Tooth-shaped plasmonic waveguide filters with nanometeric sizes

TL;DR

This paper introduces a novel, ultra-compact tooth-shaped plasmonic waveguide filter with nanometer dimensions, demonstrating its wavelength filtering capabilities through analytical modeling and numerical simulations.

Contribution

It proposes a new design for a nanometer-scale plasmonic filter based on a tooth-shaped MIM waveguide, with an analytic model and numerical validation.

Findings

The filter exhibits wavelength filtering characteristics.

The transmission trough wavelength relates linearly to tooth depth.

The transmission trough wavelength relates nonlinearly to tooth width.

Abstract

A novel nanometeric plasmonic filter in a tooth-shaped Metal-Insulator-Metal waveguide is proposed and demonstrated numerically. An analytic model based on the scattering matrix method is given. The result reveals that the single tooth-shaped filter has a wavelength filtering characteristic and an ultra-compact size in the length of a few hundred nanometers, compared to grating-like SPPs filters. Both analytic and simulation results show that the wavelength of the trough of the transmission has linear and nonlinear relationships with the tooth depth and the tooth width, respectively. The waveguide filter could be utilized to develop ultra-compact photonic filters for high integration.