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Listar por palabra clave "Lenses"

Mostrando ítems 1-11 de 11

Accurate Beam Profile Characterization in THz Transmission Imaging Systems

Báez-Chorro, Miguel Ángel; Usó-Izquierdo, Manel; Vidal Rodriguez, Borja (Institute of Electrical and Electronics Engineers, 2021-09)

[EN] Beam profiling in terahertz systems based on a 4f configuration is revised to show that usual practices underestimate the beam waist due to the narrow point spread function of the detection arm. A rigorous assessment ...
Characterizing and modeling backscattering in silicon microring resonators

Ballesteros García, Guillem; Matres Abril, Joaquín; Martí Sendra, Javier; Oton Nieto, Claudio José (Optical Society of America, 2011)

We present an experimental technique to characterize back-scattering in silicon microring resonators, together with a simple analytical model that reproduces the experimental results. The model can extract all the key ...
Configuración del patrón de focalización en lentes de ultrasonidos

Pérez Bernabeu, Rubén (Universitat Politècnica de València, 2018-10-01)

En este proyecto se ha realizado un estudio acerca de las lentes Fresnel y su posible aplicación en el entorno de la medicina mediante el uso de ondas de ultrasonido. Este trabajo empieza con un desarrollo teórico de las ...
Contact Lenses on the Chromatic Reintegration Process of the Eyeballs of a Wood Sculpture

Bailão, Ana; Bidarra, Ana; Silva Pereira, Bruna; Esperança, Ana Rita; Desterro, Teresa (Editorial Universitat Politècnica de València, 2023-01-11)

[EN] Chromatic reintegration aims to decrease deterioration evidences in the artwork and retrieve the visual interpretation of its iconographic shapes and contents. This case study will focus on the chromatic reintegration ...
Design of Binary-Sequence Zone Plates in High Wavelength Domains

Fuster Escuder, José Miguel; Pérez-López, Sergio; Candelas Valiente, Pilar; Rubio Michavila, Constanza (MDPI AG, 2018)

[EN] The design of zone plates is an important topic in many areas of physics, such as optics, X-rays, microwaves or ultrasonics. In this paper, a zone plate design method, which provides high flexibility in the shaping ...
Diseño de antenas en banda de frecuencias milimétricas para sistemas de comunicaciones 5G

Arizaca Cusicuna, Dennis Noel (Universitat Politècnica de València, 2021-10-11)

[ES] El nuevo estándar de comunicaciones 5G tiene asignadas bandas a frecuencias inferiores a 6 GHz que se están desplegando en la actualidad y nuevas bandas en frecuencias milimétricas, entre 24.5 GHz y 52.6 GHz, que ...
Modulación de haces de ultrasonidos mediante la modificación de lentes de Fresnel

Sujar Cost, Rafael (Universitat Politècnica de València, 2023-10-05)

[ES] El presente trabajo pretende analizar y caracterizar numérica y experimentalmente la capacidad de modular haces de ultrasonidos mediante la modificación de lentes de Fresnel. En primer lugar, se describirán las ...
Near-Field Interference for the Unidirectional Excitation of Electromagnetic Guided Modes

Rodríguez Fortuño, Francisco José; Marino, Giuseppe; Ginzburg, Pavel; O’Connor, Daniel; Martínez Abietar, Alejandro José; Wurtz, Gregory A.; Zayats, Anatoly V. (American Association for the Advancement of Science, 2013-04-19)

Wave interference is a fundamental manifestation of the superposition principle with numerous applications. Although in conventional optics, interference occurs between waves undergoing different phase advances during ...
Numerical simulation and laboratory measurements on the influence of fractal dimension on the acoustic beam modulation of a Polyadic Cantor Fractal lenses

Tarrazó-Serrano, Daniel; Castiñeira Ibáñez, Sergio; Candelas Valiente, Pilar; Fuster Escuder, José Miguel; Rubio Michavila, Constanza (Elsevier, 2019)

[EN] The possibility of modulating the ultrasound beam produced by a transducer through lenses has become an important task. The fact that these lenses are flat, facilitates their design, construction and applications. ...
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 ...
Transmission, reflection and absorption in Sonic and Phononic Crystals

Cebrecos Ruiz, Alejandro (Universitat Politècnica de València, 2015-10-26)

[EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid or fluid. By controlling the geometry and the impedance contrast ...