Prof. Carlos Villa-Angulo Profile

Prof. Carlos Villa-Angulo

Research Engineer at Univ Autónoma de Baja California

SPIE Involvement:

Author

Publications (13)

SPIE Journal Paper | 31 May 2022

Photoinstability aversion in perovskite solar cell by downconversion cadmium chalcogenide filters

Carlos Tamayo-Bello, Ángel Sauceda-Carvajal, Rafael Villa-Angulo, Carlos Villa-Angulo

JPE, Vol. 12, Issue 02, 025501, (May 2022) https://doi.org/10.1117/12.10.1117/1.JPE.12.025501

KEYWORDS: Ultraviolet radiation, Cadmium sulfide, Perovskite, Cadmium, Solar cells, Optical filters, External quantum efficiency, Absorbance, Glasses, Chalcogenides

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SPIE Journal Paper | 27 October 2018

Correlation of theory with experimental photon absorption and photon emission of quasitype II CdS/ZnS QDs

Carlos Villa-Angulo, Francisco J. Guayante-Santacruz, Rafael Villa-Angulo, Iván O. Hernández-Fuentes, Ricardo Morales-Carbajal, José R. Villa-Angulo

JNP, Vol. 12, Issue 04, 046010, (October 2018) https://doi.org/10.1117/12.10.1117/1.JNP.12.046010

KEYWORDS: Absorption, Zinc, Spherical lenses, Cadmium sulfide, Electrons, Quantum dots, Absorbance, Nanophotonics, Semiconductors, Nanoparticles

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SPIE Journal Paper | 6 October 2016

Optical field dissipation in heterostructures for nanophotovoltaic devices

Carlos Villa-Angulo, Daniel Sauceda-Carvajal, José Villa-Angulo, Rafael Villa-Angulo

JNP, Vol. 10, Issue 04, 046001, (October 2016) https://doi.org/10.1117/12.10.1117/1.JNP.10.046001

KEYWORDS: Gallium, Heterojunctions, Absorption, Quantum wells, Active optics, Aluminum, Electrons, Binary data, Indium, Gallium arsenide

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SPIE Journal Paper | 9 October 2015

Optimization of organic photovoltaic device performance via exciton generation profile adjustment

Juan Carlos Quiroz-Sánchez, Víctor Cabrera-Arenas, Carlos Villa-Angulo

JPE, Vol. 5, Issue 01, 052098, (October 2015) https://doi.org/10.1117/12.10.1117/1.JPE.5.052098

KEYWORDS: Excitons, Active optics, Organic photovoltaics, Polymers, Solar energy, Metals, Interfaces, Photovoltaics, Electrodes, Oxides

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SPIE Journal Paper | 2 March 2015

Low-dimensional CdS/CdTe multiple-quantum well heterostructure for optical refrigeration

Julio Tarín-Cordero, Rafael Villa-Angulo, Jose Villa-Angulo, Carlos Villa-Angulo

JNP, Vol. 9, Issue 01, 093085, (March 2015) https://doi.org/10.1117/12.10.1117/1.JNP.9.093085

KEYWORDS: Quantum wells, Heterojunctions, Absorption, Luminescence, Semiconductors, Cadmium sulfide, Scattering, Optical cooling, Upconversion, Acoustics

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SPIE Journal Paper | 20 January 2014

Effect of effective mass mismatch in CdS/CdTe heterojunctions on the fundamental design parameters of nanophotonic devices

Jose Villa-Angulo, Rafael Villa-Angulo, Karina Solorio-Ferrales, Silvia Ahumada-Valdez, Carlos Villa-Angulo

JNP, Vol. 8, Issue 01, 083096, (January 2014) https://doi.org/10.1117/12.10.1117/1.JNP.8.083096

KEYWORDS: Quantum wells, Heterojunctions, Absorption, Nanophotonics, Cadmium sulfide, Error analysis, Semiconductors, Dielectrics, Scattering, Sensors

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SPIE Journal Paper | 10 January 2013

Photon absorption coefficient (α) for a low-dimensional CdS/CdTe absorber by a partial k-selection approach

Jose Villa-Angulo, Rafael Villa-Angulo, Carlos Villa-Angulo

JNP, Vol. 7, Issue 01, 073099, (January 2013) https://doi.org/10.1117/12.10.1117/1.JNP.7.073099

KEYWORDS: Absorption, Quantum wells, Quantum efficiency, Heterojunctions, Cadmium sulfide, Scattering, Diffusion, Semiconductors, Energy efficiency, Interfaces

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Proceedings Article | 29 April 2009 Paper

Tunable LYOT-filters

Eric Donkor, Patrick Kumavor, Carlos Villa

Proceedings Volume 7339, 73390B (2009) https://doi.org/10.1117/12.819457

KEYWORDS: Polarization, Polarizers, Optical filtering, Optical filters, Wave propagation interference, Imaging spectroscopy, Two wave mixing, Ranging, Telecommunications, Imaging systems

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Proceedings Article | 29 April 2009 Paper

A 1.28GSPS 12-bit optoelectronic analog-to-digital converter

Carlos Villa, Patrick Kumavor, Eric Donkor, Guanghai Jin

Proceedings Volume 7339, 73390G (2009) https://doi.org/10.1117/12.819454

KEYWORDS: Clocks, Optoelectronics, Electronic circuits, Multiplexers, Optical clocks, Computer programming, Analog electronics, Logic, Photodiodes, Quantization

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Proceedings Article | 27 March 2008 Paper

Optically-synchronized encoder and multiplexer scheme for interleaved photonics analog-to-digital conversion

Carlos Villa, Patrick Kumavor, Eric Donkor

Proceedings Volume 6975, 69750E (2008) https://doi.org/10.1117/12.781672

KEYWORDS: Computer programming, Multiplexing, Multiplexers, Digital electronics, Photonics, Photodiodes, Electronics, Analog electronics, Channel projecting optics, Optoelectronics

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Photonics Analog-to-Digital Converters (ADCs) utilize a train of optical pulses to sample an electrical input waveform applied to an electrooptic modulator or a reverse biased photodiode. In the former, the resulting train of amplitude-modulated optical pulses is detected (converter to electrical) and quantized using a conversional electronics ADC- as at present there are no practical, cost-effective optical quantizers available with performance that rival electronic quantizers. In the latter, the electrical samples are directly quantized by the electronics ADC. In both cases however, the sampling rate is limited by the speed with which the electronics ADC can quantize the electrical samples. One way to increase the sampling rate by a factor N is by using the time-interleaved technique which consists of a parallel array of N electrical ADC converters, which have the same sampling rate but different sampling phase. Each operating at a quantization rate of fs/N where fs is the aggregated sampling rate. In a system with no real-time operation, the N channels digital outputs are stored in memory, and then aggregated (multiplexed) to obtain the digital representation of the analog input waveform. Alternatively, for real-time operation systems the reduction of storing time in the multiplexing process is desired to improve the time response of the ADC. The complete elimination of memories come expenses of concurrent timing and synchronization in the aggregation of the digital signal that became critical for a good digital representation of the analog signal waveform. In this paper we propose and demonstrate a novel optically synchronized encoder and multiplexer scheme for interleaved photonics ADCs that utilize the N optical signals used to sample different phases of an analog input signal to synchronize the multiplexing of the resulting N digital output channels in a single digital output port. As a proof of concept, four 320 Megasamples/sec 12-bit of resolution digital signals were multiplexed to form an aggregated 1.28 Gigasamples/sec single digital output signal.

Proceedings Article | 24 March 2008 Paper

High speed optoelectronics polyphase scheme for sampling and demultiplexing RF analog signals

Carlos Villa, Patrick Kumavor, Aaron Feldstein, Jennifer Hernandez, Eric Donkor

Proceedings Volume 6975, 69750G (2008) https://doi.org/10.1117/12.781449

KEYWORDS: Optoelectronics, Analog electronics, Clocks, Photodiodes, Optical clocks, Signal processing, Electronics, Signal generators, Data conversion, Optical networks

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Proceedings Article | 7 May 2007 Paper

40 GSPS opto-electronic polyphase analog-to-digital converter

Carlos Villa, Eric Donkor, Michael Hayduk, Rebecca Bussjager

Proceedings Volume 6572, 657207 (2007) https://doi.org/10.1117/12.721366

KEYWORDS: Optoelectronics, Optical clocks, Clocks, Quantization, Optical networks, Electronic circuits, Analog electronics, Signal processing, Photodiodes, Integrated optics

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Proceedings Article | 19 May 2006 Paper

Demonstration of a 5.12 GHz optoelectronics sampling circuit for analog-to-digital converters

Carlos Villa, Patrick Kumavor, Bruce Burgess, Eric Donkor

Proceedings Volume 6236, 623607 (2006) https://doi.org/10.1117/12.668902

KEYWORDS: Optical clocks, Photodiodes, Optoelectronics, Clocks, Optical circuits, Signal processing, Channel projecting optics, Switches, Multiplexing, Resistors

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Showing 5 of 13 publications

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