Work

Keeping dark modes dark: Reducing the effects of symmetry breaking at oblique incidence

Year: 2024

Type: article

Abstract: Dark modes are defined by their lack of radiative coupling to the far field. However, the modes can be made to couple to far field radiation by symmetry breaking. For a resonant dimer, obliquely incident waves can create a phase difference in the currents between the elements, resulting in symmetry breaking. This work reduces symmetry breaking effects by minimizing the size of a dimer of dipolar elements with respect to its resonant wavelength. We obtain a mode that can experimentally be excited from the near field but has negligible excitation in the far field for obliquely incident waves. Such a mode could have use in wireless security applications.

Source: Applied Physics Letters

DOI: 10.1063/5.0227519

Authors: Kieran J. Cowan, Simon J. Berry, Alastair P. Hibbins, Alexander W. Powell

Institutions: University of Exeter, Qinetiq (United Kingdom)

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Funders: QinetiQ, Engineering and Physical Sciences Research Council

Awards: Industrial CASE Account-University of Exeter 2022, G8231966274