Surface-enhanced photoluminescence and Raman spectroscopy of single molecule confined in coupled Au bowtie nanoantenna

• DOI: 10.1088/1361-6528/ad1afd
• Publication Date: 2024-01-04T22:40:16Z
• Authors: Huan Pei; Weifeng Peng; Jiale Zhang; Jiaxin Zhao; Jialu Qi; Changjian Yu; Jing Li; Yong Wei
• Keywords: Photodetection; Quantum yield

Optical nanoantennas possess broad applications in the fields of photodetection, environmental science, biosensing and nonlinear optics, owing to their remarkable ability enhance confine optical field at nanoscale. In this article, we present a theoretical investigation surface-enhanced photoluminescence spectroscopy for single molecules confined within novel Au bowtie nanoantenna, covering wavelength range from visible near-infrared spectral regions. We employ finite element method quantitatively study enhancement properties plasmonic field, quantum yield, Raman scattering fluorescence. Additionally, systematically examine contribution nonlocal dielectric response gap mode aiming gain better understanding fluorescence mechanism. Our results demonstrate that altering configuration nanoantenna has significant impact on sensitivity. The plays crucial role reducing yield corresponding intensity when distance is less than 3 nm. However, substantial excitation can effectively overcome quenching intensity. By optimizing configuration, maximum be turned 9 10 magnitude orders regions, 4 enhancement, respectively. spatial resolutions 0.8 nm 1.5 are also achieved, calculated not only provide guidance design application new nanoantennas, but contribute expanding technology region.