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Joaquín García-García

Bio: Joaquín García-García is an academic researcher from Benemérita Universidad Autónoma de Puebla. The author has contributed to research in topics: Optical vortex & Vortex. The author has an hindex of 3, co-authored 6 publications receiving 131 citations.

Papers
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Journal ArticleDOI
TL;DR: An improved technique for generating the perfect optical vortex is proposed and is notable for the simplicity of its practical realization and high quality of the results.
Abstract: We propose an improved technique for generating the perfect optical vortex. This technique is notable for the simplicity of its practical realization and high quality of the results. The efficiency of the proposed technique is illustrated with the results of physical experiments and an example of its application in optical trapping of small particles.

126 citations

Journal ArticleDOI
TL;DR: A new family of partially coherent beams carrying optical vortices is introduced that represents an incoherent superposition of fully coherent orthogonal Bessel modes with the same helical wavefront and is notable for its diffraction-free propagation.
Abstract: A new family of partially coherent beams carrying optical vortices is introduced. Any member of this family represents an incoherent superposition of fully coherent orthogonal Bessel modes with the same helical wavefront and is notable for its diffraction-free propagation. It is shown analytically and experimentally that such beams can be approximately generated in the Fourier-transforming optical system with a computer-controlled liquid-crystal spatial light modulator.

25 citations

Journal ArticleDOI
TL;DR: In this paper, the authors extend the concept of perfect optical vortex to the vector case and investigate its focusing properties in the high numerical aperture regime, showing that simultaneous phase encoding of orthogonal components can be realized by means of a 4 f imaging system incorporating a phase only liquid-crystal spatial light modulator whose director axis is rotated 45° with respect to the horizontal axis.

5 citations

Proceedings ArticleDOI
16 Nov 2014
TL;DR: In this article, an improved technique for generating the perfect optical vortex is proposed, notable for the simplicity of its practical realization and the high quality of the results that is applied to an optical trapping experiment.
Abstract: We propose an improved technique for generating the perfect optical vortex, notable for the simplicity of its practical realization and the high quality of the results that is applied to an optical trapping experiment.

4 citations

Proceedings ArticleDOI
TL;DR: In this article, a novel technique for vortex generation using the liquid crystal spatial light modulator is proposed, where the vortex radius is chosen independently of the topological charge, and experimental results using LC2002 modulator are shown.
Abstract: A novel technique for vortex generation using the liquid crystal spatial light modulator is proposed. Unlike other methods, the vortex radius is chosen independently of the topological charge. Experimental results using LC2002 modulator are shown.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: The prefect vortex beam generation method can be used to excite OAM modes in an annular core fiber and the theoretical predictions match with the experimental results and also provide an explanation for previous published works.
Abstract: We derive a mathematical description of a perfect vortex beam as the Fourier transformation of a Bessel beam. Building on this development, we experimentally generate Bessel–Gauss beams of different orders and Fourier transform them to form perfect vortex beams. By controlling the radial wave vector of a Bessel–Gauss beam, we can control the ring radius of the generated beam. Our theoretical predictions match with the experimental results and also provide an explanation for previous published works. We find the perfect vortex resembles that of an orbital angular momentum (OAM) mode supported in annular profiled waveguides. Our prefect vortex beam generation method can be used to excite OAM modes in an annular core fiber.

339 citations

Journal ArticleDOI
TL;DR: This review presents a comprehensive overview of the theoretical aspects of chirality in light, nanostructures, and nanosystems and their chiroptical interactions and describes the strong intrinsic and extrinsic chiral properties in plasmonic nanoparticle systems.
Abstract: Chirality arises universally across many different fields. Recent advancements in artificial nanomaterials have demonstrated chiroptical responses that far exceed those found in natural materials. Chiroptical phenomena are complicated processes that involve transitions between states with opposite parities, and solid interpretations of these observations are yet to be clearly provided. In this review, we present a comprehensive overview of the theoretical aspects of chirality in light, nanostructures, and nanosystems and their chiroptical interactions. Descriptions of observed chiroptical phenomena based on these fundamentals are intensively discussed. We start with the strong intrinsic and extrinsic chirality in plasmonic nanoparticle systems, followed by enantioselective sensing and optical manipulation, and then conclude with orbital angular momentum-dependent responses. This review will be helpful for understanding the mechanisms behind chiroptical phenomena based on underlying chiral properties and useful for interpreting chiroptical systems for further studies. Strengthening the theoretical understanding of chirality is necessary for developing applications based on its phenomena. Junsuk Rho of Korea’s Pohang University of Science and Technology (POSTECH) reviewed with colleagues the theoretical aspects of chirality, a symmetry property that describes mirror-image objects or systems that cannot be superimposed. Chiral materials have attracted much attention due to their interesting interactions. Scientists are familiar with how geometrically chiral objects and systems interact with light. However, such ‘chiroptical effects’ can also be found in achiral systems, Rho and his colleagues explain. Also, globally achiral light can be locally chiral near nanostructures. Scientists need to extend their concepts and theoretical understandings of chiroptical systems in order to be able to further develop applications based on their phenomena, such as in metamaterials, sensing, spintronics and stereochemistry.

292 citations

Journal ArticleDOI
TL;DR: In this article, a vector vortex beam can be decomposed into a vector beam and a vortex, whereby the generation can be realized by sequentially using a q-plate and a spiral phase plate.
Abstract: We propose theoretically and verify experimentally a method of combining a q-plate and a spiral phase plate to generate arbitrary vector vortex beams on a hybrid-order Poincare sphere. We demonstrate that a vector vortex beam can be decomposed into a vector beam and a vortex, whereby the generation can be realized by sequentially using a q-plate and a spiral phase plate. The generated vector beam, vortex, and vector vortex beam are verified and show good agreement with the prediction. Another advantage that should be pointed out is that the spiral phase plate and q-plate are both fabricated on silica substrates, suggesting the potential possibility to integrate the two structures on a single plate. Based on a compact method of transmissive-type transformation, our scheme may have potential applications in future integrated optical devices.

161 citations

Journal ArticleDOI
TL;DR: This work approximately generates perfect VVBs with locally linear and elliptical polarizations, and demonstrates that such beams can keep their intensity profile and SoP at a certain propagation distance.
Abstract: We propose the concept of perfect vectorial vortex beams (VVBs), which not merely have intensity profile independent of the polarization order and the topological charge of spiral phase, but also have stable intensity profile and state of polarization (SoP) upon propagation. Utilizing a Sagnac interferometer, we approximately generate perfect VVBs with locally linear and elliptical polarizations, and demonstrate that such beams can keep their intensity profile and SoP at a certain propagation distance. These proposed VVBs can be expanded to encode information and quantum cryptography, as well as to enrich the conversion of spin and orbital angular momenta.

141 citations

Journal ArticleDOI
TL;DR: The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength; with this confinement, the plasmic field facilitates trapping of various nanostructures and materials with higher precision as mentioned in this paper.
Abstract: Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects. More recently, the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods. The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength; with this confinement, the plasmonic field facilitates trapping of various nanostructures and materials with higher precision. The successful manipulation of small particles has fostered numerous and expanding applications. In this paper, we review the principles of and developments in plasmonic tweezers techniques, including both nanostructure-assisted platforms and structureless systems. Construction methods and evaluation criteria of the techniques are presented, aiming to provide a guide for the design and optimization of the systems. The most common novel applications of plasmonic tweezers, namely, sorting and transport, sensing and imaging, and especially those in a biological context, are critically discussed. Finally, we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.

116 citations