Controlling the broadband enhanced light chirality with L-shaped dielectric metamaterials
Year: 2024
Type: article
Abstract: The inherently weak chiroptical responses of natural materials limit their usage for controlling and enhancing chiral light-matter interactions. Recently, several nanostructures with subwavelength scale dimensions were demonstrated, mainly due to the advent of nanofabrication technologies, as a potential alternative to efficiently enhance chirality. However, the intrinsic lossy nature of metals and the inherent narrowband response of dielectric planar thin films or metasurface structures pose severe limitations toward the practical realization of broadband and tailorable chiral systems. Here, we tackle these problems by designing all-dielectric silicon-based L-shaped optical metamaterials based on tilted nanopillars that exhibit broadband and enhanced chiroptical response in transmission operation. We use an emerging bottom-up fabrication approach, named glancing angle deposition, to assemble these dielectric metamaterials on a wafer scale. The reported strong chirality and optical anisotropic properties are controllable in terms of both amplitude and operating frequency by simply varying the shape and dimensions of the nanopillars. The presented nanostructures can be used in a plethora of emerging nanophotonic applications, such as chiral sensors, polarization filters, and spin-locked nanowaveguides.
Source: Nature Communications
Authors: Ufuk Kilic, Matthew Hilfiker, Shawn Wimer, Alexander Ruder, Eva Schubert, Mathias Schubert, Christos Argyropoulos
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,790
Funders: National Science Foundation, U.S. Department of Defense, University of Nebraska-Lincoln, Division of Materials Research, Division of Civil, Mechanical and Manufacturing Innovation, Division of Electrical, Communications and Cyber Systems, Air Force Office of Scientific Research, Office of Experimental Program to Stimulate Competitive Research
Awards: G1263877917, G1286853602, The influence of doping and annealing onto the lattice dynamics, band structure and free charge carrier properties in monoclinic gallium aluminum oxide semiconductor alloys, G1523888516, G1769938192, G2011318139, G2501386473, G2749972804, G2971774010, G3033020585, G3780816079, TAS::57 3600::TAS 'THE STRAIN-STRESS RELATIONSHIPS FOR BAND GAP, PHONON AND PLASMON ENERGIES IN MONOCLINIC GA2O3 AND RELATED MATERIALS' DATED 2 MAR 1, G441682718, Semiconductor-based Terahertz Traveling Wave Amplifiers for Monolithic Integration, G4516736450, G4711139145, Broadband and tunable enhanced chiral light-matter interactions at the visible with new ultrathin helical metamaterials, G585296059, NSF-DFG: Advances in Ion-Surface Interaction-Driven Manufacturing of One-Dimensional Metal Oxide Heterostructures, G6848461113, RII Track-1: Emergent Quantum Materials and Technologies (EQUATE)
OpenAlex ID: W4393335210