DESIGN AND FABRICATION OF SPECIAL PHOTONIC CRYSTAL FIBERS WITH HIGH COUPLING OF THE FUNDAMENTAL MODE TO LEAKY MODES FOR REFRACTIVE INDEX

Johan Sebastian Buriticá Bolaños (2023, [Tesis de maestría])

"This work explores the possibility of implementing a detection mechanism in optical fibers called “Lossy Mode Resonance” (LMR), which has begun to grow in popularity because, compared to other similar detection mechanisms in the area of optical fibers, has high flexibility with respect to its implementation."

Crystal Fiber sensor Leaky modes LMR CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA FIBRAS ÓPTICAS FIBRAS ÓPTICAS

GENERATION OF LG VECTOR MODES WITH ULTRAHIGH STABILITY BASED ON COMPLEX AMPLITUDE MODULATION IN AN ON-AXIS CONFIGURATION

Gloria Elizabth Rodríguez García (2023, [Tesis de maestría])

"This thesis presents a novel technique for generating vector beams using complex amplitude modulation (CAM) in an on-axis configuration. The holograms used to generate the beams were created using the Mathlab software and displayed on a reflective spatial light modulator (SLM). The main goal of this research was to address both the purity and stability of the beams during generation and propagation, introducing a quantitative approach to assess their stability. As a proof-of-concept, Laguerre-Gaussian vector beams have been generated and characterized using Stokes polarimetry with the proposed experimental set up."

Structured light Laguerre-Gauss vector beams Stokes polarimetry Beam generation Spatial light modulators CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA OPTICA FÍSICA OPTICA FÍSICA

Estudios de la reflectancia especular y difusa en el esparcimiento de luz por superficies aleatorias metálicas rugosas

Study of the specular and diffuse reflectance in the scattering of light from random rough metallic surfaces

Alma Georgina Navarrete Alcalá (2003, [Tesis de doctorado])

En este trabajo de tesis se presentan resultados experimentales de la reflectividad y de la distribución angular de la parte incoherente del coeficiente diferencial de reflexión en el esparcimiento de luz por superficies rugosas aleatorias uni y bidimensionales. Las mediciones fueron hechas para las polarizaciones s y p. Las muestras fueron fabricadas en fotorresina y metalizadas con oro. Los perfiles de las superficies constituyen una buena aproximación a procesos aleatorios gaussianos con funciones de correlación gaussianas. Para incluir casos en los que el detalle lateral de la rugosidad de la superficie es menor o comparable a la longitud de onda de la luz, las mediciones fueron hechas en el infrarrojo a las longitudes de onda 5.5 y 10.6 um. Asimismo, se utilizaron superficies rugosas con desviaciones estándar de alturas de una pequeña fracción de la longitud de onda. La parte coherente del coeficiente diferencial de reflexión (reflectividad) es comparada con resultados de tres teorías perturbativas (de amplitudes pequeñas, de fase y de autoenergía) y con resultados basados en la aproximación de Kirchhoff. Además, para las superficies unidimensionales se hace también la comparación con similitudes numéricas rigurosas del problema. Para la parte incoherente se hace la comparación de los resultados experimentales con resultados basados en la aproximación de Kirchhoff y con las teorías perturbativas de amplitudes pequeñas y de fase. Al igual que para la parte coherente, para las superficies unidimensaionales se hace la comparación con simulaciones numéricas rigurosas del problema.

Luz - Esparcimiento, Polarización CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA OPTICA FÍSICA OPTICA FÍSICA

IMPLEMENTATION OF A PHOTON PAIRS SPECTRAL CHARACTERIZATION SYSTEM

Oscar Alejandro Ramírez Espinosa (2023, [Tesis de maestría])

"Implementación de un sistema de caracterización espectral, para procesos de generación de pares de fotones. En el se caracterizan los procesos de Four Wave Mixing contra-polarizado y contra-propagante. Junto con las caracteristicas del sistema."

Four-wave mixing Correlaciones Fibras ópticas Contra-propagante INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS OTRAS ESPECIALIDADES TECNOLÓGICAS

GENERAL STUDY OF CLASSICAL AND NONCLASSICAL CONTRIBUTIONS OF TWO PHOTON ABSORPTION PROCESS IN ORGANIC MOLECULES

Freiman Estiven Triana Arango (2023, [Tesis de doctorado])

"Two-photon absorption (TPA), a nonlinear optical phenomenon, is gaining attention for applications like laser scanning, microscopy, and therapy. Recent research explores entangled two photon absorption (ETPA) using correlated photons but faces debates regarding its magnitude and detection. This study introduces a novel method using changes in Hong-Ou-Mandel (HOM) interferogram visibility to probe ETPA's presence. It employs Rhodamine B dye and entangled photons at around 800nm to investigate conditions conducive to observing ETPA-induced changes. This innovative approach distinguishes genuine ETPA signals from linear optical losses often masquerading as ETPA effects, addressing a significant field challenge."

Two-photon absorption Entangled two-photon absorption Hong-Ou-Mandel HOM dip visibility Joint Spectral Intensity Entangled photons CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA FÍSICA ÓPTICA OPTICA NO LINEAL OPTICA NO LINEAL

Tensile behavior of 3D printed polylactic acid (PLA) based composites reinforced with natural fiber

Eliana M Agaliotis BALTAZAR DAVID AKE CONCHA ALEJANDRO MAY PAT Juan Pablo Morales Arias Celina Bernal Alex Valadez González Pedro Jesús Herrera Franco Gwenaelle Proust JUAN FRANCISCO KOH DZUL José Gonzalo Carrillo Baeza Emmanuel Alejandro Flores Johnson (2022, [Artículo])

Natural fiber-reinforced composite (NFRC) filaments for 3D printing were fabricated using polylactic acid (PLA) reinforced with 1–5 wt% henequen flour comprising particles with sizes between 90–250 μm. The flour was obtained from natural henequen fibers. NFRCs and pristine PLA specimens were printed with a 0° raster angle for tension tests. The results showed that the NFRCs’ measured density, porosity, and degree of crystallinity increased with flour content. The tensile tests showed that the NFRC Young’s modulus was lower than that of the printed pristine PLA. For 1 wt% flour content, the NFRCs’ maximum stress and strain to failure were higher than those of the printed PLA, which was attributed to the henequen fibers acting as reinforcement and delaying crack growth. However, for 2 wt% and higher flour contents, the NFRCs’ maximum stress was lower than that of the printed PLA. Microscopic characterization after testing showed an increase in voids and defects, with the increase in flour content attributed to particle agglomeration. For 1 wt% flour content, the NFRCs were also printed with raster angles of ±45° and 90° for comparison; the highest tensile properties were obtained with a 0° raster angle. Finally, adding 3 wt% content of maleic anhydride to the NFRC with 1 wt% flour content slightly increased the maximum stress. The results presented herein warrant further research to fully understand the mechanical properties of printed NFRCs made of PLA reinforced with natural henequen fibers. © 2022 by the authors.

POLYLACTIC ACID (PLA) NATURAL FIBER HENEQUEN FIBER NATURAL FIBER REINFORCED COMPOSITE (NFRC) ADDITIVE MANUFACTURING 3D PRINTING MECHANICAL PROPERTY INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES PROPIEDADES DE LOS MATERIALES PROPIEDADES DE LOS MATERIALES

High-throughput plot-level quantitative phenotyping using convolutional neural networks on very high-resolution satellite images

Francisco Pinto Matthew Paul Reynolds Robert Furbank (2024, [Artículo])

Deep Learning Object-Based Image Analysis Optical Imagery CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA AGRICULTURE IMAGE ANALYSIS PLANT BREEDING REMOTE SENSING MACHINE LEARNING

SISTEMA MECATRÓNICO PARA LA MEDICIÓN DE ÁNGULO DE BREWSTER Y ABELES-BREWSTER

Oscar Silva (2023, [Tesis de maestría])

"Desarrollo de un sistema opto-mecatrónico theta-2theta, el cual realiza mediciones de ángulo de Brewster y Abelès-Brewster para obtener la caracterización de materiales transparentes y películas delgadas dieléctricas."

Índice de refracción Sensor óptico LabVIEW Ángulo de Brewster Técnica de Abelès-Brewster Opto-mecatrónica INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE LA INSTRUMENTACIÓN INSTRUMENTOS ÓPTICOS INSTRUMENTOS ÓPTICOS