Repositorio Institucional de CIO (Centro de Investigaciones en Optica)
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OPTICAL BIOSENSING PLATFORM ASSISTED BY ARTIFICIAL INTELLIGENCE, DEEP LEARNING
Full text link"This doctoral research aimed to enhance biosensing systems using artificial intelligence, specifically Deep Learning, by implementing neural models that improved their analytical performance. In particular we studied a nanophotonic immunoassay for diagnosing bacterial vaginosis, achieving clinical sensitivity and specificity of approximately 96.29% (n = 162). In this context, this thesis demonstrates that an AI-assisted real-time biosensing platform eliminates the need for biomarker concentration as well as threshold determination, and also enhances clinical sensitivity and specificity, reaching up to 100%.
DESIGN OF AN INTEGRATED PHOTON PAIR SOURCE BASED ON COUNTER-PROPAGATING SPONTANEOUS FOUR WAVE MIXING IN A MICRORING RESONATOR
Full text link"In this work, we present a novel design of a visible-telecom photon pair source based on Counter-Propagating Spontaneous Four Wave Mixing (CP-SFWM) within a silicon nitride microring resonator. We detail the design process, including the determination of geometrical parameters, and provide simulations of the source’s emission rate and spectral properties. Our results underscore the potential of the CP-SFWM approach as a promising alternative for integrated on-chip photon pair generation.
TOWARDS UAV TELEOPERATION BY MEANS OF VIRTUAL REALITY
Full text link"This study presents the development of virtual environments as control centers for remoteteleoperation tasks of unmanned aerial vehicles (UAVs). Initially, our focus lies on reconstructing outdoor and indoor environments using a ZED mini stereo camera and reconstructing them through point cloud techniques.
MÁQUINA DE ENSAYOS PARA PRUEBAS MECÁNICAS EN MATERIAL COMPUESTO Y HUESO CORTICAL COMPARADOS CON INTERFEROMETRÍA HOLOGRÁFICA
Full text link"Este trabajo compara un material compuesto de bajo costo con propiedades mecánicas similares al hueso cortical, proponiéndolo como alternativa para prótesis de extremidades inferiores. Aunque los materiales compuestos suelen ser costosos y de uso limitado, se identificó una combinación de refuerzo y matriz con respuesta comparable en pruebas de compresión y tensión. Para estas pruebas, se diseñó y construyó una máquina de ensayos universal integrada con un sistema óptico de interferometría holográfica, detallando su desarrollo mecánico, electrónico y de control.
INTEGRATED MICRORING RESONATORS FOR PHOTONIC QUANTUM TECHNOLOGIES
Full text link"Photonic quantum technology is an emerging field that combines integrated photonics with the principles of quantum mechanics to manipulate and control photonic quantum states for applications such as computing, communication, and sensing. These technologies exploit quantum phenomena, such as superposition, entanglement, and quantum interference, to perform tasks that are impossible or inefficient using classical systems. Moreover, photonic quantum devices require three main stages for their full implementation: generation, manipulation, and detection of quantum states of light. In this work, we focus on the generation of quantum states of light by engineering integrated photon sources that exploit the Spontaneous Four Wave Mixing (SFWM) process. We describe the theoretical background and the detailed process for designing two different integrated photon sources based on microring resonators in a Si3N4 platform for various applications.
HACES HÍBRIDOS VECTORIALES HERMITE-LAGUERRE-GAUSS CON MAYOR RESISTENCIA A LA TURBULENCIA ATMOSFÉRICA
Full text link"En este trabajo se generó, de manera experimental, un nuevo tipo de haz vectorial híbrido, llamado “Hermite-Laguerre-Gauss (HLGVB)”, en presencia de la turbulencia atmosférica. Para su generación, se implementó el uso de un montaje óptico que consta principalmente de un láser He-Ne como fuente de luz, un dispositivo de modulación espacial de cristal líquido SLM y un interferómetro de camino común tipo Sagnac. Para darle forma y estructura a los modos vectoriales, se implementó la técnica de holografía digital utilizando el método de modulación compleja de amplitud y en conjunto con el software Matlab.
ANALYSIS AND CORRECTION OF THE ADDITIVE PHASE EFFECT GENERATED BY POWER CHANGE IN A MACH-ZEHNDER INTERFEROMETER INTEGRATED TO AN OPTICAL TRAP
Full text link"Immersion microscope objectives make it possible to increase the gradient forces of a beam focused through them, thus forming an Optical Trap (OT). However, many studies on microscopic interferometry neglect the contributions of different optical materials of the system that are also exposed to laser radiation. In this work, a Mach-Zehnder interferometer and an OT were coupled. Here an individual analysis of the media through which light travels and which are present in the experimental setup is carried out to determine their optical contributions when a change in laser power is applied.
CERTIFICATION OF CONTINUOUS VARIABLE BIPARTITE AND TRIPARTITE QUANTUM ENTANGLEMENT AND STEERING IN A SYSTEM WITH A NONLINEAR INTERACTION
Full text link"In recent years, there has been great interest and effort to develop quantum technologies that utilize quantum nonlocal correlations, such as entanglement and steering. Here, we investigate quantum entanglement and steering generated by an intracavity down conversion process. We certify bipartite, tripartite and genuine tripartite entanglement, as well as bipartite one-way and two-way steering, and full tripartite two-way steering inseparability in quadrature operators in the frequency domain by using different entanglement and steering criteria. We also investigate the distribution of these quantum corrrelations among the different parties of the system through the monogamy relations.
INSPECTION OF PARABOLIC TROUGH COLLECTORS USING DIGITAL IMAGE PROCESSING
Full text link"The parabolic-trough collectors are emergent technology that solves thermal energy problems because they take advantage of solar energy, however, those systems are outdoor, making it easy to become dirt. Currently, the inspection of dirt is performed manually. In this work, a system able to detect different dust deposition levels on the receiver tube of the parabolic-trough collector (PTC), using a CNN model, has been proposed. The proposed system has shown a very good performance, achieving an overall accuracy of 0.91 and F1-measure of 0.91 (σ = 0.04), making it a good alternative for dust classification in PTCs.
DESIGN AND DEVELOPMENT OF A UAV WITH HYBRID FLIGHT CAPABILITIES FOR ELECTRICAL TOWER INSPECTION
Full text link"This document presents the flight control and stability of the tail-sitter UAV especially focused during the hover mode because, during this flight mode, the wing is oriented vertically, and external wing gusts extremely affect the aerodynamics of the aircraft causing undesired disturbances. To mitigate these external and non-desired forces, we propose a state and disturbance observer which will help the main flight control to stabilize the UAV’s position and attitude. In addition, is presented other similar cases assessing an adaptive control for a fully actuated UAV, NNs for electrical tower detection and disturbance estimator. And finally, the construction of a tail-sitter UAV prototype.