Abstract
We study the effect of oblique illumination on the functioning of a plasmonic nanoantenna for chiral light. The antenna is designed to receive a structured beam of light and produce a nanosized near-field distribution that possesses nonzero orbital angular momentum. The design consists of metal (gold) microrods laid on a dielectric surface and is compatible with well-developed nanofabrication techniques. Experimental arrangements often require such an antenna to operate in a tilted geometry, where input light is incident on the antenna at an oblique angle. We analyze the limitations that the angled illumination imposes and discuss approaches to mitigate these limitations. Through our numerical simulations, we find that tilt angles require modifications to the antenna design. Our analysis can guide current and future experimental configurations to push the limits of resolution and sensitivity.
Highlights
IntroductionTechnologies that use electronic transport have the capability to distinguish and use small geometries, limited by quantum confinement, which can reach values around 1 nm in spatial resolution [2]
Structured beams with an orbital angular momentum have been applied to increase the amount of encoded information [5,6]; their use in conjunction with plasmonic nanoantennae is of particular interest and will result in confined field structures with sizes well beyond the diffraction limit [7]
To gain some intuition the details of the Laguerre–Gauss beam, the plasmonic antenna, and the electric field proand visualization, we constructed a file [29] can be analyzed by finite-difference time-domain (FDTD) [23] and by finite eletwo-arm dipole antenna with a geometry of two 500 nm rods and a gap of 100 nm, which ment implemented in Mathematica® or COMSOL®
Summary
Technologies that use electronic transport have the capability to distinguish and use small geometries, limited by quantum confinement, which can reach values around 1 nm in spatial resolution [2]. They have a limited frequency bandwidth, defined by electron mobility and device size. The plasmonic nanostructure geometries with the development of nanofabrication tools can control the near field to induce topological charge and plasmonic vortex [8,10] Such geometry of plasmonic nanostructures with the combination of dynamic phases can tune the orbital angular momentum of the surface plasmon [11]
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