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Publications

2019

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

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

Publication
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

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

Publication
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.

2019

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

Authors
Mendonça, JT; Guerreiro, A; Ali, S;

Publication
The Astrophysical Journal

Abstract

2019

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

Authors
Mendonça, JT; Guerreiro, A; Ali, S;

Publication
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.

2018

Superfluidity of light in nematic liquid crystals

Authors
Ferreira, TD; Silva, NA; Guerreiro, A;

Publication
Physical Review A

Abstract
Optical analog experiments have captured a lot of interest in recent years by offering a strategy to test theoretical models and concepts that would be otherwise untestable. The approach relies on the similarity between the mathematical model for light propagation in nonlinear optical media and the model to be mimicked. In particular, the analogy between light and a quantum fluid with superfluidlike properties has been studied extensively. Still, while most of these studies use thermo-optical media to perform these experiments, the possibility of using nematic liquid crystals to perform such optical analog experiments remains to be analyzed. This work explores how this medium can constitute an alternative to materials more commonly used in optical analogs, such as thermo-optical media, and how its tunable properties can be advantageous to explore and better control fluidlike properties of light. Moreover, we explore the analogy between the propagation of light and a quantum fluid, and propose a pump-probe experiment to measure the dispersion relation of the superfluid analog. © 2018 American Physical Society.

Supervised
thesis

2017

Development of a simulator of light-matter interaction using GPGPU: from plasmas to atomic gases

Author
Miguel Boaventura Teixeira Gomes

Institution
UP-FCUP

2017

Nano-Plasmonics: a stepping stone into Non-linear Quantum Plasmonics

Author
Rúben Azinheira Alves

Institution
UP-FCUP

2017

Optical fiber tools for single cell trapping and manipulation

Author
Ana Rita da Silva Rodrigues Ribeiro

Institution
UP-FCUP

2017

Research project: Heterogeneous Supercomputation for Non-equilibrium Mesoscale Optics

Author
Nuno Miguel Azevedo Silva

Institution
UP-FCUP

2017

Development of a solver of the Maxwell-Bloch equations with GPGPUs

Author
João Paulo Couto Costa

Institution
UP-FCUP