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New paper in Applied Sciences about the generation of hybrid vector beams with a detuned q-plate


ASOur new paper is available in Applied Sciences, entitled Analysis of hybrid vector beams generated with a detuned q-plate. This article belongs to the journal special issue devoted to Ultrafast Vortex Pulses.

We use a tunable commercial liquid-crystal q-plate tuned to a quarter-wave retardance to study the generation and dynamics of different types of hybrid vector beams. Standard hybrid vector beams but also petal-like hybrid vector beams are generated. These beams are analyzed in the near field and compared with the far field distribution, where their hybrid nature is observed as a transformation of the intensity and polarization patterns.

The work has been developed during the stay in Elche last year of Julio César Quiceno, from Universidad del Valle, in Cali, Colombia.


Viernes, 15 de mayo de 2020 Sin comentarios

New paper in OSA Continuum showing Bessel beams with tunable control through maximum phase modulation


getThumbnail.cfmOur new publication is available in OSA Continuum Dynamic control of Bessel beams through high-phase diffractive axicon.

We present the realization of a high-phase diffractive axicon using a an SLM that exhibits 10π phase modulation. We compare the results with standard diffractive axicons with only 2π phase modulation. We show that high-phase modulation axicons generate Bessel beams with a shorter range and a smaller radius than standard axicons with the same period. We also find that the higher phase modulation regime provides improved diffraction efficiency since fringing effects are reduced. Dynamic control of Bessel beams is presented, controlled through the phase modulation dynamic range.

The paper has been done in collaboration with our friends at San Diego State University.


Categories: International, Projects, Research Tags:

Martes, 12 de mayo de 2020 Sin comentarios

Revista Española de Física highlights our technique to generate vector beams


REVRevista Española de Física, the journal of the Real Sociedad Española de Física – RSEF, highlights our technique presented in our recent paper in Optics and Lasers in Engineering.

A summary has been included in the section ‘Puntos de Interés» (link).

We thank Prof. Augusto Beléndez, Editor of REF for selecting our research for this section.


Sábado, 28 de marzo de 2020 Sin comentarios

TecnOPTO organizes a workshop on ‘Structured Light, Polarimetry and Imaging’


Workshop

On November 25th, 2019 we organized a workshop entitled ‘Structured Light, Polarimetry and Imaging‘.

The workshop was held at the Institute of Bioengineering of UMH, and we could count with the participation of experts from different groups in Spain working in these related fields. The program can be viewed at the following link.

We thank all the participants and attendees to this extremely interesting and motivating reunion.


Martes, 26 de noviembre de 2019 Sin comentarios

New paper in OLEN analyzing the diffraction efficiency of stepped gratings in large phase modulation SLMs


OLENOur new publication is available in Optics & Lasers in Engineering, entitled Diffraction efficiency of stepped gratings using high phase-modulation spatial light modulators.

We study the diffraction efficiency of linear phase (blazed) diffraction gratings displayed onto SLMs that exhibit a large phase modulation range, reaching a maximum phase modulation of 8pi or 10pi radians. We analyse these effects for their important implications in the Nyquist limit for diffractive elements

The paper has been done in collaboration with our friends at San Diego State University.


Domingo, 3 de noviembre de 2019 Sin comentarios

Visit of Dr. Tomás Belenguer from INTA


We had the pleasure to receive the visit of Dr. Tomás Belenguer Dávila, head of the Space Optical Instrumentation of INTA – Instituto Nacional de Técnica Aeroespacial.

The visit of Dr. Belenguer was part of hisp articipation in the TECNIT PhD Program Workshop, where he delivered a presentation about his activities, entitled Optical instrumentation in space missions. The presentation can be viewed at the following link:


Categories: Education, Outreach, Research Tags:

Martes, 15 de octubre de 2019 Sin comentarios

New paper in OLEN with a technique to generate vector beams


OLENA new publication of our team is available at the journal Optics & Lasers in Engineering, entitled Efficient on-axis engineering of optical vector modes.

In this work we present a method for the efficient experimental generation of arbitrary polarized vector beam modes. The optical system employs two LCOS-SLMs in a common path architecture, avoiding the use of beam-splitters.

We apply a recently proposed random technique to encode complex amplitude values. This encoding technique reconstructs the complex function on-axis, thus avoiding incorporating carrier phases. We demonstrate arbitrary scalar modes encoded onto orthogonal polarization components, whose superposition results in a vector beam mode.


Categories: Publications, Research Tags:

Sábado, 28 de septiembre de 2019 Sin comentarios

Special Section in Optical Engineering about Spatial Light Modulators


A special section on Spatial Light Modulators (SLMs) – Devices and Applications will be published in the journal Optical Engineering. Ignacio Moreno and María Del Mar Sanchez-Lopez are Guest Editors of this special section of the journal, together with Prof. Andrew Forbes and Prof. Yoshio Hayasaky.

The following link leads to the journal Call for Papers.

The deadline for submitting papers is October 15th, 2019. See here the flyer of the OE special section on SLMs. OE-SLMs

 


Miércoles, 14 de agosto de 2019 Sin comentarios

Maria del Mar Sanchez-Lopez visits GROC-UJI


María del Mar Sánchez-López visited the Group of Optics of the University Jaume I de Castellón (GROC-UJI) to participate as a member of the jury of the Doctoral Thesis of Yessenia Jauregui Sanchez, supervised by Prof. Jesús Lancis and Prof. Enrique Tajahuerce.

Excellent work on single-pixel cameras and imaging through scattering media!

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Categories: Research, Thesis Tags:

Sábado, 20 de julio de 2019 Sin comentarios

Pascuala García, María del Mar Sánchez and David Marco attend the Bienal de Física by RSEF


BienalPascuala García, María del Mar Sánchez, and David Marco attended the Bienal de Física, the biannual Spanish meeting of Physics, organized in Zaragoza by the Spanish Royal Physics Society(RSEF) (link)

David presented the poster entitled «Parallel generation of vortex beams with a 2D optical triplicator geometric phase design» in the Symposium of Quantum Optics (see here the related publication). And Pascuala presented the flash talk entitled «Highly efficient generation of arbitrary vector beams» in the Symposium of Applied Photonics (see here the related publication).

Pascuala also organized and chaired the session of Women in Physics, where María del Mar gave a talk on the activity promoting women in STEM entitled «Jornadas La Ciencia tiene nombre de Mujer de la Universidad Miguel Hernández».

 

 


Sábado, 20 de julio de 2019 Sin comentarios