A5112981094- Nonlinear Optical Materials Studies
- Nanofabrication and Lithography Techniques
- Laser Material Processing Techniques
- Photopolymerization techniques and applications
- Advanced Fluorescence Microscopy Techniques
- Photochromic and Fluorescence Chemistry
- Photonic Crystals and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Near-Field Optical Microscopy
- Surface Roughness and Optical Measurements
- Luminescence and Fluorescent Materials
- Force Microscopy Techniques and Applications
- Polymer composites and self-healing
- Advancements in Photolithography Techniques
- Optical Coherence Tomography Applications
- Photonic and Optical Devices
- Ocular and Laser Science Research
- Photochemistry and Electron Transfer Studies
Foundation for Research and Technology Hellas
2020-2025
Vilnius University
2025
University of Crete
2019-2023
FORTH Institute of Electronic Structure and Laser
2023
FORTH Institute of Chemical Engineering Sciences
2023
Abstract The rapid development of additive manufacturing has fueled a revolution in various research fields and industrial applications. Among the myriad advanced 3D printing techniques, two‐photon polymerization lithography (TPL) uniquely offers significant advantage nanoscale print resolution, been widely employed diverse fields, for example, life sciences, materials mechanics, microfluidics. More recently, by virtue optical transparency most resins used, TPL is finding new applications...
<title>Abstract</title> The two-photon absorption (TPA) and non-linear refraction coefficients β n<sub>2</sub> of SZ2080<sup>TM</sup> resist with the photo-initiators (PI) IRG369 BIS (Irgacure 369 4,4' bis(diethylamino)-benzophenone or Michler’s ketone) are determined using Z-scan method at a wavelength 515 nm. nonlinear response host polymer is shown to have considerable contribution energy deposition despite addition PI, as makes up majority 99% in solution. TPA cross section σ = 5.7 ± 0.4...
<title>Abstract</title> Multi-photon lithography (MPL), an additive manufacturing method, enables the fabrication of intricate three-dimensional micro- and nanostructures with high spatial resolution, crucial for applications in photonics, micro-optics, biomedicine. Central to performance MPL is choice photoinitiator (PI), which governs polymerization efficiency, application-specific functionality. However, conventional PIs often suffer from drawbacks such as auto-fluorescence poor spectral...
The present work reports on the ultrafast nonlinear optical (NLO) properties of a series D−π–Α and D–A push–pull carbazole-based dyes establishes correlation between these their efficiency for potential photonic optoelectronic applications such as multiphoton lithography (MPL). NLO studied are determined by two distinct experimental techniques, Z-scan pump–probe Kerr effect (OKE), employing 246 fs laser pulses at 515 nm. results indicate that chemical functionalization carbazole moiety with...
Abstract Laser direct writing employing multi-photon 3D polymerisation is a scientific and industrial tool used in various fields such as micro-optics, medicine, metamaterials, programmable materials, etc., due to the fusion of high-throughput fine features down hundreds nm. Some limitations technology applicability emerge from photo-resin properties, however any material modifications can strongly affect its printability, photoexcitation conditions alter well. Here we present...
A novel dual cure photopolymerizable system was developed by combining two plant-derived acrylic monomers, acrylated epoxidized soybean oil and vanillin dimethacrylate, as well the thiol monomer pentaerythritol tetrakis (3-mercaptopropionate). Carefully selected resin composition allowed researchers to overcome earlier stability/premature polymerization problems obtain stable (up six months at 4 °C) selectively-polymerizable resin. The demonstrated rapid photocuring without an induction...
<title>Abstract</title> The present work reports on the ultrafast nonlinear optical (NLO) properties of a series D-π-Α and D-A push-pull carbazole-based dyes establishes correlation between these their efficiency for potential photonic optoelectronic applications, such as multiphoton lithography (MPL). NLO studied are determined by two distinct experimental techniques, Z-scan pump-probe Kerr effect (OKE), employing 246 fs laser pulses at 515 nm. results indicate that chemical...
Summary form only given. We present our latest work on the investigation of new photo-initiator materials using two beam initiation threshold (2-BIT) [1] for Direct Laser Writing (DLW). The technique used fabricating, often complex, 3D structures is multiphoton polymerisation (MPP) photopolymers [2]. These have found uses in such diverse fields as optical sensors, metamaterials, and biomedical scaffolding. At heart this localised polymerization/cross linking photosensitive through nonlinear...
This work presents the use of 3D printing by two-photon polymerization (2PP) to fabricate photonic nanojet (PNJ)-generating structures from a hybrid material developed in-house. Since 2PP enables true processing photoresists at microscale with sub-100 nm resolution, it is possible print highly complex without any limitation in their geometry. Thus, paves way investigate novel PNJ-generating structural designs and combine classic ones standard focusing elements, respectively. Simultaneously,...
In the area of optoelectronics, Epsilon Near Zero (ENZ) materials possess a special place, as due to them, high nonlinearities can be achieved. Our interest is focused at telecommunication wavelengths, lot nanophotonic phenomena are taking place. Transparent Conductive Oxides (TCOs) group that used in ENZ regime. Aluminum Zinc Oxide (AZO) TCO has been proved preferred for telecom applications. order achieve higher regime, we fabricate 3D photonic nanostructures, via Multiphoton lithography...
Coherence Scanning Interferometry (CSI) is a non-contact technique for three-dimensional (3D) surface characterization with angstrom-scale vertical resolution, but whose lateral resolution diffraction limited. To enhance the micro-optical elements like microspheres and fibres can be used [1,2]. This combination allows design of an apparatus 3D imaging nanometre better than 100 nm. We demonstrate use two-photon polymerization (2PP) 3D-printing as photonic nanojet (PNJ) generating structure....
Here we report on laser direct writing 3D nanolithography of non-photosensitized <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{SZ}2080^{TM}$</tex> employing various wavelengths including different pulse durations and repetition rates. Ultra-precise truly three-dimensional printing technique known as two-photon or multi-photon polymerization (TPP MPP, respectively) [1] is experimentally validated without the use any photo-initiators...
Arrays of hierarchical microstructures are considered nowadays as an effective method to create hydrophobic surfaces. Herein, we use femtosecond 3D printing manufacture in different geometric patterns. Direct laser writing and, particular, multiphoton polymerization lithography (MPL) with ultrafast pulses has taken additive manufacturing all the way down sub-micrometer scale. MPL is a nanoscale tool offering great potential for rapid prototyping and photonic devices, tissue scaffolds...
We are presenting a model for quantitative description of the polymerization process in 3D-laser microfabrication. With aim to assist estimating necessary power threshold obtain certain feature size, particularly line characteristics, depending on laser and writing speed. The focal distribution as well photoresist is taken into account. do not try gain any chemical insight processes involved, restrict us study multi-photon process. Machine learning used classify input SEM images providing...
Photopolymerization of (meth)acrylate-based formulations has become a widespread method for industry due to the high energy efficiency and low curing times this technology. Various products from simple coatings more complex applications such as additive manufacturing technologies are based on versatile method. Common industrial radical photoinitiators generally aromatic ketones. Benzaldehyde is an organic compound consisting benzene ring with formyl substituent. It simplest aldehyde one most...