Personal information

Websites & social links

Web de la Universidad

Other IDs

Scopus Author ID: 7402797397
Scopus Author ID: 57226221435

Keywords

Characterization of liquid crystals devices, Instrumentation for Rehabilitacion, Visible light communication (VLC), Visual Light Positioning (VLP)

Countries

Spain

Biography

Juan Carlos Torres Zafra obtained his MS degree in Industrial Engineering from the Polytechnic University of Valencia, Spain, in 2001, and later earned his PhD in Electrical, Electronic, and Automatic Engineering from Carlos III University of Madrid in 2009. Upon joining the Displays and Photonics Applications (GDAF) group at the University Carlos III of Madrid, his research focused primarily on liquid crystal technology.

He conducted studies to determine equivalent electrical circuit parameters in Antiferroelectric Liquid Crystal (AFLC) and V-SHAPE devices. Exploring non-photonic applications in liquid crystal devices, he proposed innovative electrical circuits, leveraging the variation of liquid crystal capacitance in response to the applied voltage. His research extended to nanoparticle-doped liquid crystals, altering their electrical properties for the design of new sensors.

Furthermore, he actively contributed to GDAF's initiative for designing technical aids for individuals with disabilities, particularly those with visual impairment, by researching and implementing stereoscopic image processing algorithms in see-through glasses.

Currently, he leads the Visible Light Communications (VLC) project, focusing on electro-optical characterization, LED bandwidth improvement, and designing new drivers for a high-power visible light transmission method.

Activities

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Employment (4)

Universidad Carlos III de Madrid - Campus de Leganés: Leganes, Comunidad de Madrid, ES

2013-09-06 to present | Profesor Visitante (Tecnología Electrónica)
Employment
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Universidad Carlos III de Madrid - Campus de Leganés: Leganes, Comunidad de Madrid, ES

2010-09-06 to 2013-09-05 | Profesor Ayudante Doctor (Tecnología Electrónica)
Employment
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Universidad Carlos III de Madrid - Campus de Leganés: Leganes, Comunidad de Madrid, ES

2009-10-21 to 2010-09-05 | Profesor Ayudante Específico (Tecnología Electrónica)
Employment
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Universidad Carlos III de Madrid - Campus de Leganés: Leganes, Comunidad de Madrid, ES

2004-10-21 to 2009-10-20 | Profesor Ayudante (Tecnología Electrónica)
Employment
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Works (42)

Exploring Bandwidth Capabilities of Solar Cells for VLC Applications

IEEE Transactions on Industrial Informatics
2025-01 | Journal article
DOI: 10.1109/TII.2024.3468449
Contributors: Carlos Iván del Valle Morales; Juan Carlos Torres Zafra; Máximo Morales Céspedes; Iñaki Martinez-Sarriegui; José Manuel Sánchez-Pena
Source: check_circle
Crossref

Navigating in Light: Precise Indoor Positioning Using Trilateration and Angular Diversity in a Semi-Spherical Photodiode Array with Visible Light Communication

Electronics
2024-09-10 | Journal article
DOI: 10.3390/electronics13183597
Contributors: Javier Barco Alvárez; Juan Carlos Torres Zafra; Juan Sebastián Betancourt; Máximo Morales Cespedes; Carlos Iván del Valle Morales
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Optoelectronics Interfaces for a VLC System for UHD Audio-Visual Content Transmission in a Passenger Van: HW Design

Sensors
2024-09-08 | Journal article
DOI: 10.3390/s24175829
Contributors: Carlos Iván del Valle Morales; Juan Sebastián Betancourt Perlaza; Juan Carlos Torres Zafra; Iñaki Martinez-Sarriegui; José Manuel Sánchez-Pena
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Characterization of a Perovskites Photovoltaic-based Optical Receiver

2023 South American Conference On Visible Light Communications (SACVLC)
2023-11-08 | Conference paper
DOI: 10.1109/sacvlc59022.2023.10347709
Contributors: Carlos Iván Del Valle Morales; Othman Isam Younus; Yongtao Qu; Zabih Ghassemlooy; JUAN CARLOS TORRES ZAFRA; Iñaki Martinez-Sarriegui; José Manuel Sánchez- Pena
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Measurement of the Modulation Bandwidth of High-Power Chip-on-Board LEDs for VLC systems

2022 13th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2022
2022 | Conference paper
DOI: 10.1109/CSNDSP54353.2022.9908014
EID:

2-s2.0-85140459253
Contributors: Perlaza, J.S.B.; Zafra, J.C.T.; Morales-Céspedes, M.; Qidan, A.A.; Bentura, B.; Armada, A.G.; Pena, J.M.S.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

An Enhanced Method for Dynamic Characterization of High-Power LEDs for Visible Light Communication Applications

Electronics
2022-01-18 | Journal article
DOI: 10.3390/electronics11030292
Part of ISSN: 2079-9292
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA
grade
Preferred source (of 5)‎

Characterization of high-power white leds for VLC applications

Measurement: Sensors
2021-12 | Journal article
DOI: 10.1016/j.measen.2021.100215
Part of ISSN: 2665-9174
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Design and Experimental Implementation of a Multi-Cloak Paraxial Optical System

Photonics
2021-08-28 | Journal article
DOI: 10.3390/photonics8090358
Part of ISSN: 2304-6732
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Electrical Behavior of Liquid Crystal Devices with Dielectric Nanoparticles

Journal of Nanomaterials
2020 | Journal article
DOI: 10.1155/2020/4515432
EID:

2-s2.0-85079354810
Contributors: Marzal, V.; Caño-García, M.; Torres, J.C.; Quintana, X.; Pérez, I.; Garcia-Camara, B.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

A Low-Cost Visible Light Positioning System for Indoor Positioning

Sensors
2020-09-09 | Journal article
DOI: 10.3390/s20185145
Part of ISSN: 1424-8220
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA

Development and evaluation of a head-mounted display system based on stereoscopic images and depth algorithms for patients with visual impairment

Displays
2019 | Journal article
DOI: 10.1016/j.displa.2019.01.002
EID:

2-s2.0-85061047011
Contributors: Coco-Martin, M.B.; Pichel-Mouzo, M.; Torres, J.C.; Vergaz, R.; Cuadrado, R.; Pinto-Fraga, J.; Coco, R.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

An all-organic flexible visible light communication system

Sensors (Switzerland)
2018 | Journal article
DOI: 10.3390/s18093045
EID:

2-s2.0-85053708013
Contributors: Vega-Colado, C.; Arredondo, B.; Torres, J.C.; López-Fraguas, E.; Vergaz, R.; Martín-Martín, D.; Del Pozo, G.; Romero, B.; Apilo, P.; Quintana, X. et al.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Wireless temperature sensor based on a nematic liquid crystal cell as variable capacitance

Sensors (Switzerland)
2018 | Journal article
DOI: 10.3390/s18103436
EID:

2-s2.0-85054894595
Contributors: Torres, J.C.; García-Cámara, B.; Pérez, I.; Urruchi, V.; Sánchez-Pena, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

All-electrical liquid crystal sensors

Liquid Crystal Sensors
2017 | Book chapter
Part of DOI: 10.1201/9781315120539
EID:

2-s2.0-85052467332
Contributors: Zafra, J.C.T.; Garcéa-Cámara, B.; Marcos, C.; Garcilópez, I.P.; Urruchi, V.; Sánchez-Pena, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Study of electrical behavior of liquid crystal devices doped with titanium dioxide nanoparticles

Photonics Letters of Poland
2017 | Journal article
DOI: 10.4302/plp.v9i1.712
EID:

2-s2.0-85016818840
Contributors: Marzal, V.; Torres, J.C.; García-Cámara, B.; Pérez, I.; Sánchez-Pena, J.M.; Piecek, W.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Dual-wavelength speckle-based SI-POF sensor for frequency detection and localization of remote vibrations

Proceedings of SPIE - The International Society for Optical Engineering
2016 | Conference paper
DOI: 10.1117/12.2236832
EID:

2-s2.0-84976571229
Contributors: Pinzón, P.J.; Montero, D.S.; Tapetado, A.; Torres, J.C.; Vázquez, C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Induced Magnetic Anisotropy in Liquid Crystals Doped with Resonant Semiconductor Nanoparticles

Journal of Nanomaterials
2016 | Journal article
DOI: 10.1155/2016/7659074
EID:

2-s2.0-84982099188
Contributors: Marzal, V.; Torres, J.C.; Pérez, I.; Sánchez-Pena, J.M.; García-Cámara, B.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Temperature-phase converter based on a LC cell as a variable capacitance

Sensors (Switzerland)
2015 | Journal article
DOI: 10.3390/s150305594
EID:

2-s2.0-84928660633
Contributors: Torres, J.C.; García-Cámara, B.; Pérez, I.; Urruchi, V.; Sánchez-Pena, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Effects of elongation on polymer optical fiber power losses for sensing purposes

Proceedings of SPIE - The International Society for Optical Engineering
2014 | Conference paper
DOI: 10.1117/12.2059276
EID:

2-s2.0-84903218513
Contributors: Montero, D.S.; Torres, J.C.; Zahr-Viñuelas, J.; Pérez Castellanos, J.L.; Vázquez, C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Frequency and temperature dependence of fabrication parameters in polymer dispersed liquid crystal devices

Materials
2014 | Journal article
DOI: 10.3390/ma7053512
EID:

2-s2.0-84902590060
Contributors: Torres, J.C.; Vergaz, R.; Barrios, D.; Sánchez-Pena, J.M.; Viñuales, A.; Grande, H.J.; Cabañero, G.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Modeling of unwrapped phase defects in modal liquid crystal cylindrical microlenses

IEEE Photonics Technology Letters
2014 | Journal article
DOI: 10.1109/LPT.2013.2291863
EID:

2-s2.0-84892598443

Part of ISSN: 10411135
Contributors: Del Pozo, V.U.; Genaro, J.F.A.; Zafra, J.C.T.; Sanchez-Pena, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

New electro-optic and display technology for visually disabled people

Handbook of Research on ICTs for Human-Centered Healthcare and Social Care Services
2013 | Book chapter
Part of DOI: 10.4018/978-1-4666-3986-7.ch036
EID:

2-s2.0-84898199282
Contributors: Benito, R.V.; Torres-Zafra, J.C.; Vega-Colado, C.; Sánchez-Pena, J.M.; Coco, M.B.; Coco, R.; Cuadrado, R.; López-Miguel, A.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Study of the photo-thermo-mechanical behavior of pmma-core POFS

Proceedings of 22nd International Conference on Plastical Optical Fibers, POF 2013
2013 | Conference paper
EID:

2-s2.0-84890646082
Contributors: Montero, D.S.; Torres, J.C.; Pérez-Castellanos, J.L.; Zahr-Viñuela, J.; Vázquez, C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Note: Series and parallel tunable resonators based on a nematic liquid crystal cell as variable capacitance

Review of Scientific Instruments
2012 | Journal article
DOI: 10.1063/1.4738645
EID:

2-s2.0-84865714990
Contributors: Torres, J.C.; Marcos, C.; Sánchez-Pena, J.M.; Pérez, I.; Urruchi, V.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Temperature-frequency converter using a liquid crystal cell as a sensing element

Sensors
2012 | Journal article
DOI: 10.3390/s120303204
EID:

2-s2.0-84858965322
Contributors: Marcos, C.; Sánchez Pena, J.M.; Torres, J.C.; Santos, J.I.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Thickness-dependent coloration properties of glass-substrate viologen-based electrochromic devices

IEEE Photonics Journal
2012 | Journal article
DOI: 10.1109/JPHOT.2012.2227249
EID:

2-s2.0-84870269950
Contributors: Barrios, D.; Vergaz, R.; Torres-Zafra, J.C.; Vega, C.; Sanchez-Pena, J.M.; Vinuales, A.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Dependence on the parameters of the equivalent electrical circuit model with the thickness of viologen-based electrochromic mixture on glass substrate devices

Materials Research Society Symposium Proceedings
2011 | Conference paper
DOI: 10.1557/opl.2011.1305
EID:

2-s2.0-84860585676
Contributors: Barrios, D.; Vergaz, R.; Torres, J.C.; Sańchez-Pena, J.-M.; Viñuales, A.; Salsamendi, M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Electrical modeling of tristate antiferroelectric liquid crystal devices

Optical Engineering
2011 | Journal article
DOI: 10.1117/1.3564817
EID:

2-s2.0-79959437644
Contributors: Torres Zafra, J.C.; Garcilópez, I.P.; Del Pozo, V.U.; Sánchez Pena, J.M.; Lucas, C.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Note: Phase-locked loop with a voltage controlled oscillator based on a liquid crystal cell as variable capacitance

Review of Scientific Instruments
2011 | Journal article
DOI: 10.1063/1.3666865
EID:

2-s2.0-84855317131
Contributors: Marcos, C.; Sánchez-Pena, J.M.; Torres, J.C.; Pérez, I.; Urruchi, V.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Wind tunnel air velocity sensor using plastic optical fiber as detector of vortex shedding

POF 2011: 20th International Conference on Plastic Optical Fibers - Conference Proceeding
2011 | Conference paper
EID:

2-s2.0-84879376167
Contributors: Marcos, C.; Torres, J.C.; D. Barrios; Sánchez-Pena, J.M.; Montero, D.S.; Lallana, P.C.; Vázquez, C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Temporal electrical response of chiral smectic liquid crystal displays with V/W-shaped electrooptical characteristic

Opto-electronics Review
2008 | Journal article
DOI: 10.2478/s11772-007-0032-6
EID:

2-s2.0-43249087865
Contributors: Pena, J.M.S.; Pérez, I.; Urruchi, V.; Torres, J.C.; Otón, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Electrooptical behaviour and control of a suspended particle device

Opto-electronics Review
2007 | Journal article
DOI: 10.2478/s11772-007-0013-9
EID:

2-s2.0-34547322196
Contributors: Vergaz, R.; Pena, J.M.S.; Barrios, D.; Pérez, I.; Torres, J.C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Enhanced instrumentation system to characterize the electric behavior of AFLC displays

Proceedings of SPIE - The International Society for Optical Engineering
2007 | Conference paper
DOI: 10.1117/12.722099
EID:

2-s2.0-36248994635
Contributors: Pena, J.M.S.; Santos, J.I.; Torres, J.C.; Gaona, N.; Vázquez, C.; Quesada, D.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Optoelectronic multiplexer for digital data processing based on lipid crystal pixels and optical fiber elements

Opto-electronics Review
2007 | Journal article
DOI: 10.2478/s11772-007-0003-y
EID:

2-s2.0-34250782057
Contributors: Pérez, I.; Pena, J.M.S.; Torres, J.C.; Manzanares, R.; Marcos, C.; Vázquez, C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Sinusoidal voltage-controlled oscillator based on a liquid crystal cell as variable capacitance

Japanese Journal of Applied Physics, Part 2: Letters
2007 | Journal article
DOI: 10.1143/JJAP.46.L221
EID:

2-s2.0-34547915948
Contributors: Pérez, I.; Sánchez-Pena, J.M.; Torres, J.C.; Manzanares, R.; Otón, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Temperature dependence of liquid crystals electrical response by impedance analysis

Proceedings of SPIE - The International Society for Optical Engineering
2007 | Conference paper
DOI: 10.1117/12.722024
EID:

2-s2.0-36248997625
Contributors: Torres, J.C.; Gaona, N.; Pérez, I.; Urruchi, V.; Pena, J.M.S.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Tunable feedback resonator based on a nematic liquid crystal cell as variable capacitance

Proceedings of SPIE - The International Society for Optical Engineering
2007 | Conference paper
DOI: 10.1117/12.734435
EID:

2-s2.0-42149140775
Contributors: Marcos, C.; Torres, J.C.; Pena, J.M.S.; Pérez, I.; Vázquez, C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Electrical response of antiferroelectric liquid crystal cells with asymmetric response

Molecular Crystals and Liquid Crystals
2006 | Journal article
DOI: 10.1080/15421400600586334
EID:

2-s2.0-33645718029
Contributors: Urruchi, V.; Pérez, I.; Pena, J.M.S.; Torres, J.C.; Castillo, P.L.; Quintana, X.; Otón, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Liquid crystal materials with asymmetric switching for microdisplay applications

Proceedings of SPIE - The International Society for Optical Engineering
2005 | Conference paper
DOI: 10.1117/12.608384
EID:

2-s2.0-28344433659
Contributors: Urruchi, V.; Pérez, I.; Pena, J.M.S.; Torres, J.C.; Manzanares, R.; Quintana, X.; Otón, J.M.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Row and column drivers for addressing full color and video rate antiferroelectric liquid crystal microdisplays

Proceedings of SPIE - The International Society for Optical Engineering
2005 | Conference paper
DOI: 10.1117/12.608579
EID:

2-s2.0-28344452117
Contributors: Sanchez-Pena, J.M.; Santos, J.I.; Manzanares, R.; Pérez, I.; Urruchi, V.; Torres, J.C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Hardware architectures for mobile robots

IFAC Proceedings Volumes (IFAC-PapersOnline)
2003 | Conference paper
DOI: 10.1016/S1474-6670(17)33423-7
EID:

2-s2.0-85064435268
Contributors: Armesto, L.; Torres, J.C.; Tornero, J.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier

Transport process automation with industrial forklifts

IFAC Proceedings Volumes (IFAC-PapersOnline)
2003 | Conference paper
DOI: 10.1016/S1474-6670(17)33453-5
EID:

2-s2.0-85060402865
Contributors: Annesto, L.; Tornero, J.; Torres, J.C.
Source: Self-asserted source
JUAN CARLOS TORRES ZAFRA via Scopus - Elsevier
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