A5054249479- Nonlinear Optical Materials Studies
- Laser Material Processing Techniques
- Advanced Fluorescence Microscopy Techniques
- Photoacoustic and Ultrasonic Imaging
- Laser-Ablation Synthesis of Nanoparticles
- Photonic Crystals and Applications
- Nanofabrication and Lithography Techniques
- Ocular and Laser Science Research
- Optical Coherence Tomography Applications
- Liquid Crystal Research Advancements
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Force Microscopy Techniques and Applications
- Bone Tissue Engineering Materials
- Photochromic and Fluorescence Chemistry
- 3D Printing in Biomedical Research
- Electrohydrodynamics and Fluid Dynamics
- Photonic and Optical Devices
FORTH Institute of Electronic Structure and Laser
2012-2023
Foundation for Research and Technology Hellas
2011-2023
FORTH Institute of Chemical Engineering Sciences
2023
University of Crete
2011-2020
Vilnius University
2020
Kaunas University of Technology
2020
University of California, Irvine
2020
Swinburne University of Technology
2020
Tokyo Institute of Technology
2020
We present a new method for increasing the resolution of direct femtosecond laser writing by multiphoton polymerization, based on quencher diffusion. This relies combination mobile quenching molecule with slow scanning speed, allowing diffusion in scanned area and depletion multiphoton-generated radicals. The material we use is an organic–inorganic hybrid, while photopolymerizable amine-based monomer which bound polymer backbone upon fabrication structures. this to fabricate woodpile...
Abstract Ultrafast laser 3D lithography based on non-linear light–matter interactions, widely known as multi-photon (MPL), offers unrivaled precision rapid prototyping and flexible additive manufacturing options. printing equipment MPL is already commercially available, yet there still no comprehensive understanding of factors determining spatial resolution, accuracy, fabrication throughput, repeatability, standardized metrology methods for the accurate characterization produced objects...
Abstract Non‐linear excitation microscopy offers several advantages for in‐vivo imaging compared to conventional confocal techniques. However, tissue penetration can still be an issue due scattering and spherical aberrations induced on focused beams by the tissue. The use of low numerical aperture objectives pass through outer layers skin, together with high dioptric power microlenses implanted close observation volume, beneficial reduction optical aberrations. Here, Fibroblast cell culture...
We report for the first time on redox multiphoton polymerization of an organic–inorganic composite material, in which one components, a vanadium metallo-organic complex, initiates polymerization. The employs absorption to self-generate radicals by photoinduced reduction metal species from (V) (IV). exploit this material fabrication fully 3D structures with 200 nm resolution, employing femtosecond laser operating at 800 nm, absence photoinitiator. Nonlinear measurements indicate that use...
Abstract Multiphoton lithography (MPL), based on multiphoton polymerization (MPP), is a powerful technique for the fabrication of 3D structures used in tissue engineering and other biomedical applications, microoptics, nanophotonics, micro‐/nanomechanics, micro‐/nanofluidics. MPL localized polymerization/cross‐linking photosensitive materials induced by femtosecond laser pulses. The use an appropriate photoinitiator (PI) required to initiate process. However, several studies have...
Abstract Optics manufacturing technology is predicted to play a major role in the future production of integrated photonic circuits. One drawbacks realization circuits damage optical materials by intense laser pulses. Here, we report on preparation series organic–inorganic hybrid photoresists that exhibit enhanced laser-induced threshold. These showed be candidates for fabrication micro-optical elements (MOEs) using three-dimensional multiphoton lithography. Moreover, they demonstrate...
The development of dynamically responsive 3D photonic elements, which is crucial for the design active integrated circuits, requires incorporation material systems with fast and tunable response. To this end, semiconductor quantum dots have been widely used to perform as system be integrated; nonetheless, multiple-step processing usually required functions preserved, thereby restricting functionality elements mostly infrared. Here, we report a simple scheme realization visible light devices...
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 organic-inorganic hybrid material is presented containing a quenching moiety for improving the resolution of Direct femtosecond Laser Writing by multi-photon polymerization. By exploiting diffusion quencher molecule confining radical in scanned area, sub-100nm achieved. 3D woodpile structures with rod spacing 400nm are successfully fabricated. We optically characterize these woodpiles and we show that they exhibit well-ordered diffraction patterns stopgaps down to near-infrared wavelengths.
Non-linear excitation microscopy offers superior in-vivo imaging but faces challenges in deep tissue. High numerical aperture beams suffer spherical aberrations, while tissue scattering impacts image quality. To address this, we propose implantable microlenses for precise focusing below the skin lab animals. By using low lasers, avoid aberrations induced by high NA objectives. Our study presents various microlens designs differing size, shape, and fabrication methods, all on glass or...
Ultrafast laser 3D lithography based on non-linear light-matter interactions, widely known as multi-photon (MPL), offers unrivaled precision rapid prototyping and flexible additive manufacturing options. printing equipment MPL are already commercially available, yet there is still no comprehensive understanding of factors determining spatial resolution, accuracy, fabrication throughput, repeatability, standardized metrology methods for the accurate characterization produced objects their...
The increasing demand for functional nanodevices in sustainable energy applications necessitates the development of innovative approaches. In this study, we present fabrication and characterization three-dimensional (3D) structures coated with titanium dioxide (TiO2) nanorods (NRs). These novel devices are created through integration four distinct techniques, multi-photon lithography, post-thermal treatment, pulsed laser deposition, an aqueous chemical growth, enabling their unique...
The paper presents the results on fabrication of 3D high resolution nanostructures containing cadmium sulfide (CdS) quantum dots (QDs) and exhibiting higher order diffraction patterns stop-gaps at visible wavelengths. These are fabricated using direct laser writing (DLW) novel, organic-inorganic hybrid materials.
The current protocols for biocompatibility assessment of biomaterials, based on histopathology, require the sacrifice a huge number laboratory animals with an unsustainable ethical burden and remarkable cost. Intravital microscopy techniques can be used to study implantation outcomes in real time though limited capabilities quantification longitudinal studies, mainly restricted by light penetration spatial resolution deep tissues. We present outline first tests novel chip which aims enable...
Abstract Non-linear excitation microscopy offers several advantages for in-vivo imaging compared to conventional confocal techniques. However, tissue penetration can still be an issue due scattering and spherical aberrations induced on focused beams by the tissue. The use of low numerical aperture objectives pass through outer layers skin, together with high dioptric power microlenses implanted close observation volume, beneficial reduction optical aberrations. Here, we develop test...
We demonstrate the fabrication of 3D nanostructures by multiphoton polymerization using a material that doesnt contain photoinitiator.
The authors present investigations on the fabrication of three-dimensional nanostructures by direct laser writing using organic-inorganic hybrid materials that (i) can be structured accurately to sub-100nm, (ii) contain quantum dots, and (iii) selectively covered with metal. Direct multi-photon polymerization is a nonlinear optical technique which allows structures resolution beyond diffraction limit. process initiated when beam an ultra-fast infrared tightly focused into volume transparent,...
We report new methods of 2 photon polymerization microlenses with high numerical aperture, large diameter and good optical quality. characterize the aberrations these lenses that, coupled to raster scanning microscopes, allow two-photon excitation imaging cells. In-vivo non-linear will be also discussed, opening possibility use micro-lenses in implants for continuous inspection biological dynamics vivo.
We report new methods of two-photon polymerization microlenses with high numerical aperture, large diameter and good optical quality. characterize the aberrations these lenses that, coupled to raster scanning microscopes, allow excitation imaging cells. In-vivo non-linear will be also discussed, opening possibility use micro-lenses in implants for continuous inspection biological dynamics vivo.
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text I. Sakellari, E. Kabouraki, K. Terzaki, D. Gray, C. Fotakis, A. Pikulin, N. Bityurin, M. Vamvakaki, and Farsari, "Direct fs Laser Writing: Principles Applications," in International Photonics Optoelectronics Meetings, OSA Technical Digest (online) (Optica Publishing Group, 2012), paper MTh5C.3. Export BibTex Endnote (RIS) HTML Plain alert Save article
In this work, we present our most recent results on the fabrication of 3D high-resolution woodpile photonic crystals containing an organic-inorganic silicon-zirconium (Si-Zr) composite and cadmium sulfide (CdS) quantum dots (QDs). The structures are fabricated by combining Direct Laser Writing two-photon absorption in-situ synthesis CdS nanoparticles inside matrix. CdS-Zr-Si material exhibits a high nonlinear refractive index value measured means Z-scan method. with varying inlayer...