Design and Characterization of Plasmonic Doppler Grating for Azimuthal Angle-resolved Surface Plasmon Resonances

TL;DR

This paper introduces a two-dimensional plasmonic Doppler grating (PDG) that enables broadband, azimuthal angle-resolved surface plasmon resonances, with customizable frequency range for advanced nanophotonic applications.

Contribution

The paper presents a novel PDG design mimicking wavefronts of a moving source, allowing continuous angle-dependent photon-plasmon coupling with fully designable frequency windows.

Findings

Successful design and fabrication of PDG

Demonstration of angle-resolved surface plasmon resonances

Potential for in-plane angle-resolved nanophotonics

Abstract

We present two-dimensional plasmonic Doppler grating (PDG) for broadband azimuthal angle-resolved nanophotonic applications. The PDG consists of a set of non-concentric circular rings mimicking the wavefronts of a moving point source that exhibits Doppler Effect and thereby offers continuous azimuthal angle-dependent lattice momentum for photon-plasmon coupling. The center and span of the working frequency window are fully designable for optimal performance in specific applications. We detail the design, fabrication and optical characterization of the PDG. The design of Doppler grating provides a general platform for in-plane angle-resolved nanophotonic applications.