10:45am - 11:15amInvitedID: 429
/ TOM10 S6: 1
TOM 10 Applications of Optics and Photonics
Invited - Novel Forward Brillouin Scattering measurement technique based on high-Q fiber ring resonator.
Anna I. Garrigues-Navarro1, Martina Delgado-Pinar1,2, Antonio Díez1,2, Miguel V. Andrés1,2
1Laboratory of Fiber Optics, ICMUV, Universitat de València, Spain; 2Departament de Física Aplicada i Electromagnetisme, Universitat de València, Spain
The conventional detection of Forward Brillouin Scattering (FBS) in optical fibers requires of interferometric techniques using lengths of tens of meters. In this paper, we demonstrate an alternative approach that provides efficient and high-resolution detection of FBS signals, while using just a 20 cm length section of bare fiber. It consists of a pump and probe scheme using a fiber ring resonator as the interrogation system of the mechanical vibration, which modulates the resonances. The result is an amplitude modulated optical trace which allows the detection of resonances R_(0,m) and TR_(2,m).
11:15am - 11:30amID: 235
/ TOM10 S6: 2
TOM 10 Applications of Optics and Photonics
Low Coherence Interferometry Measurement: An Algorithm for fast processing with low noise and phase linearisation
Paulo Robalinho, António Rodrigues, Susana Novais, António B. Lobo Ribeiro, Susana Silva, Orlando Frazão
INESC TEC, Portugal
This work proposes a signal processing algorithm to analyse the optical signal from a Low
Coherence Interferometric (LCI) system. The system uses a Mach-Zehnder (MZ) interferometer to interrogate
a Fabry-Perot cavity, working as an optical sensor. This algorithm is based on the correlation and convolution
operations, which allows the signal to be reconstructed based on itself, as well as, on the linearization of the
signal phase, allowing the non-linearities of the actuator incorporated on the MZ interferometer to be
compensated. The results show a noise reduction of 30 dB in the signal acquired. As a result, a reduction of
8.2 dB in the uncertainty of the measurement of the physical measurand is achieved. It is also demonstrated
that the phase linearization made it possible to obtain a coefficient of determination (namely, R-squared)
higher than 0.999.
11:30am - 11:45amID: 278
/ TOM10 S6: 3
TOM 10 Applications of Optics and Photonics
Wavefront folding interferometer for single-shot lensless imaging
Atri Halder1, Henri Partanen2, Matias Koivurova1
1University of Eastern FInland, Finland; 2Dispelix Oy, Finland
We have developed a fast, high-resolution, and single-shot lensless imaging technique based on the wavefront folding interferometer (WFI). Considering a stationary, quasimonochromatic, and quasihomogeneous source of light we studied the effect of spatial coherence on the retrieved image quality. Moreover, a thorough investigation of the resolution and the semi-infinity depth of focus of the imaging system was performed and demonstrated experimentally.
11:45am - 12:00pmID: 298
/ TOM10 S6: 4
TOM 10 Applications of Optics and Photonics
Terahertz waveform synthesis in scattering systems via nonlinear ghost imaging
Vittorio Cecconi1, Vivek Kumar2, Juan Sebastian Totero Gongora1, Antonio Cutrona1, Luke Peters1, Luana Olivieri1, Jacopo Bertolotti3, Alessia Pasquazi1, Marco Peccianti1
1Emergent Photonics Research Centre and Dept. of Physics, Loughborough University, Loughborough, UK; 2Emergent Photonics (EPic) Laboratory, Dept. of Physics and Astronomy, University of Sussex, Brighton, UK; 3Department. of Physics and Astronomy, University of Exeter, Exeter, UK
Terahertz Nonlinear Ghost Imaging introduces a groundbreaking method for object sampling at spatial-temporal levels, achieving super-resolution (i.e., beyond the diffraction limit). Our theoretical and experimental endeavour seeks to leverage this technique, enabling arbitrary field-level waveform manipulation through intricate propagation in scattering environments. This approach facilitates essential agile waveform adjustment, made possible through near-field interactions between terahertz sources and scattering media.
12:00pm - 12:15pmID: 259
/ TOM10 S6: 5
TOM 10 Applications of Optics and Photonics
Applied Optics in the Development of Smart Road Markings
Orlando Lima Jr.1, Iran Rocha Segundo1, Edson Reis2, Laura Mazzoni3, Manuel F. M. Costa1, Elisabete Freitas1, Joaquim Carneiro1
1University of Minho, Portugal; 2Federal University of Pernambuco; 3University of S. Paulo
Road markings (RM) consist of two distinct layers: the paint layer and the retroreflective layer. Together, they function as system and are essential features for road safety. Recent studies have been centred on elevating these systems to a smarter level, imbuing them with novel functionalities, increasing their visibility, service life and road safety. These new capabilities encompass photoluminescence, anti-aging, self-cleaning, and thermochromism. The aim of this study is to review the advancements and highlight potential opportunities for RM, the materials employed, functionalization techniques, and the key outcomes achieved.
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