Dielectric nanoantenna as an efficient and ultracompact demultiplexer for surface waves

Abstract

Nanoantennas for highly efficient excitation and manipulation of surface waves at nanoscale are key elements of compact photonic circuits. However, previously implemented designs employ plasmonic nanoantennas with high Ohmic losses, relatively low spectral resolution, and complicated lithographically made architectures. Here we propose an ultracompact and simple dielectric nanoantenna (silicon nanosphere) allowing for both directional launching of surface plasmon polaritons on a thin gold film and their demultiplexing with a high spectral resolution. We show experimentally that mutual interference of magnetic and electric dipole moments supported by the dielectric nanoantenna results in opposite propagation of the excited surface waves whose wavelengths differ by less than 50 nm in the optical range. Broadband reconfigurability of the nanoantennas operational range is achieved simply by varying the diameter of the silicon sphere. Moreover, despite subwavelength size ($<\lambda /3$) of the proposed nanoantennas, they demonstrate highly efficient and directional launching of surface waves both in the forward and backward directions with the measured front-to-back ratio having a contrast of almost two orders of magnitude within a 50 nm spectral band. Our lithography-free design has great potential as highly efficient, low-cost, and ultracompact demultiplexer for advanced photonic circuits.

arXiv commentadded relevant references; fixed typos in Supplementary eq. 8,9,11

References in corpus (18)

• Graphene plasmonics
• Two-Dimensional Material Nanophotonics
• Spin-orbit interactions of light
• Chiral Quantum Optics
• High-efficiency light-wave control with all-dielectric optical Huygens' metasurfaces
• Directional visible light scattering by silicon nanoparticles
• Magnetic light
• Quantum spin Hall effect of light
• Magnifying superlens in the visible frequency range
• Efficient unidirectional nanoslit couplers for surface plasmons
• Demonstration of zero optical backscattering from single nanoparticles
• Chirality of nanophotonic waveguide with embedded quantum emitter for unidirectional spin transfer
• Generalized Brewster-Kerker effect in dielectric metasurfaces
• Hybrid waves localized at hyperbolic metasurfaces
• Laser fabrication of crystalline silicon nanoresonators from an amorphous film for low-loss all-dielectric nanophotonics
• Strong Asymmetric Surface Plasmon Polariton Emission by a Dipole Emitter near a Metal Surface
• Direct image of surface plasmon-coupled emission by leaky radiation microscopy
• All-optical switching and unidirectional plasmon launching with electron-hole plasma driven silicon nanoantennas

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