Dr. Augusto García-Valenzuela Profile

Dr. Augusto García-Valenzuela

at Instituto de Ciencias Aplicadas y Tecnología

SPIE Involvement:

Author

Publications (37)

SPIE Journal Paper | 23 May 2016

Sensitivity of optical reflectance to the deposition of plasmonic nanoparticles and limits of detection

Omar Vázquez-Estrada, Gesuri Morales-Luna, Alejandro Reyes-Coronado, Alipio Calles-Martínez, Augusto García-Valenzuela

JNP, Vol. 10, Issue 02, 026019, (May 2016) https://doi.org/10.1117/12.10.1117/1.JNP.10.026019

KEYWORDS: Nanoparticles, Particles, Reflectivity, Gold, Silver, Polarization, Plasmonics, Reflection, Plasmons, Glasses

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Proceedings Article | 20 August 2015 Paper

Feasibility of sizing metallic nanoparticles in concentrated suspensions from effective optical properties

G. Morales-Luna, R. Márquez-Islas, O. Vázquez-Estrada, H. Contreras-Tello, A. García-Valenzuela

Proceedings Volume 9556, 95561I (2015) https://doi.org/10.1117/12.2187032

KEYWORDS: Particles, Nanoparticles, Refractive index, Reflectivity, Copper, Scattering, Liquids, Spherical lenses, Water, Opacity

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Proceedings Article | 20 August 2015 Paper

Optical reflectivity as an inspection tool for metallic nanoparticles deposited randomly on a flat substrate

Omar Vázquez-Estrada, Gesuri Morales-Luna, Alipio Calles-Martínez, Alejandro Reyes-Coronado, Augusto García-Valenzuela

Proceedings Volume 9556, 95561H (2015) https://doi.org/10.1117/12.2186863

KEYWORDS: Particles, Polarization, Nanoparticles, Spherical lenses, Silver, Gold, Refractive index, Sensors, Light scattering, Glasses

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Proceedings Article | 27 August 2014 Paper

The refractive index of non-absorbing nanofluids and applications

Augusto García-Valenzuela, Humberto Contreras-Tello, C. Sánchez-Pérez, R. Márquez-Islas, R. Barrera

Proceedings Volume 9173, 91730C (2014) https://doi.org/10.1117/12.2064153

KEYWORDS: Particles, Refractive index, Liquids, Nanoparticles, Light scattering, Scattering, Interfaces, Water, Polymethylmethacrylate, Electromagnetism

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Proceedings Article | 20 March 2014 Paper

On the spectral response of thick piezoelectric capacitive sensors for arrays in imagenology applications

B. Reyes-Ramírez, C. Garcia-Segundo, A. García-Valenzuela

Proceedings Volume 9040, 90401J (2014) https://doi.org/10.1117/12.2043789

KEYWORDS: Sensors, Ferroelectric polymers, Ultrasonography, Ultrasonics, Signal generators, Photoacoustic spectroscopy, Tomography, Imaging arrays, Composites, Fourier transforms

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SPIE Journal Paper | 1 May 2011

Comprehensive analysis of the diffuse-to-near-normal-viewing reflectance factor of paint films

Augusto Garcia-Valenzuela, Fabio Cuppo, Jose Olivares, Julian Galvan-Miyoshi

OE, Vol. 50, Issue 05, 053602, (May 2011) https://doi.org/10.1117/12.10.1117/1.3574069

KEYWORDS: Reflectivity, Interfaces, Sensors, Reflection, Surface roughness, Optical spheres, Integrating spheres, Collimation, Optical engineering, Coating

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Proceedings Article | 3 December 2009 Paper

Fast measurement of the refractive-index dispersion of dilute liquid solutions of absorbing molecules

Elizareth Hernández-Sánchez, Humberto Contreras-Tello, Celia Sánchez-Pérez, Augusto García-Valenzuela

Proceedings Volume 7499, 74990E (2009) https://doi.org/10.1117/12.851114

KEYWORDS: Reflectivity, Refractive index, Molecules, Water, Glasses, Polarization, Liquids, Prisms, Absorption, Rhodamine

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Proceedings Article | 5 August 2009 Paper

On the characterization of a random monolayer of particles from coherent optical reflectance

F. Alarcón-Oseguera, M. Peña-Gomar, A. García-Valenzuela, F. Castillo, E. Pérez

Proceedings Volume 7386, 738612 (2009) https://doi.org/10.1117/12.839606

KEYWORDS: Particles, Reflectivity, Light scattering, Scattering, Reflection, Data modeling, Refractive index, Glasses, Adsorption, Laser scattering

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Proceedings Article | 16 May 2007 Paper

Determination of the dielectric constant of coatings with a capacitance probe

A. Guadarrama-Santana, A. García-Valenzuela

Proceedings Volume 6422, 64221N (2007) https://doi.org/10.1117/12.742372

KEYWORDS: Capacitance, Electrodes, Dielectrics, Spherical lenses, 3D metrology, Atrial fibrillation, Finite element methods, Optical spheres, Sensors, Cadmium

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Proceedings Article | 16 May 2007 Paper

Dispersion and refractive index measurements of diluted solutions with a double prism refractometer

Víctor Leyva-García, Celia Sánchez-Pérez, Augusto García-Valenzuela

Proceedings Volume 6422, 64221F (2007) https://doi.org/10.1117/12.742353

KEYWORDS: Refractive index, Prisms, Water, Calibration, Spectrophotometry, Refraction, Ionization, Beam analyzers, Light sources, Oxidation

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Proceedings Article | 15 May 2007 Paper

Optical-integrated NH3 sensor design based on WO3 thin films: influence of gas adsorption and chromic effects

Hugo Lazcano Hernández, Celia Sánchez Pérez, Augusto García Valenzuela, Alejandro Esparza García, Marco Camacho López

Proceedings Volume 6422, 642213 (2007) https://doi.org/10.1117/12.742303

KEYWORDS: Refractive index, Sensors, Transmittance, Adsorption, Waveguides, Glasses, Temperature metrology, Atmospheric propagation, Thin films, Optical design

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SPIE Journal Paper | 1 April 2007 Open Access

Photometric principle for passive optical range sensors

Augusto García Valenzuela, H. Valenzo-Aoki, Celia Sanchez-Perez, V. Argueta-Diaz

OE, Vol. 46, Issue 04, 040505, (April 2007) https://doi.org/10.1117/12.10.1117/1.2721533

KEYWORDS: Sensors, Iris recognition, Signal detection, Photodetectors, Light emitting diodes, Optical components, Active optics, Active sensors, Distance measurement, Ranging

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SPIE Journal Paper | 1 June 2006 Open Access

Refractive index dispersion measurement of absorbing layers from transmittance spectra

Celia Sanchez-Perez, Augusto García-Valenzuela

OE, Vol. 45, Issue 06, 060504, (June 2006) https://doi.org/10.1117/12.10.1117/1.2208560

KEYWORDS: Refractive index, Transmittance, Water, Error analysis, Solids, Optical testing, Absorbance, Ocean optics, Thin films, Reflectivity

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Proceedings Article | 10 February 2006 Paper

Low-scale displacement sensor (multiple unities)

Angélica Ramírez-Ibarra, G. Eduardo Sandoval-Romero, Augusto García-Valenzuela, Salvador Palma-Vargas

Proceedings Volume 6046, 60462D (2006) https://doi.org/10.1117/12.674660

KEYWORDS: Mirrors, Sensors, Liquids, Oxides, Semiconductor lasers, Titanium, Solids, Visualization, Analytical research, Beam analyzers

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Proceedings Article | 10 February 2006 Paper

Refractive index determination of highly absorbing materials by oblique transmittance measurements

Celia Sánchez Pérez, Augusto García Valenzuela, Luis Castañeda Aviña, G. Eduardo Sandoval Romero

Proceedings Volume 6046, 60461V (2006) https://doi.org/10.1117/12.674601

KEYWORDS: Refractive index, Transmittance, Water, Absorbance, Spectroscopy, Liquids, Interfaces, Error analysis, Absorption, Thin films

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Proceedings Article | 31 March 2005 Paper

Planar glass integrated optical structure based on prism decoupling for sensing applications

Celia Sanchez-Perez, Elise Ghibaudo, Jean-Emmanuel Broquin, Augusto Garcia-Valenzuela, A. Esparza-Garcia, M. Camacho-Lopez

Proceedings Volume 5728, (2005) https://doi.org/10.1117/12.590590

KEYWORDS: Prisms, Waveguides, Refractive index, Thin films, Planar waveguides, Glasses, Integrated optics, Thin film deposition, Thin film devices, Raman spectroscopy

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Proceedings Article | 7 April 2004 Paper

Heat flux sensor based on photothermal beam deflection for thermal characterization of liquids

G. Sandoval-Romero, J. Hernandez-Cedillo, E. Martinez-Gomez, Augusto Garcia-Valenzuela, C. Sanchez-Perez, Juan Hernandez-Cordero

Proceedings Volume 5478, (2004) https://doi.org/10.1117/12.560994

KEYWORDS: Sensors, Liquids, Heat flux, Optoelectronic devices, Thermal optics, Remote sensing, Fiber optics sensors, Head, Fiber optics tests, Fiber optics

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Proceedings Article | 7 April 2004 Paper

Superluminescent fiber laser sources for fiber optics sensors

G. Sandoval-Romero, Juan Hernandez-Cordero, L. Sosa-Martinez, P. Ramos-Alvarez, Augusto Garcia-Valenzuela, C. Sanchez-Perez

Proceedings Volume 5478, (2004) https://doi.org/10.1117/12.560997

KEYWORDS: Fiber optics sensors, Fiber lasers, Optical fibers, Multiplexing, Gyroscopes, Sensors, Light sources

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Proceedings Article | 18 February 2004 Paper

Monitoring particle adsorption and thin film formation by laser reflectometry near the critical angle

Mary Carmen Pena-Gomar, Elias Perez, Augusto García-Valenzuela, Joan Anto i Roca

Proceedings Volume 5249, (2004) https://doi.org/10.1117/12.513508

KEYWORDS: Particles, Adsorption, Reflectivity, Reflection, Reflectometry, Water, Latex, Refraction, Glasses, Mirrors

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SPIE Journal Paper | 1 April 2003

Sensitivity analysis of angle-sensitive detectors based on a film resonator

Augusto Garcia-Valenzuela, Mary Pena-Gomar, Joel Villatoro

OE, Vol. 42, Issue 04, (April 2003) https://doi.org/10.1117/12.10.1117/1.1554406

KEYWORDS: Resonators, Sensors, Polarization, Diffraction, Prisms, Interfaces, Reflection, Beam splitters, Reflectivity, Signal detection

SPIE Journal Paper | 1 March 2003

Design of an optical probe based on angle scanning reflectometry near the critical angle

Mary Carmen Pena-Gomar, Augusto García-Valenzuela, Martha Rosete-Aguilar

OE, Vol. 42, Issue 03, (March 2003) https://doi.org/10.1117/12.10.1117/1.1542593

KEYWORDS: Reflectivity, Refractive index, Mirrors, Optical design, Prototyping, Modulators, Reflectometry, Sensors, Absorption, Water

Proceedings Article | 17 February 2003 Paper

Portable refractometer incorporating dynamic reflectometry for monitoring the complex index of refraction in nontransparent liquids

M. Pena-Gomar, G Pena-Gomar, Augusto Garcia-Valenzuela

Proceedings Volume 4833, (2003) https://doi.org/10.1117/12.473982

KEYWORDS: Reflectivity, Liquids, Mirrors, Reflectometry, Sensors, Refractive index, Water, Refraction, Prototyping, Particles

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In this work we present the development of an optical probe which can be used to measure the absolute value of the real and imaginary parts of the refractive index of transparent, opaque or turbid liquids indistinctly. The device can work as a portable, immersion-type, critical-angle refractometer or as a high resolution optical sensor to monitor physical or chemical processes in liquids. The instrument is based on scanning laser reflectometry and measures the reflectance angular-profile around the critical angle. It also measures directly the angle-differential profile of the reflectivity by dynamic reflectometry. For sensing variations of the RI, one can monitor in time either the reflectance or its angular derivative in the vicinity of the critical angle. The uncertainty of the instrument in measuring the real part of the RI can be 10^-6. The sensing resolution can be 10^-7 when monitoring the differential reflectivity. When the RI is harmonically modulated in time (of RI), it is possible to achieve a resolution as high as 10^-10. The applicability of the technique to turbid media consisting in suspension of particles is briefly discussed. We also show that the RI of liquid sample can be monitored through a physical or chemical process if the liquid is vigorously stirred. Regarding the instrument design, we use a novel mechanism to control the angle of incidence which allows to keep all components fixed (laser, detector, semi-cylindrical lens, angle modulator, and cables), except for a mirror and a collimating lens. It only requires linear displacements, for which a conventional micrometer is enough. This design is a considerable improvement over the typical laboratory arrangement used by several authors, and permits to have a portable, compact instrument with all the capabilities of the laboratory technique. The design offers a wide measurement range as to cover most water solutions. We believe the device offers an acceptable balance between size and stability. We give results obtained with an experimental prototype of the device. The aim of this work is a general overview of the foundations of the technique, the development of the sensor and some applications.

SPIE Journal Paper | 1 August 2002

Error analysis on measuring angle-differential profiles of optical reflectivity by dynamic reflectometry

Augusto Garcia-Valenzuela, M. Pena-Gomar

OE, Vol. 41, Issue 08, (August 2002) https://doi.org/10.1117/12.10.1117/1.1489052

KEYWORDS: Reflectivity, Sensors, Modulation, Error analysis, Charge-coupled devices, Signal detection, Reflectometry, Diodes, Modulators, Interfaces

SPIE Journal Paper | 1 July 2002

Measuring and sensing a complex refractive index by laser reflection near the critical angle

Augusto Garcia-Valenzuela, M. Pena-Gomar, C. Fajardo-Lira

OE, Vol. 41, Issue 07, (July 2002) https://doi.org/10.1117/12.10.1117/1.1483084

KEYWORDS: Reflectivity, Particles, Liquids, Modulation, Absorption, Refractive index, Glasses, Optical engineering, Sensors, Reflectometry

Proceedings Article | 29 December 2000 Paper

Optical device for sensing the index of refraction of liquids with high turbidity

M. Pena-Gomar, C. Fajardo-Lira, Martha Rosete-Aguilar, Augusto Garcia-Valenzuela

Proceedings Volume 4203, (2000) https://doi.org/10.1117/12.411747

KEYWORDS: Reflectivity, Liquids, Particles, Gaussian beams, Absorption, Optical components, Refractive index, Mirrors, Refraction, Scattering

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Proceedings Article | 2 September 1999 Paper

Optical sensing of absorbing and inhomogeneous media by AC-reflection near the critical angle

Augusto Garcia-Valenzuela, M. Pena-Gomar

Proceedings Volume 3878, (1999) https://doi.org/10.1117/12.361263

KEYWORDS: Reflectivity, Refractive index, Modulation, Refraction, Prisms, Sensors, Absorption, Collimation, Microopto electromechanical systems, Interfaces

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Proceedings Article | 2 September 1999 Paper

Sensitivity of (bio)-chemical sensors based on laser-excited surface plasmon resonance

Joel Villatoro, Augusto Garcia-Valenzuela

Proceedings Volume 3878, (1999) https://doi.org/10.1117/12.361280

KEYWORDS: Reflectivity, Sensors, Metals, Surface plasmons, Prisms, Optical sensors, Remote sensing, Refractive index, Dielectrics, Interfaces

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Proceedings Article | 4 December 1998 Paper

Guided beam deflection method: a novel alternative for designing integrated optical sensors

Joel Villatoro, Augusto Garcia-Valenzuela, Alfonso Serrano-Heredia

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328660

KEYWORDS: Sensors, Waveguides, Interferometry, Refractive index, Integrated optics, Optical design, Wave propagation, Gaussian beams, Ions, Modulation

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Proceedings Article | 4 December 1998 Paper

Theoretical assessment of optical reflectometry for film chemical-sensors

Augusto Garcia-Valenzuela, J. Saniger-Blesa, C. Garcia-Segundo

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328628

KEYWORDS: Reflectometry, Molecules, Dielectrics, Semiconductors, Thermography, Thin films, Reflection, Interference (communication), Information operations, Visible radiation

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SPIE Journal Paper | 1 June 1997

Approach to improve the angle sensitivity and resolution of the optical beam deflection method using a passive interferometer and a Ronchi grating

Augusto Garcia-Valenzuela, Rufino Diaz-Uribe

OE, Vol. 36, Issue 06, (June 1997) https://doi.org/10.1117/12.10.1117/1.601321

KEYWORDS: Sensors, Interferometers, Glasses, Ronchi rulings, Beam splitters, Gaussian beams, Optical engineering, Photodetectors, Spatial resolution, Mirrors

Proceedings Article | 25 March 1996 Paper

Improvement of the theoretical minimum detectable angle of the optical beam deflection method

Augusto Garcia-Valenzuela, J. Gardner, Massood Tabib-Azar

Proceedings Volume 2686, (1996) https://doi.org/10.1117/12.236133

KEYWORDS: Sensors, Mirrors, Beam splitters, Photodetectors, Signal detection, Reflection, Optical resolution, Electrodes, Diffraction, Sodium

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Proceedings Article | 21 October 1994 Paper

Comparative study of piezoelectric, piezoresistive, electrostatic, magnetic, and optical sensors

Augusto Garcia-Valenzuela, Massood Tabib-Azar

Proceedings Volume 2291, (1994) https://doi.org/10.1117/12.190901

KEYWORDS: Sensors, Electrodes, Silicon, Magnetism, Waveguides, Ferroelectric materials, Magnetic sensors, Oscillators, Thin films, Silicon films

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SPIE Journal Paper | 1 April 1994

Large-angle transmission and mode conversion characteristics of symmetric multimode Y-junction couplers

Augusto Garcia-Valenzuela, Murat Eskiyerly, Massood Tabib-Azar

OE, Vol. 33, Issue 04, (April 1994) https://doi.org/10.1117/12.10.1117/12.166932

KEYWORDS: Waveguides, Wave propagation, Waveguide modes, Single mode fibers, Ray tracing, Geometrical optics, Optical engineering, Integrated optics, Refractive index, Electrical engineering

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Proceedings Article | 2 March 1993 Paper

Smart integrated-optics displacement/force sensor based on speckle pattern detection using neural-net with 0.1-A resolution

Umesh Rao, Augusto Garcia-Valenzuela, Massood Tabib-Azar

Proceedings Volume 1793, (1993) https://doi.org/10.1117/12.141229

KEYWORDS: Sensors, Neural networks, Photodetectors, Waveguides, Speckle, Integrated optics, Speckle pattern, Actuators, Environmental sensing, Optical fibers

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Proceedings Article | 2 March 1993 Paper

Micromachined 50-um x 250-um silicon torsional mirror arrays for optical signal processing

Pin-Ju Hsiang, Augusto Garcia-Valenzuela, Mark Neifeld, Massood Tabib-Azar

Proceedings Volume 1793, (1993) https://doi.org/10.1117/12.141216

KEYWORDS: Mirrors, Silicon, Electrodes, Integrated optics, Optical signal processing, Spatial light modulators, Photodetectors, Optical arrays, Sensors, Modulators

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Proceedings Article | 2 March 1993 Paper

Fiber optic force and displacement sensor based on speckle detection with 0.1-nanonewton and 0.1-angstrom resolution

Augusto Garcia-Valenzuela, Massood Tabib-Azar

Proceedings Volume 1793, (1993) https://doi.org/10.1117/12.141221

KEYWORDS: Sensors, Photodetectors, Fiber optics sensors, Atomic force microscopy, Speckle pattern, Integrated optics, Speckle, Actuators, Fiber optics, Multimode fibers

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Proceedings Article | 2 March 1993 Paper

Mode conversion and large-angle transmission in symmetric multimode Y-junction couplers

Murat Eskiyerly, Augusto Garcia-Valenzuela, Massood Tabib-Azar

Proceedings Volume 1793, (1993) https://doi.org/10.1117/12.141231

KEYWORDS: Waveguides, Integrated optics, Wave propagation, Refractive index, Interfaces, Cladding, Waveguide modes, Geometrical optics, Single mode fibers, Silicon

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Showing 5 of 37 publications

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