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Tuning plasmon induced reflectance with hybrid metasurfaces

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Article number29
JournalPhotonics
Volume6
Issue number1
DOIs
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed

Abstract

Electrically tunable metasurfaces with graphene offer design flexibility to efficiently manipulate and control light. These metasurfaces can be used to generate plasmon-induced reflectance (PIR), which can be tuned by electrostatic doping of the graphene layer. We numerically investigated two designs for tunable PIR devices using the finite difference time-domain (FDTD) method. The first design is based on two rectangular antennas of the same size and a disk; in the second design, two parallel rectangular antennas with different dimensions are used. The PIR-effect was achieved by weak hybridization of two bright modes in both devices and tuned by changing the Fermi level of graphene. A total shift of 362 nm was observed in the design with the modulation depth of 53% and a spectral contrast ratio of 76%. These tunable PIR devices can be used for tunable enhanced biosensing and switchable systems.

Keywords

  • Plasmonics, Surface plasmon, Tunable metasurfaces

Publication forum classification

Field of science, Statistics Finland