8:30am - 9:00amINVITEDSensing applications based on all-optical excitation and interrogations of forward stimulated Brillouin scattering
Martina Delgado Pinar
University of Valencia, Spain
Authors: Carlos Álvarez-Ocampo, Juan Julián-Barriel, Anna I. Garrigues-Navarro, Aleksander S. Paterno, Martina Delgado-Pinar, Antonio Díez, Jose Luis Cruz, Miguel V. Andrés
9:00am - 9:15amAnalysing the applicability of twisted nematic liquid crystals in non-classical Mueller polarimetry systems
Monika Salamaga, Władysław Artur Woźniak
Wrocław University of Science and Technology, Poland
In the classical polarimetric solutions, the light polarization states generator (PSG) and analyzer (PSA) are placed on opposite sides of the medium. Such a solution is difficult to realized and even impossible for some media. An interesting alternative are configurations in which light passes through the PSG, the test medium and, after reflecting off the mirror, comes back again through the medium and the same module (PSG) acting as a PSA. This arrangement can be named one-way double pass Mueller polarimeter. Crucial to the system capabilities is the single module PSG/PSA design. This work verifies the possibility of using in them twisted nematic liquid crystals (TNLCs). There are noticeable differences in the quality of the polarimeter depending on the used components (linear polarizer with a single TNLC, two TNLCs or a combination of TNLCs with a liquid crystal variable retarder). Based on the measurement results, numerical models were created and optimized by minimizing condition number to find the best set of PSG/PSA configurations. The one-way double pass polarimetric systems were then tested in the laboratory. The results show that the use of TNLCs overcomes some measurement limitations and increases the system stability, compared to other solutions proposed in the literature.
9:15am - 9:30amA non-invasive multimodal approach to understand plastic degradation in design objects
Sabrina Samela1, Paulina Guzman Garcia Lascurain1, Alessia Di Benedetto1, Luca Andena2, Irene Bargagli3, Francesca Rosi3, Daniela Comelli1
1Department of Physics, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy; 2Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy; 3Istituto di Science e Tecnologie Chimiche “G. Natta” (CNR-SCITEC), Via Elce di Sotto 8, 016280, Perugia, Italy
This study explores the early detection of degradation in plastic-based cultural heritage objects using non-invasive spectroscopic techniques. The results on artificially aged ABS specimens revealed degradation markers at low exposure levels. Changes in polymer composition were then correlated with mechanical stiffening and increased friction. The approach offers valuable tools for in situ monitoring and preventive conservation of modern art and design objects.
9:30am - 9:45amInvestigations into a free-form grinding process chain at the example of a beam shaping element
Sebastian Henkel, Marcel Binder, Jens Bliedtner, Aliaksei Kobylinskiy, Robert Brunner
Ernst-Abbe University of Applied Sciences Jena, Germany
The production of optical free-form surfaces requires a high level of precision and surface quality. The process chain presented combines pre-grinding, fine grinding and ultra-fine grinding using a 5-axis CNC machine in order to achieve high shape accuracy and surface quality. The presented process chain makes it possible to produce free-form surfaces with high geometric precision and optical qualities.
9:45am - 10:00amQuantum walk realization with tunable dichroic liquid crystal metasurface
Paola Savarese1, Sarvesh Bansal1, Maria Gorizia Ammendola1,2, Francesco Di Colandrea1, Lorenzo Amato3,4, Raouf Barboza5, Bruno Piccirillo1, Lorenzo Marrucci1,6, Filippo Filippo Cardano1
1Dipartimento di Fisica, Università degli Studi di Napoli Federico II, Complesso Universitario di Monte Sant’Angelo, Via Cintia, 80126 Napoli, Italy.; 2Scuola Superiore Meridionale, Via Mezzocannone, 4, 80138 Napoli, Italy; 3Condensed Matter Theory Group, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland.; 4Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland.; 5Dipartimento di Scienze e Ingegneria della Materia, dell’Ambiente ed Urbanistica, Università Politecnica delle Marche, Via Brecce Bianche, 60131 Ancona, Italy.; 6CNR-ISASI, Institute of Applied Science and Intelligent Systems, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy.
In recent years, non-Hermitian photonics has emerged as a prominent field, exploring open systems with complex eigenvalues. We propose simulating non-Hermitian dynamics via non-unitary photonic quantum walks, leveraging liquid-crystal technology for manipulating polarization and light amplitude.
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