Plasmonic Demultiplexer and Guiding

TL;DR

This paper proposes and demonstrates a two-dimensional plasmonic demultiplexer on a gold film that effectively couples, disperses, and guides surface plasmon polaritons with high resolution, enabling wavelength multiplexing and sensing.

Contribution

It introduces a novel plasmonic demultiplexer design with experimental validation, achieving high resolution and multi-channel SPP routing for integrated plasmonic applications.

Findings

Achieved a 10 nm spectral resolution.

Successfully routed different wavelengths into separate SPP waveguides.

Demonstrated potential for integrated plasmonic circuits and spectroscopy.

Abstract

Two-dimensional plasmonic demultiplexers for surface plasmon polaritons (SPPs), which consist of concentric grooves on a gold film, are proposed and experimentally demonstrated to realize light-SPP coupling, effective dispersion and multiple-channel SPP guiding. A resolution as high as 10 nm is obtained. The leakage radiation microscopy imaging shows that the SPPs of different wavelengths are focused and routed into different SPP strip waveguides. The plasmonic demultiplexer can thus serve as a wavelength division multiplexing element for integrated plasmonic circuit and also as a plasmonic spectroscopy or filter.