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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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Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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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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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.