February 16, 2024
Journal Article

Subnanometer Visualization of Spatially Varying Local Field Resonances that Drive Tip-Enhanced Optical Spectroscopy

Abstract

Our knowledge of the electromagnetic fields that power modern nanoscale optical measurements, including (non)linear tip-enhanced Raman and photoluminescence, chiefly stems from numerical simulations. Aside from idealized in silico vs heterogeneous (nano)structures in the laboratory, challenges in quantitative descriptions of nanoscale light-matter interactions more generally stem from the very nature of the problem, which lies at the interface of classical and quantum theories. This is particularly the case in ultrahigh spatial resolution measurements that are sensitive to local optical field variations that take place on sub-nanometer length scales. This work approaches this challenge through extinction-based spectral nano-imaging experiments. We demonstrate

Published: February 16, 2024

Citation

Wang C., A.V. Krayev, and P.Z. El-Khoury. 2023. Subnanometer Visualization of Spatially Varying Local Field Resonances that Drive Tip-Enhanced Optical Spectroscopy. Nano Letters 23, no. 19:9114–9118. PNNL-SA-189259. doi:10.1021/acs.nanolett.3c03028