Single-molecule-resolution ultrafast near-field optical microscopy via plasmon lifetime extension

Date

2021-06-14

Author

Ovalı, Rasim Volga
Şahin, Ramazan
Bek, Alpan
Taşgın, Mehmet Emre

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Metal nanostructures support plasmon oscillations on their surfaces, which normally decay very quickly. Nevertheless, the lifetime of these oscillations can be extended near a longer lifetime particle, e.g., a molecule. We utilize this phenomenon for ultrahigh (single-molecule) resolution ultrafast apertureless (scattering) applications. We demonstrate the phenomenon with the numerical solutions of 3D Maxwell equations. We use a nm-sized quantum emitter (QE) for the long lifetime particle. We place the QE at the apex of a metal-coated atomic force microscope tip. We illuminate the tip with a femtosecond laser. The near-field on the metal apex decays quickly. After some time, one receives the scattering signal only from the vicinity of the QE. Thus, the resolution becomes single-QE size. We propose the use of a stress-induced defect center in a 2D material as the QE. The tip indentation of the 2D material, transferred to the tip, originates a defect center located right at the sharpest point of the tip, which is exactly at its apex. Our method can equally be facilitated for single-molecule-size chemical manipulation.

Subject Keywords

Atomic force microscopy, Defects, Femtosecond lasers, Maxwell equations, Metal coatings, Plasmons

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85108145129&origin=inward
https://hdl.handle.net/11511/91202

Journal

Applied Physics Letters

DOI

https://doi.org/10.1063/5.0057812

Collections

Department of Physics, Article

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Citation Formats

R. V. Ovalı, R. Şahin, A. Bek, and M. E. Taşgın, “Single-molecule-resolution ultrafast near-field optical microscopy via plasmon lifetime extension,” Applied Physics Letters, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85108145129&origin=inward.