# Experimental Investigation of Stub Resonators Built in Plasmonic Slot Waveguides

## TL;DR

This paper experimentally investigates stub resonators embedded in plasmonic slot waveguides, demonstrating fabrication, measurement, and modeling techniques that advance their potential use in optical interconnects and sensors.

## Contribution

It introduces a fabrication and measurement approach for stub resonators in plasmonic waveguides, validated by a scattering matrix model, enabling further development of these devices.

## Key findings

- Model agrees well with measured data
- Resonators show potential for optical sensing
- Fabrication method suitable for telecom wavelengths

## Abstract

In this work, we focus on stub resonators embedded in plasmonic slot waveguides. The resonators have potential applications in optical interconnects and sensors. We fabricate the samples by electron beam lithography and lift-off. We use a scattering matrix based model to quantify the optical power output from the samples. We measure the properties of the resonators by coupling light in and out of the slot waveguides by optical antennas, making use of a cross-polarization based setup utilizing a supercontinuum source and a high numerical aperture objective lens operating in the telecom-wavelength range. Our model agrees well with the measured data. Further development on the stub resonators can be made by using the methods in this paper.