# Polarized SERS of individual suspended carbon nanotubes by Pt-Re nanoantennas

## TL;DR

This paper introduces high-temperature resistant Re/Pt nanoantennas that enhance Raman signals of individual suspended carbon nanotubes, demonstrating their potential for advanced optical sensing applications.

## Contribution

The study designs and fabricates Re/Pt nanoantennas capable of withstanding temperatures above 800°C, enabling effective SERS of suspended carbon nanotubes.

## Key findings

- Nanoantennas exhibit a plasmonic resonance at ~670 nm.
- Enhanced Raman signals observed for individual CNTs.
- Numerical simulations confirm substrate impact on antenna performance.

## Abstract

We present optical nanoantennas designed for applications that require processing temperatures larger than 800{\deg}C. The antennas consist of arrays of Re/Pt bilayer strips fabricated with a lift-off-free technique on top of etched trenches. Reflectance measurements show a clear plasmonic resonance at approximately 670 nm for light polarized orthogonal to the strip axis. The functionality of the antennas is demonstrated by growing single-walled carbon nanotubes (CNTs) on top of the antenna arrays and measuring the corresponding Raman signal enhancement of individual CNTs. The results of the measurements are quantitatively discussed in light of numerical simulations which highlight the impact of the substrate.