterization of a New Acentric Crystal of a 4-Hydroxybenzohydrazide Derivative
Structure and Nonlinear Optical Characterization of a New Acentric Crystal of a 4-Hydroxybenzohydrazide Derivative Open
We report the crystal structure and nonlinear optical (NLO) characterization of the monohydrate form of N′-[(E)-(2-fluorophenyl)methylidene]-4-hydroxybenzohydrazide (o-FHH), an organic compound showing strong potential for second-order non…
View article: Donor and Geometry Optimization: Fresh Perspectives for the Design of Polyoxometalate Charge Transfer Chromophores
Donor and Geometry Optimization: Fresh Perspectives for the Design of Polyoxometalate Charge Transfer Chromophores Open
Three linear, dipolar arylimido-polyoxometalate (POM) and one 2-dimensional bis-functionalized arylimido-polyoxometalate charge transfer chromophore, with diphenylacetylene bridges, have been synthesized and studied by spectroelectr…
View article: Synthesis and Optical and Nonlinear Optical Properties of Linear and Two-Dimensional Charge Transfer Chromophores Based on Polyoxometalates
Synthesis and Optical and Nonlinear Optical Properties of Linear and Two-Dimensional Charge Transfer Chromophores Based on Polyoxometalates Open
We present the first study of arylimido-polyoxometalate nonlinear optical (NLO) chromophores with two-dimensional (2D) structures, and a comparison with one-dimensional analogues, through the synthesis of a family of arylimido-hexamolybdat…
View article: Imaging with a twist: Three-dimensional insights of the chiral nematic phase of cellulose nanocrystals via SHG microscopy
Imaging with a twist: Three-dimensional insights of the chiral nematic phase of cellulose nanocrystals via SHG microscopy Open
Cellulose nanocrystals (CNCs) are bio-based nanoparticles that, under the right conditions, self-align into chiral nematic liquid crystals with a helical pitch. In this work, we exploit the inherent confocal effect of second-harmonic gener…
View article: From Grayscale Photopolymerization 3D Printing to Functionally Graded Materials (Adv. Funct. Mater. 32/2024)
From Grayscale Photopolymerization 3D Printing to Functionally Graded Materials (Adv. Funct. Mater. 32/2024) Open
Functionally Graded Materials Functionally graded materials (FGMs) are utilized in various fields, including biomedical implants, microfluidics, and soft robotics. However, conventional techniques have limitations in customizing FGMs in 3D…
View article: Smart design of highly luminescent octupolar mesogenic tetra styryl-alkynyl bipyrimidine-based chromophores presenting non-linear optical properties
Smart design of highly luminescent octupolar mesogenic tetra styryl-alkynyl bipyrimidine-based chromophores presenting non-linear optical properties Open
View article: From Grayscale Photopolymerization 3D Printing to Functionally Graded Materials
From Grayscale Photopolymerization 3D Printing to Functionally Graded Materials Open
Functionally graded materials (FGMs) have spatial variations in structure or composition that result in gradients in their mechanical, thermal, swelling, or other properties. FGMs have garnered significant research interest because of thei…
View article: Nonlinear optical response of 1H-indene-based donor-acceptor chromophores. Influence of the higher-lying states on the first hyperpolarizability
Nonlinear optical response of 1H-indene-based donor-acceptor chromophores. Influence of the higher-lying states on the first hyperpolarizability Open
View article: Non‐Linear Optical Activity of Chiral Bipyrimidine‐Based Thin Films
Non‐Linear Optical Activity of Chiral Bipyrimidine‐Based Thin Films Open
An original series of bipyrimidine‐based chromophores featuring alkoxystyryl donor groups bearing short chiral (S) ‐2‐methylbutyl chains in positions 4, 3,4 and 3,5, connected to electron‐accepting 2,2‐bipyrimidine rings, has been develope…
View article: Multimodal Optical Analysis of Regioregular Poly(3-hexylthiophene)s Reveals Peculiar Aggregation Dynamics
Multimodal Optical Analysis of Regioregular Poly(3-hexylthiophene)s Reveals Peculiar Aggregation Dynamics Open
sponsorship: T.V. acknowledges financial support from the KU Leuven (Interdisciplinary Network Project IDN/19/014). Y.d.C. acknowledges financial support from FWO (Junior Postdoc number 1234222N). (Fonds Wetenschappelijk Onderzoek|IDN/19/0…
View article: CCDC 2305545: Experimental Crystal Structure Determination
CCDC 2305545: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: CCDC 2266709: Experimental Crystal Structure Determination
CCDC 2266709: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Bridge improvement work: maximising non-linear optical performance in polyoxometalate derivatives
Bridge improvement work: maximising non-linear optical performance in polyoxometalate derivatives Open
New phenyl and stilbene-bridged polyoxometalate (POM) charge-transfer chromophores with diphenylamino donor groups produce, respectively, the highest intrinsic and absolute quadratic hyperpolarisabilities measured for such species.
View article: DMD-based optical printing of PHEMA hydrogel gratings for sensitive and rapid alcohol sensing
DMD-based optical printing of PHEMA hydrogel gratings for sensitive and rapid alcohol sensing Open
This work presents a straightforward, controllable, cost-effective optical approach for printing HEMA-based alcohol sensors, where the sensors' diffraction efficiency varies in response to hydrogel behavior at different alcohol concentrati…
View article: New Multifunctional Bipyrimidine‐Based Chromophores for NLO‐Active Thin‐Film Preparation**
New Multifunctional Bipyrimidine‐Based Chromophores for NLO‐Active Thin‐Film Preparation** Open
New synthesized bipyrimidine‐based chromophores presenting alkoxystyryl donor groups carrying aliphatic achiral and chiral chains in the 4 position, connected to electron‐accepting 2,2‐bipyrimidine cores have been synthesized. Their linear…
View article: Digital halftoning for printer-independent stereolithography of functionally graded materials
Digital halftoning for printer-independent stereolithography of functionally graded materials Open
sponsorship: G.F. acknowledges the scholarship provided by China Scholarship Council (CSC201708430113) and KU Leuven for the funding of a postdoctoral mandate (PDMT2/22/050). The authors acknowledge KU Leuven for funding research projects …
View article: Frontispiz: Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids
Frontispiz: Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids Open
Nonlinear Optics. 5-Alkynylruthenium-15-nitrophenyl-functionalized nickel porphyrins exhibiting record quadratic optical nonlinearities and outstanding two-, three-, and four-photon absorption cross-sections are reported by Mark G. Humphre…
View article: Frontispiece: Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids
Frontispiece: Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids Open
Nonlinear Optics. 5-Alkynylruthenium-15-nitrophenyl-functionalized nickel porphyrins exhibiting record quadratic optical nonlinearities and outstanding two-, three-, and four-photon absorption cross-sections are reported by Mark G. Humphre…
View article: Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids
Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids Open
Porphyrins are important macrocycles with applications in several areas including therapy, catalysis, and sensing. Strong nonlinear optical (NLO) responses are the key to fully exploiting the potential of these biocompatible molecules. We …
View article: Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids
Outstanding Quadratic to Septic Optical Nonlinearity at Dipolar Alkynylmetal‐Porphyrin Hybrids Open
Porphyrins are important macrocycles with applications in several areas including therapy, catalysis, and sensing. Strong nonlinear optical (NLO) responses are the key to fully exploiting the potential of these biocompatible molecules. We …
View article: CCDC 2214337: Experimental Crystal Structure Determination
CCDC 2214337: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Digital Halftoning for Printer-Independent Stereolithography of Functionally Graded Materials
Digital Halftoning for Printer-Independent Stereolithography of Functionally Graded Materials Open
View article: Nonlinear Optical Response of 1h-Indene-Based Donor-Acceptor Chromophores. Influence of the Higher-Lying States on the First Hyperpolarizability
Nonlinear Optical Response of 1h-Indene-Based Donor-Acceptor Chromophores. Influence of the Higher-Lying States on the First Hyperpolarizability Open
View article: Size economy and first hyperpolarizability: synthesis and nonlinear optical behavior of ferrocene-based donor–acceptor chromophores lacking π-linkers
Size economy and first hyperpolarizability: synthesis and nonlinear optical behavior of ferrocene-based donor–acceptor chromophores lacking π-linkers Open
The question of size economy in the design of chromophores for nonlinear optics is addressed in this investigation.
View article: Electrochemically‐Switched 2nd Order Non‐Linear Optical Response in an Arylimido‐Polyoxometalate with High Contrast and Cyclability
Electrochemically‐Switched 2nd Order Non‐Linear Optical Response in an Arylimido‐Polyoxometalate with High Contrast and Cyclability Open
Electrochemically switched 2 nd order non‐linear optical responses have been demonstrated for the first time in polyoxometalates (POMs), with an arylimido‐derivative showing a leading combination of high on/off contrast (94 %), high visibl…
View article: Electrochemically‐Switched 2nd Order Non‐Linear Optical Response in an Arylimido‐Polyoxometalate with High Contrast and Cyclability
Electrochemically‐Switched 2nd Order Non‐Linear Optical Response in an Arylimido‐Polyoxometalate with High Contrast and Cyclability Open
Electrochemically switched 2 nd order non‐linear optical responses have been demonstrated for the first time in polyoxometalates (POMs), with an arylimido‐derivative showing a leading combination of high on/off contrast (94 %), high visibl…
View article: CCDC 2141574: Experimental Crystal Structure Determination
CCDC 2141574: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Highly efficient unbridged D-A+(D) chromophores based on the quinolizinium cation for nonlinear optical (NLO) applications
Highly efficient unbridged D-A+(D) chromophores based on the quinolizinium cation for nonlinear optical (NLO) applications Open
View article: The wavelength-dependent non-linear absorption and refraction of Au<sub>25</sub> and Au<sub>38</sub> monolayer-protected clusters
The wavelength-dependent non-linear absorption and refraction of Au<sub>25</sub> and Au<sub>38</sub> monolayer-protected clusters Open
Qualitative different non-linear optical phenomena with high nonlinear cross sections, as measured using the z -scan technique in combination with a tunable nanosecond laser source, were found at different excitation wavelengths.