Surface plasmon polariton modes in coaxial metal-dielectric-metal waveguides

• الحاوية / القاعدة: New Journal of Physics
• المؤلفون الرئيسيون: Marie Anne van de Haar, Ruben Maas, Benjamin Brenny, Albert Polman
• التنسيق: مقال
• اللغة: الإنجليزية
• منشور في: IOP Publishing 2016-01-01
• الموضوعات: metamaterials; plasmonics; cathodoluminescence spectroscopy; waveguides
• الوصول للمادة أونلاين: https://doi.org/10.1088/1367-2630/18/4/043016
• تدمد: 1367-2630

We explore the optical properties of a coaxial plasmonic metamaterial consisting of hollow dielectric cylinders with a diameter of 100–250 nm and a ring wall width of 10–50 nm, embedded in metal. We investigate the modal electric and magnetic fields and dispersion relation for different geometries and material choices of a single coaxial channel by using realistic values for all design parameters. The Fabry–Pérot modes of a finite thickness slab are investigated with cathodoluminescence spectroscopy and explained by extracting the mode index from FDTD simulations. Furthermore, we investigate the coupling behavior of adjacent coaxes inside a hexagonal array. We find a change from the single-ring dispersion relation for coaxes with a ring-to-ring distance smaller than 20 nm.