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3 October 2019 Functional metamaterials for optical sensing of hydrogen
A. Guerreiro, Arlete Apolinario, Armandina Lopes, Aurelio Hierro-Rodriguez, Gerardo Aguilar, Jose Manuel Baptista, Nuno A. Silva, Orlando Frazão, Paula Virginia Quiterio, Pedro Jorge, Pedro Rodrigues, Suellen Silveira Moraes, Susana Silva, Tiago D. Ferreira, Jose Luis Santos, João Pedro Araujo
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Proceedings Volume 11207, Fourth International Conference on Applications of Optics and Photonics; 1120724 (2019) https://doi.org/10.1117/12.2527672
Event: IV International Conference on Applications of Optics and Photonics (AOP 2019), 2019, Lisbon, Portugal
Abstract
We present the design, fabrication and optical characterization of functional metamaterials for optical sensing of Hydrogen based on inexpensive self-assembly processes of metallic nanowires integrated in nanoporous alumina templates[37-42]. The optical properties of these materials strongly depend on the environmental concentration or partial pressure of hydrogen and can be used to develop fully optical sensors that reduce the danger of explosion. Optical metamaterials are artificial media, usually combining metallic and dielectric sub-wavelength structures, that exhibit optical properties that cannot be found in naturally occurring materials. Among these, functional metamaterials offer the added possibility of altering or controlling these properties externally after fabrication, in our case by contact with a hydrogen rich atmosphere. This dependency can be used to design[43-45] and develop optical sensors that respond to this gas or to chemical compounds that contain or release hydrogen.

In this paper we present some designs for hydrogen functional metamaterials and discuss the main parameters relevant in the optimization of their response.
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A. Guerreiro, Arlete Apolinario, Armandina Lopes, Aurelio Hierro-Rodriguez, Gerardo Aguilar, Jose Manuel Baptista, Nuno A. Silva, Orlando Frazão, Paula Virginia Quiterio, Pedro Jorge, Pedro Rodrigues, Suellen Silveira Moraes, Susana Silva, Tiago D. Ferreira, Jose Luis Santos, and João Pedro Araujo "Functional metamaterials for optical sensing of hydrogen", Proc. SPIE 11207, Fourth International Conference on Applications of Optics and Photonics, 1120724 (3 October 2019); https://doi.org/10.1117/12.2527672
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KEYWORDS
Palladium
Metamaterials
Hydrogen
Optical properties
Refractive index
Sensors
Nanowires
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