Work

Enhancement of Molecular Coherent Anti-Stokes Raman Scattering with Silicon Nanoantennas

Year: 2022

Type: article

Abstract: Surface-enhanced coherent anti-Stokes Raman scattering (SE-CARS) takes advantage of surface plasmon resonances supported on metallic nanostructures to amplify the coherent Raman response of target molecules. While these metallic antennas have found significant success in SE-CARS studies, photoinduced morphological changes to the nanoantenna under ultrafast excitation introduce significant hurdles in terms of stability and reproducilibty. These hurdles need to be overcome in order to establish SE-CARS as a reliable tool for rapid biomolecular sensing. Here, we address this challenge by performing molecular CARS measurements enhanced by nanoantennas made from high-index dielectric particles with more favorable thermal properties. We present the first experimental demonstration of enhanced molecular CARS signals observed at Si nanoantennas, which offer much improved thermal stability compared to their metallic counterparts.

Source: Nano Letters

DOI: 10.1021/acs.nanolett.2c02040

Authors: Shamsul Abedin, Yong Li, Abid Anjum Sifat, Khokan Roy, Eric O. Potma

Institution: University of California, Irvine

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: National Institute of General Medical Sciences, Division of Civil, Mechanical and Manufacturing Innovation

Awards: High-resolution spectroscopic imaging with infrared nonlinear optical (IR-NLO) microscopy, G5092822943