Pyramid-shaped ultra-stable gold-helix metamaterial as an efficient mid-infrared circular polarizer

Abstract

Gold-helix metamaterials play a crucial role in tailoring chiral light-matter interactions. However, conventional gold helices with weak mechanical stability are easy to break or collapse, resulting in device failure. Here, we propose a novel ultra-stable pyramid-shaped gold-helix metamaterial in which we utilize photoresist walls to support tapered gold helices to address this challenge. Numerical results show that the proposed ultra-stable metamaterial can work as an efficient mid-infrared circular polarizer in almost two octaves (from 5.82μm to16.76μm) with a maximum extinction ratio greater than 25dB. The device has many potential applications in circular polarization-dependent optical systems without worrying about vibrations.

Chiro-plasmon responses of x-shaped titanium nitride (TiN) nanoarrays by numerical simulations

“…By combining chiral metamaterials with plasmonic materials, their chiral optical responses, such as circular dichroism (CD) are able to be tuned and regulated, which take advantage of both the unique plasmon properties and chiral metamaterials. Chiral plasmon metamaterials have found broad applications in various fields such as chiral sensing [2][3][4], optical devices [5,6], analytical chemistry [7][8][9], and so on [10][11][12][13][14]. As one of the crucial parameters of chiral optical response, CD is defined as the difference in the absorption of chiral structures illuminated by left-handed and right-handed circularly polarized lights [15], and it is also reported to be estimated by the spectra difference in the scattering, extinction and/or transmittance spectra [16][17][18].…”

The total suppression of light reflection from a one-dimensional photonic crystal by a two-dimensional array of nanoparticles

“…One of the unusual manifestations of plasmon resonance response is the resonant effective permittivity of metal-dielectric nanocomposites (3D arrays of NPs embedded in a host material), whereas the optical characteristics of the initial materials have no resonant features [7][8][9][10]. The well-established properties of NP arrays have been put to use in the last decades for the design of sensors [11], anti-reflection optical coatings [12,13], polarization-sensitive structures [6,8,14,15], filters and absorbers [6,12,16] with thickness less than light wavelength.…”