Plasmon-enhanced single molecular optical trapping detected by super-resolution imaging

Yasutaka Kitahama

doi:10.1117/12.2593489

1 August 2021 Plasmon-enhanced single molecular optical trapping detected by super-resolution imaging

Yasutaka Kitahama

Proceedings Volume 11803, Enhanced Spectroscopies and Nanoimaging 2021; 118030G (2021) https://doi.org/10.1117/12.2593489
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

On and near the noble metal nanodimer, even single molecule can be detected by surface-enhanced Raman scattering and fluorescence (SERS and SEF), respectively. The positions of the SERS and SEF-active single molecule were observed beyond the diffraction limit by super-resolution imaging. The spatial fluctuation becomes narrower by more intense excitation laser light. The laser intensity dependence of the spatial fluctuation was observed not in the large aggregate but in the nanodimer. It indicates the single molecular optical trapping via plasmon resonance. Moreover, the intensities of single pulse signals in the blinking SERS and SEF were barely fluctuated under the intense excitation light. The power spectral density of the fluctuated positions in the optically trapping shows a line. It represents not harmonic but random movement of the optically trapped single molecule, which is consistent with the power law analysis of the blinking SERS.

Conference Presentation

Citation Download Citation

Yasutaka Kitahama "Plasmon-enhanced single molecular optical trapping detected by super-resolution imaging", Proc. SPIE 11803, Enhanced Spectroscopies and Nanoimaging 2021, 118030G (1 August 2021); https://doi.org/10.1117/12.2593489

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