2024-03-19T01:18:37Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2189892021-10-27T11:24:55Zcom_10261_93com_10261_4col_10261_346
http://hdl.handle.net/10261/218989
10.1515/nanoph-2019-0502
399794
Active analog tuning of the phase of light in the visible regime by bismuth-based metamaterials
Walter de Gruyter
2020
artículo
Garcia-Pardo, Marina
Nieto-Pinero, Eva
Petford-Long, Amanda K.
Serna, Rosalía
rp14361
Toudert, Johann
Phase change material
Metamaterial
Bismuth
Phase
Visible
2020-02-20
12 pags., 6 figs.; 1 tab. 1 app.
The active and analog tuning of the phase of light by metamaterials is needed to boost the switching performance of photonic devices. However, demonstrations of this type of tuning in the pivotal visible spectral region are still scarce. Herein, we report the active analog tuning of the phase of visible light reflected by a bismuth (Bi)-based metamaterial, enabled by a reversible solid-liquid transition. This metamaterial, fabricated by following a lithography-free approach, consists of two-dimensional assemblies of polydisperse plasmonic Bi nanostructures embedded in a refractory and transparent aluminum oxide matrix. The analog tuning of the phase is achieved by the controlled heating of the metamaterial to melt a fraction of the nanostructures. A maximum tuning of 320° (1.8 π) is observed upon the complete melting of the nanostructures at 230°C. This tuning is reversible by cooling to 25°C. In addition, it presents a wide hysteretic character due to liquid Bi undercooling. This enables the phase achieved by this analog approach to remain stable over a broad temperature range upon cooling and until re-solidification occurs around 100°C. Therefore, Bi-based metamaterials are endowed with analog optical memory capabilities, which are appealing for a wide range of applications, including optical data storage with enhanced information density or bistable photonic switching with a tunable "on" state.
Ministerio de Ciencia, Innovación y Universidades (España)
National Science Foundation (US)
Department of Energy (US)
Comunidad de Madrid
Nanophotonics
2020
9
885
896