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Stanislav Campelj

Stanislav Campelj

PhD

About

18
Publications
3,003
Reads
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446
Citations
Additional affiliations
May 2005 - December 2010
Jožef Stefan Institute
Position
  • Research Associate

Publications

Publications (18)
Article
This Letter describes a miniature Fabry–Perot, contactless, magneto-optic sensor for angular position measurement. The sensor utilizes a magneto-optic fluid comprising barium hexaferrite nanoplatelets that become birefringent in the presence of an external magnetic field and a compact fiber-optic sensor system for tracking the liquid’s optical axis...
Article
We present a novel method to fabricate planar photonic devices for high power applications using modified chemical vapor deposition (MCVD) technology. The MCVD process, usually applied to optic fibers, is used here to deposit a layer of Ge doped silica on a fused silica slab. The doped layer was then heat-treated by a CO <sub xmlns:mml="http://www....
Conference Paper
The influence of Al concentration on the background attenuation of alumosilicate fibers produced with vapor phase doping technique were investigated. Preforms were produced using CDS-03 chelate system. Background losses were reduced to 2dB/km at 1200nm.
Conference Paper
The article presents our study of the influence of drawing conditions on the background attenuation of alumosilicate fibers produced with vapour doping technique. First, a theoretical background is given to describe the mechanisms and influences on attenuation in alumosilicate fibers. Second, we present our experimental results of the influence of...
Conference Paper
В статье представлены наши исследования влияния условий вытяжки на уровень серых потерь в алюмосиликатных волокнах, полученных по технологии парофазного легирования. Во-первых, описаны теоретические предпосылки для описания механизмов, влияющих на затухание в алюмосиликатных волокнах. Во-вторых, мы представили наши экспериментальные результаты влия...
Conference Paper
Vanadium-doped fibers were produced by the flash vaporization process. The vanadium-doped core was heated by amplifier pump laser, which created opportunities for the designing of various fiber-thermo-optic devices, such as path-length modulators and sensors.
Article
This paper presents an all-fiber, fully-optically controlled, optical-path length modulator based on highly absorbing optical fiber. The modulator utilizes a high-power 980 nm pump diode and a short section of vanadium-co-doped single mode fiber that is heated through absorption and a non-radiative relaxation process. The achievable path length mod...
Conference Paper
Vapor phase doping process, based on chelate doping and MCVD, has been optimized and improved to permit fabrication of uniform, very large core diameter Yb/Al-codoped laser optical fiber preforms. Some measurement results are presented.
Article
This paper presents an all-optically controlled, all-fiber optical path-length modulator. The presented system takes advantage of the heating effect induced within vanadium-doped fiber through laser excitation. It can be applied in various applications, for example in white-light interferometry. The system consists of a Michelson interferometer wit...
Article
The reactivity of the relatively inert surfaces of iron-oxide magnetic nanoparticles can be significantly improved by coating the surfaces with silica. Unfortunately, however, this nonmagnetic silica layer tends to dilute the magnetic properties of the nanoparticles. Therefore, the silica layer should be as continuous, homogeneous, and as thin as p...
Article
The aim of this study was to attach a model drug (naproxen) onto superparamagnetic iron oxide nanoparticles (SPION). First, SPION were coated with thin layer of silica that contained micropores. We demonstrated that such surface functionalization could be optimized by the use of citric acid which prevented SPION agglomeration during the procedure....
Article
Superparamagnetic maghemite nanoparticles were functionalized with 3-aminopropyl triethoxy silane (APS). The influence of the different experimental parameters (temperature, pH, and reactant concentration) on the efficiency of the APS bonding directly to the maghemite nanoparticles or after their coating with a thin layer of silica was systematical...
Article
Bifunctional nanocomposites possessing superparamagnetism and traceability with optical methods were prepared. The superparamagnetic properties were achieved by introducing highly concentrated, ca. 13 nm-sized maghemite (γ-Fe2O3) nanoparticles into a silica matrix based on tetraethylorthosilicate (TEOS) and bis-1,2-(triethoxysilyl)ethane (BTSE). Tr...
Article
Composite nano-particles of superparamagnetic maghemite particles coated with a thin layer of silica are very promising material for biomedical applications. The magnetic core of the composite nano-particles allows manipulation of particles with external magnetic field while the silica shell allows additional bonding of molecules to the surface. Di...
Article
The aim of this study was to be able to reversibly bind histidine-rich proteins to the surface of maghemite magnetic nanoparticles via coordinative bonding using Zn ions as the anchoring points. We showed that in order to adsorb Zn ions on the maghemite, the surface of the latter needs to be modified. As silica is known to strongly adsorb zinc ions...
Article
Full-text available
Stable suspensions of superparamagnetic iron oxide nanoparticles in water (water-based ferrofluids) were prepared using citric acid (CA) as a surfactant. The influences of different factors on the amount of nanoparticles in a stable suspension were systematically studied. These factors, including the temperature, the pH value and the concentration...
Article
In this paper we describe the synthesis of maghemite nanoparticles coated with silica. The process was divided into three separate steps. In first step we have synthesized particles with co-precipitation of Fe 2+ and Fe 3+ ions. In the second step the particles were coated with citric acid in order to prevent agglomeration and dispersed in water. T...

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