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1Université Côte d'Azur, CNRS, INPHYNI, France; 2Aix Marseille Univ, CNRS, Centrale Med, FSCM, CP2M, Marseille, France; 3MINES Paris, PSL University, CEMEF - Centre for material forming, CNRS UMR 7635, CS 10207, rue Claude Daunesse 06904 Sophia Antipolis Cedex, France
“Girl with a Pearl Earring”, nicknamed the Mona Lisa of the North, is considered one of Johannes Vermeer's masterpieces. The painting represents the imaginary portrait (it is a tronie) of a young woman, sublimated by the Dutch painter's masterful use of light and technical mastery. What also attracts attention in this painting, and sets it apart from other portraits, is the presence of this pearl, a presence that seems to hesitate between the brilliance of reflected light and discretion as it blends into its surroundings.
This painting and pearl dilemma can be seen as an allegory for nanoparticles in optical fibers. While the leitmotif of glass for optical fibers is to be as homogeneous as possible, optical fibers containing nanoparticles are distinguished by the deliberate introduction of heterogeneities into the glass. Induced light scattering introduces a dilemma: it must be minimized for applications such as lasers, or enhanced for sensors.
In this presentation, we will discuss the different processes for preparing optical fibers containing nanoparticles. In particular, we'll show how, thanks to the use of light (a femtosecond laser), it's possible to control the characteristics of nanoparticles in the core of optical fibers.
4:00pm - 4:15pm
On-fringe optical trapping of dielectric microparticles in air
Clémence Magguilli, Jochen Fick
Institut Néel / CNRS, France
Optical trapping in air of dielectric micro-spheres is reported using a dual fiber optical tweezers. The spheres are trapped on the interference fringes created by the two counter-propagating optical trapping beams. The use of polarization maintaining fibers allowed us to obtain very high and reproducible trapping efficiencies.
4:15pm - 4:30pm
Local Colour Control on a Soft Continuum Robot by Bending Embedded Optical Fibre Dissipation Sensor Pairs
Colour as an information carrier widely exists in nature for camouflage and signalling, inspiring recent interest in bio-inspired colour-changing materials. This study introduces an optical fibre dissipation sensor pair integrated into a soft continuum robot, allowing for dynamic colour expression in response to shape changes. The leaked light was used for real-time colour changes to interact with environmental changes. The system successfully demonstrated colour mixing and transitions during bending, offering combined sensing and visual signalling for applications for visual strain expression.
4:30pm - 4:45pm
Double temperature detection with a two-LPGs Mach- Zehnder interferometer
Niccolò Marcucci, Gabriele Frigenti, Francesco Baldini, Cosimo Trono
Istituto di Fisica applicata Nello Carrara - Consiglio Nazionale delle Ricerce, Italy
In this work, we present a novel method to accurately retrieve
temperature information from two LPGs arranged in sequence within a Mach-
Zehnder interferometric configuration. By carefully analysing specific spectral
features and formulating the inversion problem in an unconventional way, we
successfully separate the contributions of each grating, enabling reliable sensing
