A5017619061- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- Semiconductor Lasers and Optical Devices
- Nonlinear Optical Materials Studies
- Analytical Chemistry and Sensors
- Gas Sensing Nanomaterials and Sensors
- Nonlinear Optical Materials Research
- Fullerene Chemistry and Applications
- Optical Network Technologies
- Magneto-Optical Properties and Applications
- Plasmonic and Surface Plasmon Research
- Advanced Chemical Sensor Technologies
- Laser Material Processing Techniques
- Advanced MEMS and NEMS Technologies
- Laser-Ablation Synthesis of Nanoparticles
- Icing and De-icing Technologies
- Plant Surface Properties and Treatments
- Spectroscopy and Laser Applications
- Electrowetting and Microfluidic Technologies
- Horticultural and Viticultural Research
- Photochromic and Fluorescence Chemistry
- Acoustic Wave Resonator Technologies
- Porphyrin and Phthalocyanine Chemistry
Foundation for Research and Technology Hellas
2014-2025
FORTH Institute of Electronic Structure and Laser
2005-2025
National and Kapodistrian University of Athens
2022
FORTH Institute of Computer Science
2004
University of Strathclyde
1995-1998
Many optical fiber sensors designed to recover quasi-static strain fields in the presence of significant temperature changes have been reported recent years. A general theoretical analysis influ- ence systematic errors associated with measurement process is presented and applied a range techniques that are current inter- est literature. The performances methods based on Bragg grating sensors, polarization-maintaining Fabry-Perot interfer- ometers, combined dual-mode interference/polarimetry...
A long-period fiber grating (LPFG) humidity sensor is reported utilizing poly(ethylene oxide)/cobalt chloride (PEO/CoCl2) as a hybrid hygrosensitive cladding coating. thin overlay of the material deposited on LPFG and with exposure to different ambient levels, its spectral properties are modified. The parameters associated sensing mechanism may include those refractive index, absorption, morphological alterations overlaid material. Relative variations in range from 50% 95% have been detected...
A new ethanol vapor detection probe based on an optical fiber long period grating overlaid with a zinc oxide (ZnO) nanorods layer is presented. The ZnO nanorod was developed onto the cladding of using aqueous chemical growth, seeded by thin metallic Zn. growth overlayer monitored in real time for investigating its effect spectral properties device and subsequent role sensing mechanism. Results are presented, correlation between performance. Reversible changes notch extinction ratio more than...
We describe a novel sensing approach based on functionalized microstructured optical fiber-Bragg grating for specific DNA target sequences detection. The inner surface of fiber, where Bragg was previously inscribed, has been by covalent linking peptide nucleic acid probe targeting sequence bearing single point mutation implicated in cystic fibrosis (CF) disease. A solution an oligonucleotide (ON) corresponding to tract the CF gene containing mutated infiltrated inside fiber capillaries and...
The spectral response of a Bragg grating reflector inscribed in microstructured optical fibre is tuned by employing an infiltrated ferrofluid, while modifying the overlap ferrofluidic medium with length. Significant changes terms wavelength shift and extinction ratio were obtained under static magnetic field actuation. Spectral measurements revealed non-bidirectional propagation effects dependent upon relative position between ferrofluid grating. actuation speed device was measured to be...
Optical fiber-based biosensors are an emerging field of research with extremely broad area possible applications and a disruptive potential to turn the paradigm known as lab-on-fiber into reality. In past few years, variety system choices has been explored, ranging from type sensing fiber, optical transducing element, amplification strategies. We revise some approaches design biosensor, highlighting their advantages disadvantages, based on previous literature experience our groups. The...
Results are presented on the efficient spectral manipulation of uniform and chirped Bragg reflectors inscribed in microstructured optical fibers utilizing short lengths ferrofluids infiltrated their capillaries. The ferrofluidic defects can generate either parasitic reflection notch features up to 80% visibility ~0.1 nm shift or tunability bandwidth strength 100% when introduced into gratings. Spectra for different spatial positions characteristics section.
A directional, in-fiber optofluidic magnetometer based on a microstructured optical fiber (MOF) Bragg-grating infiltrated with ferrofluidic defect is presented. Upon application of magnetic field, the moves along length MOF Bragg grating, modifying its reflection spectrum. The capable measuring fields from 317 to 2500 G. operational principle such field probe allows elaboration directional measurements flux.
This paper presents the characterization results of a new all-optical applicator for improved tumor laser ablation treatments that features customized irradiation pattern and built-in temperature sensors. The probe exploits double cladding optical fiber to integrate some Bragg gratings acting as sensing elements in core while guiding high power beam used inner cladding. assessment behavior has been conducted two steps: First, with an agar gel phantom characterize validate grating based...
Abstract Photonics technologies play a crucial role in driving technological advancements within the agrifood industry, aiming to deliver sustainable food and agriculture, offering healthy, nutritious safe for all of us. Particularly, optical sensors imaging systems, together with machine-learning processing advanced lighting, pivotal monitoring crop soil health unprecedented precision, while safeguarding supply chain. This roadmap aims provide an overview state-of-the-art photonics...
Results are presented on the spectral tuning of optical fibre long period gratings utilizing water and oil based ferrofluids as outclading overlayers, under static magnetic field stimulus. Two approaches adopted for modifying ambient refractive index at position grating. In first approach, a ferrofluid is controllably translated along length grating via field. Changes high 7.5 nm 6.5 dB monitored in wavelength strength, respectively, attenuation bands The repeatable performance this device...
Abstract The inscription of relief Bragg grating reflectors on the capillary walls a solid‐core photonic crystal fiber (PCF) using laser radiation is presented. method followed based infiltration and adsorption thin layer toluene capillaries PCF subsequent exposure infiltrated 248‐nm excimer phase mask interference. Gratings are characterized spectrally by scanning electron microscopy while their sensing capabilities exemplified infiltrating them with organic solvents. Thermal studies...
This paper reports on the design, construction and test of a sensor for detecting presence water as function position along an optical fiber length. The technique combines Optical Time Domain Reflectometry (OTDR) with chemically sensitive swellable polymers (hydrogels). Initial experiments have shown that is capable ingress points small 50 cm in length over lengths excess 100 m. has been assembled into robust cable configuration which allowed it to be installed representative bridge...
We report on the design, construction and test of a generic form sensor for making distributed measurements range chemical parameters. The technique combines optical time-domain reflectometry with chemically sensitive water-swellable polymers (hydrogels). Initial experiments have concentrated demonstrating water detector; however, gels been developed that enable this to be readily adapted pH measurements.
We demonstrate, for the first time, an inscription and wet dissolution study of Bragg gratings in a bioresorbable calcium-phosphate glass optical fiber. gratings, with average refractive index changes 5.8×10-4, were inscribed using 193 nm excimer laser radiation. Results on irradiated fiber simulated physiological conditions are presented after immersing tilted grating phosphate buffered saline solution 56 h; selective chemical etching effects also reported. The investigations performed pave...
The third-order non-linear optical behavior of two new series multicomponent systems based on coordination compounds transition metals is reported. These systems, soluble in acetonitrile, are made a metal (Ru or Os) bis-terpyridyl (tpy) unit, as photosensitizer P, connected to one electron acceptor groups, both donor (D) and (A) groups form polyads D−P−A type. absorption refraction response was substantial examined using the z-scan technique. results presented for different excitation...
Many scientific investigations have focused on how space weather phenomena, taking place in the vicinity of Earth, may influence different aspects life Earth and presumably human health itself. From 2005, National Kapodistrian University Athens has established an important position field these by collaborating with various scientists Institutes, both international domestic, heliobiological projects. In this work, Cosmic Ray Group co-operated medical staff from hospitals clinics around...
Abstract The third‐order nonlinear optical properties of fulleropyrrolidine and its salt as well their reduced forms are investigated. Upon reduction, the response increases by up to, sometimes more than, three orders magnitude, giving values comparable to largest ever reported. Calculations experiments provide a coherent picture for these new materials.
An optical fiber long period grating coated with silk fibroin is proposed and demonstrated for monitoring methanol vapors. Results show an exponential increase in the wavelength shift of grating's attenuation band versus vapor pressure, while reaching a value 4 nm 100 mbar methanol. are reported on repeatability response sensor that after multiple exposures to vapors overlayer retains its functionality 12 days drop casting.
We report results on the transient and instantaneous nonlinear optical (NLO) response of C60 higher fullerenes C70, C76, C84 dissolved in toluene using, respectively, z-scan technique energy-dependent transmission measurements with 532 nm, 10 ns laser pulses, Kerr effect 800 100 fs pulses. The NLO C76 are first reported for this fullerene. second hyperpolarizability γ has a negative sign both nanosecond femtosecond pulse regimes. value γ(C70) γ(C76) were much larger than expected from...