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Detalhes

Detalhes

002
Publicações

2020

Dissipative solitons in an atomic medium assisted by an incoherent pumping field

Autores
Silva, NA; Almeida, AL; Ferreira, TD; Guerreiro, A;

Publicação
Journal of Physics B: Atomic, Molecular and Optical Physics

Abstract

2020

Using numerical methods from nonlocal optics to simulate the dynamics of N -body systems in alternative theories of gravity

Autores
Ferreira, TD; Silva, NA; Bertolami, O; Gomes, C; Guerreiro, A;

Publicação
Physical Review E

Abstract

2020

Bridging the hydrodynamic Drude model and local transformation optics theory

Autores
Alves, RA; Guerreiro, A; Navarro Cia, M;

Publicação
PHYSICAL REVIEW B

Abstract
The recent ability of plasmonic nanostructures to probe subnanometer and even atomic scales demands theories that can account for the nonlocal dynamics of the electron gas. The hydrodynamic Drude model (HDM) captures much of the microscopic dynamics of the quantum mechanical effects when additional boundary conditions are considered. Here, we revisit the HDM under the Madelung formalism to reexpress its coupled system of equations as a single nonlinear Schrodinger equation in order to have a natural quantum mechanical description of plasmonics. Specifically, we study the response of two overlapping nanowires with this formalism. We ensure that an proposed frame concurs with classical electrodynamics when the local response approximation holds in the plasmonic system by finding the correction needed.

2019

New Trends in the Simulation of Nanosplasmonic Optical D-Type Fiber Sensors

Autores
Guerreiro, A; Santos, DF; Baptista, JM;

Publicação
SENSORS

Abstract
This article presents a review of the numerical techniques employed in simulating plasmonic optical sensors based on metal-dielectric nanostructures, including examples, ranging from conventional D-type fiber sensors, to those based on photonic crystal D-type fibers and incorporating metamaterials, nanowires, among other new materials and components, results and applications. We start from the fundamental physical processes, such as optical and plasmonic mode coupling, and discuss the implementation of the numerical model, optical response customization and their impact in sensor performance. Finally, we examine future perspectives.

2019

Photon Bubbles in a Self-gravitating Dust Gas: Collective Dust Interactions

Autores
Mendonca, JT; Guerreiro, A; Ali, S;

Publicação
ASTROPHYSICAL JOURNAL

Abstract
We consider broadband radiation interacting with a gas of self-gravitating dust grains. We show that photon-bubble formation can occur, due to a modified Jeans instability, which will imply the formation of two different kinds of dust density perturbations. This could be useful for understanding the B-mode signal observed in the CMB polarization survey, and other astrophysical processes, such as the formation of protoplanets and voids in dust clouds.

Teses
supervisionadas

2018

Superfluidity of Light: a Stepping Stone Towards Optical Analogues in Nematic Liquid Crystals

Autor
Tiago David da Silva Ferreira

Instituição
UP-FCUP

2018

Soliton Excitations in Open Systems using GPGPU Supercomputing

Autor
André Lopes de Almeida

Instituição
UP-FCUP

2018

Extending the applicability of the nonlinear Fourier transform: from pattern analysis to artificial intelligence

Autor
André Agostinho Monteiro Pereira

Instituição
UP-FCUP

2018

Solving the Time-Independent Generalised Nonlinear Schrödinger Equation using Deep Learning

Autor
Inês Sofia Carneiro Madureira

Instituição
UP-FCUP

2017

Optical fiber tools for single cell trapping and manipulation

Autor
Ana Rita da Silva Rodrigues Ribeiro

Instituição
UP-FCUP