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Browsing by Subject "Refractive index"

Now showing items 1-17 of 17

Brillouin-Induced Dynamic Arbitrary Birefringence

Samaniego-Riera, Diego; Zoireff, Gustavo; Vidal Rodriguez, Borja (Institute of Electrical and Electronics Engineers, 2021-04-01)

[EN] A nonlinear method to generate and control both the type and magnitude of the birefringence, as well as differential group delay (DGD) in optical fibers is studied. Experiments show that both parameters of birefringence ...
Correlation of the refractive index change at the surface and inside phosphate glass upon femtosecond laser irradiation

Puerto Garcia, Daniel; Siegel, Jan; Ferrer, Andres; Hernandez-Rueda, Javier; Solis, Javier (Optical Society of America, 2012-10)

[EN] A study of the surface modification induced by single femtosecond laser pulses in phosphate glass has revealed surface swelling at fluences just below the ablation threshold. This behavior is different from that ...
Diseño, fabricación y análisis de prestaciones de un biosensor fotónico basado en fibra óptica

Mena Ortega, Sergio (Universitat Politècnica de València, 2021-03-25)

[ES] Existen diferentes tipos de biosensores basados en fibra óptica. En este trabajo vamos a centrarnos en biosensores de fibra óptica ahusada en los que se modifica la estructura de la fibra. De esta manera se produce ...
Double Laser for Depth Measurement of Thin Films of Ice

Domingo Beltran, Manuel; Luna Molina, Ramón; Satorre, M. Á.; Santonja Moltó, Mª del Carmen; Millán Verdú, Carlos (MDPI, 2015-10)

The use of thin films is extensive in both science and industry. We have created an experimental system that allows us to measure the thicknesses of thin films (with typical thicknesses of around 1 μm) in real time ...
Dual-band double-negative-index fishnet metamaterial at millimeter-waves

Navarro-Cia, M.; García Meca, Carlos; Beruete, M.; Martínez Abietar, Alejandro José; Sorolla, M. (Optical Society of America, 2011)

[EN] An effective negative refractive index (NRI) is demonstrated and experimentally verified for the first two propagation bands of a fishnet-like metamaterial at millimeter-wave frequencies. The dual-band NRI behavior ...
Experimental Measurement of Carbon Dioxide Polarizability in the Solid State

Domingo Beltran, Manuel; Luna Molina, Ramón; Satorre, M. Á.; Santonja Moltó, Mª del Carmen; Millán Verdú, Carlos (Springer-Verlag, 2015)

[EN] We have experimentally determined the polarizability of using the Lorentz-Lorenz equation by simultaneously measuring the density and the refractive index. The conditions were solid phase, mbar pressure, and temperature ...
Highly-sensitive chemical detection in the infrared regime using plasmonic gold nanocrosses

Rodríguez Fortuño, Francisco José; Martínez Marco, Mª Luz; Tomás Navarro, Begoña; Ortuño Molinero, Rubén; Martí Sendra, Javier; Martínez Abietar, Alejandro José; Rodríguez Cantó, Pedro Javier (American Institute of Physics, 2011)

In this work, we report the design, fabrication, and characterization of gold nanocrosses for chemosensing purposes. The nanocrosses are designed to exhibit a localized surface plasmon resonance which is very sensitive to ...
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 ...
Low-Loss multilayered metamaterial exhibiting a negative index of refraction at visible wavelengths

García Meca, Carlos; Hurtado Montañés, Juan; Martí Sendra, Javier; Martínez Abietar, Alejandro José; Dickson, Wayne; Zayats, Anatoly V. (American Physical Society, 2011-02-11)

We experimentally demonstrate a low-loss multilayered metamaterial exhibiting a double-negative refractive index in the visible spectral range. To this end, we exploit a second-order magnetic resonance of the so-called ...
Measurement of the group velocity of light in sea water at the ANTARES site

Adrián Martínez, Silvia; Al Samarai, I; Albert, A.; André, A; Anghinolfi, M.; Anton, G; Anvar, S.; Ardid Ramírez, Miguel; Bou Cabo, Manuel; Camarena Femenia, Francisco; Ferri García, Marcelino; Larosa, Giuseppina; Martínez Mora, Juan Antonio (Elsevier, 2012-04)

The group velocity of light has been measured at eight different wavelengths between 385 nm and 532 nm in the Mediterranean Sea at a depth of about 2.2 km with the ANTARES optical beacon systems. A parametrisation of the ...
Multiple scattering formulation of two-dimensional acoustic and electromagnetic metamaterials

Torrent Martí, Daniel; Sánchez-Dehesa Moreno-Cid, José (IOP Publishing: Open Access Journals, 2011-09-09)

A multiple scattering formulation of two-dimensional (2D) acoustic metamaterials is presented. This approach is comprehensive and can lead to frequency-dependent effective parameters (scalar bulk modulus and tensorial mass ...
Optimization of a label-free biosensor vertically characterized based on a periodic lattice of high aspect ratio SU-8 nano-pillars with a simplified 2D theoretical model

Casquel Del Campo, Rafael; Holgado, Miguel; Sanza, F.J.; LAGUNA, MARI FE; BARRIOS, C.A.; López-Romero, D.; Ortega Higueruelo, Francisco José; Bañuls Polo, María-José; Puchades, Rosa; Maquieira Catala, Ángel (John Wiley & Sons, 2011)

[EN] We have recently demonstrated a biosensor based on a lattice of SU8 pillars on a 1 ¿m SiO 2/Si wafer by measuring vertically reflectivity as a function of wavelength. The biodetection has been proven with the combination ...
Partial transmutation of singularities in optical instruments

Perczel, Janos; García Meca, Carlos; Leonhardt, Ulf (IOP Publishing, 2011-07)

Some interesting optical instruments such as the Eaton lens and the invisible sphere require singularities of the refractive index for their implementation. We show how to transmute those singularities into harmless ...
Refractive Index and Temperature Sensing Using Inter-Core Crosstalk in Multicore Fibers

Madrigal-Madrigal, Javier; Barrera Vilar, David; Sales Maicas, Salvador (Institute of Electrical and Electronics Engineers, 2019-09-15)

[EN] Multicore optical fibers are of great interest in the optical sensing field. Their core diversity and spatial distribution enable the development of sensing mechanisms that are not possible in single-core fibers. In ...
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 ...
The shape influence on the overall single scattering properties of a sample in random orientation

Vilaplana Cerda, Rosario Isabel; Luna Molina, Ramón; Guirado, D. (Elsevier, 2011)

[EN] In order to identify the type of scattering profile that corresponds to some specific shapes, we have performed calculations of some scattering properties for those shapes with a fixed size distribution. Aggregates ...
Universal Characteristic Equation for Multi-Layer Optical Fibers

García-Cortijo, Sergi; Gasulla Mestre, Ivana (Institute of Electrical and Electronics Engineers, 2020-08)

[EN] Optical fibers featuring multi-layer refractive index profiles have been widely investigated and developed in a variety of scenarios, including space-division multiplexing transmission, fiber sensing, loss and dispersion ...