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Browsing by Author "Fenollosa Esteve, Roberto"

Now showing items 1-20 of 20

A new dielectric metamaterial building block with a strong magnetic response in the sub-1.5-micrometer region: Silicon colloid nanocavities

Shi, Lei; Tuzer, Turan Umut; Fenollosa Esteve, Roberto; Meseguer Rico, Francisco Javier (Wiley, 2012-11-20)

A new dielectric metamaterial building block based on high refractive index silicon spherical nanocavities with Mie resonances appearing in the near infrared optical region is prepared and characterized. It is demonstrated ...
All silicon waveguide spherical microcavity coupler device

Xifre Perez, Elisabet; Doménech Gómez, José David; Fenollosa Esteve, Roberto; Muñoz Muñoz, Pascual; Capmany Francoy, José; Meseguer Rico, Francisco Javier (Optical Society of America, 2011)

A coupler based on silicon spherical microcavities coupled to silicon waveguides for telecom wavelengths is presented. The light scattered by the microcavity is detected and analyzed as a function of the wavelength. The ...
All-Silicon spherical-Mie-resonator photodiode with spectral response in the infrared region

Garín Escrivá, Moisés; Fenollosa Esteve, Roberto; Alcubilla, Ramón; Shi, Lei; Marsal, L. F.; Meseguer Rico, Francisco Javier (Nature Publishing Group, 2014-03)

[EN] Silicon is the material of choice for visible light photodetection and solar cell fabrication. However, due to the intrinsic band gap properties of silicon, most infrared photons are energetically useless. Here, we ...
Angle-Dependent Quality Factor of Mie Resonances in Silicon-Colloid-Based Microcavities

Shi, Lei; Fenollosa Esteve, Roberto; TUZER, TURAN UMUT; MESEGUER RICO, FRANCISCO JAVIER (American Chemical Society, 2014)

[EN] Semiconductor photonic microcavities are currently very important elements in the field of photonics. We here report the light-trapping ability of 3D silicon spherical micrometer-sized photonic cavities, which are ...
Groove-assisted solution growth of lead bromide perovskite aligned nanowires: a simple method towards photoluminescent materials with guiding light properties

Rodriguez, Isabelle; Fenollosa Esteve, Roberto; RAMIRO MANZANO, FERNANDO; García-Aboal, Rocío; Atienzar Corvillo, Pedro Enrique; MESEGUER RICO, FRANCISCO JAVIER (Royal Society of Chemistry, 2019-09-01)

[EN] High refractive index nanowires are very attractive because of their waveguiding properties and their multiple applications. In this sense, metal halide perovskites, an emerging and appealing optoelectronic material, ...
In situ size sorting in CVD synthesis of Si microspheres

Garín Escrivá, Moisés; Fenollosa Esteve, Roberto; Kowalski, L. (Nature Publishing Group, 2016-11-08)

[EN] Silicon microspheres produced in gas-phase by hot-wall CVD offer unique quality in terms of sphericity, surface smoothness, and size. However, the spheres produced are polydisperse in size, which typically range from ...
Low order modes in microcavities based on silicon colloids

Xifre Perez, Elisabet; Fenollosa Esteve, Roberto; Meseguer Rico, Francisco Javier (Optical Society of America, 2011-02-14)

[EN] Silicon colloids based microcavities, with sphere size between 1 and 3 micrometers, have been synthesized and optically characterized. Due to both the small cavity volume and the high refractive index of silicon we ...
Magnetic light and forbidden photochemistry: the case of singlet oxygen

Manjavacas, Alejandro; Fenollosa Esteve, Roberto; Rodriguez, Isabelle; Jiménez Molero, María Consuelo; Miranda Alonso, Miguel Ángel; Meseguer Rico, Francisco Javier (The Royal Society of Chemistry, 2017)

[EN] Most optical processes occurring in nature are based on the well-known selection rules for opticaltransitions between electronic levels of atoms, molecules, and solids. Since in most situations themagnetic component ...
Medically Biodegradable Hydrogenated Amorphous Silicon Microspheres

Shabir, Q.; Pokale, A.; Loni, A.; Johnson, D. R.; Canham, L.T.; Fenollosa Esteve, Roberto; Tymczenko, Michal Konrad; Rodríguez, Marie-Isabelle; Meseguer Rico, Francisco Javier; Cros, Ana; Cantarero, Andrés (Springer Verlag (Germany), 2011-10)

[EN] Hydrogenated amorphous silicon colloids of low surface area (<5 m(2)/g) are shown to exhibit complete in-vitro biodegradation into orthosilicic acid within 10-15 days at 37 degrees C. When converted into polycrystalline ...
Mirror-image-induced magnetic modes

Xifre Perez, Elisabet; Shi, Lei; Tuzer, Turan Umut; Fenollosa Esteve, Roberto; Ramiro Manzano, Fernando; Quidant, Romain; Meseguer Rico, Francisco Javier (American Chemical Society, 2013-01)

Reflection in a mirror changes the handedness of the real world, and right-handed objects turn left-handed and vice versa (M. Gardner, The Ambidextrous Universe, Penguin Books, 1964). Also, we learn from electromagnetism ...
Monodisperse silicon nanocavities and photonic crystals with magnetic response in the optial region

Shi, Lei; Harris, Justin T.; Fenollosa Esteve, Roberto; Rodríguez, Marie-Isabelle; Lu, Xiaotang; Korgel, Brian; Meseguer Rico, Francisco Javier (Nature Publishing Group, 2013-05)

[EN] It is generally accepted that the magnetic component of light has a minor role in the light-matter interaction. The recent discovery of metamaterials has broken this traditional understanding, as both the electric and ...
Multilayer porous silicon spherical Mie resonator photodiodes with comb-like spectral response in the near infrared region

Fenollosa Esteve, Roberto; Garín, Moisés (Elsevier, 2022-11-01)

[EN] Silicon microsphere photodiodes constitute optoelectronic devices able to provide resonance-enhanced photo -current not only in the visible but also in the near infrared range by virtue of their associated Mie resonances. ...
Octahedral Molybdenum Cluster-Based Single Crystals as Fabry- Perot Microresonators

Segura-Sanchis, Elena; Fenollosa Esteve, Roberto; Rodriguez, Isabelle; Molard, Yann; Cordier, Stéphane; Feliz Rodriguez, Marta; Atienzar Corvillo, Pedro Enrique (American Chemical Society, 2022-01-05)

[EN] Single crystals built up from octahedral Mo-6 cluster units, with appropriate geometry and size, constitute Fabry-Perottype optical microcavities with well-defined resonances. Such resonances appear in the VIS-NIR ...
Optical properties of organic/inorganic perovskite microcrystals through the characterization of Fabry-Perot resonances

RAMIRO MANZANO, FERNANDO; García-Aboal, Rocío; Fenollosa Esteve, Roberto; Biasi, Stefano; Rodriguez, Isabelle; Atienzar Corvillo, Pedro Enrique; MESEGUER RICO, FRANCISCO JAVIER (The Royal Society of Chemistry, 2020-09-28)

[EN] A precise knowledge of the optical properties, specifically the refractive index, of organic/inorganic perovskites, is essential for pushing forward the performance of the current photovoltaic devices that are being ...
Porous silicon microcavities: Synthesis, characterization, and application to photonic barcode devices

Ramiro Manzano, Fernando; Fenollosa Esteve, Roberto; Xifre Perez, Elisabet; Garín Escrivá, Moisés; Meseguer Rico, Francisco Javier (SpringerOpen, 2012-09-03)

[EN] We have recently developed a new type of porous silicon we name as porous silicon colloids. They consist of almost perfect spherical silicon nanoparticles with a very smooth surface, able to scatter (and also trap) ...
Silicon Colloids: a new enabling nanomaterial

Meseguer Rico, Francisco Javier; Fenollosa Esteve, Roberto; Rodríguez, Marie-Isabelle; Xifre Perez, Elisabet; Ramiro Manzano, Fernando; Garin, M.; Tymczenko, Michal Konrad (AIP Publishing, 2011-05-15)

We have recently developed a new type of silicon structure that we refer to as a silicon colloid. This new material consists of almost perfectly spherical silicon micro- and nanoparticles with a very smooth surface. They ...
Silicon particles as trojan horses for potential cancer therapy

Fenollosa Esteve, Roberto; Garcia-Rico, Eduardo; Alvarez, Susana; Alvarez, Rosana; Yu, Xiang; Rodriguez, Isabel; Carregal-Romero, Susana; Villanueva, Carlos; Garcia-Algar, Manuel; Rivera-Gil, Pilar; de Lera, Angel R.; Parak, Wolfgang J.; Meseguer Rico, Francisco Javier; Alvarez-Puebla, Ramon A. (BioMed Central, 2014-09-16)

[EN] Background: Porous silicon particles (PSiPs) have been used extensively as drug delivery systems, loaded with chemical species for disease treatment. It is well known from silicon producers that silicon is characterized ...
Single Crystal Growth of Hybrid Lead Bromide Perovskites Using a Spin-Coating Method

García-Aboal, Rocío; Fenollosa Esteve, Roberto; Ramiro Manzano, Fernando; Rodriguez, Isabelle; Messeguer Rico, Francisco Javier; Atienzar Corvillo, Pedro Enrique (American Chemical Society, 2018-05)

[EN] Synthesis and studies of single crystals of hybrid perovskite are important for achieving a better understanding of the optoelectronic phenomena occurring in this material and for improving ongoing applications. Here, ...
Spherical silicon photonic microcavities: From amorphous to polycrystalline

Fenollosa Esteve, Roberto; Garín Escrivá, Moisés; Meseguer Rico, Francisco Javier (American Physical Society, 2016-06-16)

[EN] Shaping silicon as a spherical object is not an obvious task, especially when the object size is in the micrometer range. This has the important consequence of transforming bare silicon material in a microcavity, so ...
Thermal Emission of Silicon at Near-Infrared Frequencies Mediated by Mie Resonances

Fenollosa Esteve, Roberto; Ramiro-Manzano, Fernando; GARÍN ESCRIVÁ, MOISÉS; Alcubilla, R. (American Chemical Society, 2019-12-18)

[EN] Planck's law constitutes one of the cornerstones in physics. It explains the well-known spectrum of an ideal blackbody consisting of a smooth curve, whose peak wavelength and intensity depend on the temperature of the ...