Morphological effects on surface plasmon polaritons at the planar interface of a metal and a columnar thin film The Planar Interface Of A Metal And A Columnar Thin Film

TL;DR

This study investigates how the morphology of a columnar thin film influences surface plasmon polaritons at a metal interface, revealing that tilt angle affects phase speed, confinement, and propagation range, with implications for engineered plasmonic devices.

Contribution

It provides new insights into the dependence of SPP characteristics on CTF morphology, especially tilt angle, which was not thoroughly explored before.

Findings

SPP phase speed varies with column tilt angle

Propagation range decreases with increased tilt

Porous CTF-metal interfaces offer tunable plasmonic properties

Abstract

Surface plasmon polaritons (SPPs) at the interface of a columnar thin film (CTF) and metal exist over a range of propagation directions relative to the morphology of the CTF which depends on the tilt of the columns in the CTF. The phase speed of the SPP wave varies mainly as a function of the tilt of the CTF columns. Both the confinement of the SPP wave to the interface and the decay of the SPP wave along the direction of propagation depend strongly on the direction of propagation relative to the morphologically significant plane of the CTF. The greater the columnar tilt in relation to the interface, the shorter is the range of propagation. Because of its porosity and the ability to engineer this biaxial dielectric material, the CTF-metal interface may be more attractive than traditional methods of producing SPPs.