In this paper, we consider plasmonic nanoantennas with different elliptical metal rods embedded in a two-arm grating. Elliptical metal rods support dipolar localized plasmon resonance with a localized plasmon resonance frequency that is affected with different metal materials. We discuss the properties and parameters of different elliptical metal rods using finite-difference time-domain method in nanoantenna arrays. And we propose a design of photonic-plasmonic nanoantennas, which obtain electrical field properties at the subwavelength focal point in nanoantenna arrays.
The authors have demonstrated a surface plasmon device composed of a resonant optical antenna integrated on the facet of a commercial diode laser, termed a plasmonic laser antenna. This device generates enhanced and spatially confined optical near fields. Spot sizes of a few tens of nanometers have been measured at a wavelength ∼0.8μm. This device can be implemented in a wide variety of semiconductor lasers emitting in spectral regions ranging from the visible to the far infrared, including quantum cascade lasers. It is potentially useful in many applications including near-field optical microscopes, optical data storage, and heat-assisted magnetic recording.
Since the end of the Cold War, the study of European defence has been dominated by a ‘Common Security and Defence Policy (CSDP)-centric’ approach, while largely neglecting the comparative analysis ...