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Spatial Resolution in Nanoscale TERS Imaging: Current Status, Challenges, and Guidelines.

Renato Zenobi1, Naresh Kumar1, Prabhat Verma2

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Tip-enhanced Raman spectroscopy (TERS) offers nanoscale light-matter interaction insights. This review clarifies inconsistent spatial resolution reporting in TERS, proposing standardized methods for accurate measurements.

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Nanospectroscopynanodriftnanoimagingoptical nanoconfinementplasmonic enhancement

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Area of Science:

  • Nanophotonics
  • Spectroscopy
  • Materials Science

Background:

  • Tip-enhanced Raman spectroscopy (TERS) is a powerful nano-optical technique for nanoscale light-matter interaction studies.
  • Established nearly 25 years ago, TERS provides unparalleled spatial resolution for probing materials at the nanoscale.

Purpose of the Study:

  • To address the controversy and inconsistency in reporting spatial resolution in TERS measurements.
  • To highlight the impact of various experimental conditions on TERS spatial resolution.
  • To propose standardized guidelines for determining and reporting TERS spatial resolution.

Main Methods:

  • Review of existing literature on TERS spatial resolution reporting.
  • Analysis of factors influencing spatial resolution in TERS, including experimental conditions.
  • Development of a comprehensive framework for assessing TERS spatial resolution.

Main Results:

  • Spatial resolution reporting in TERS is inconsistent and lacks a standardized methodology.
  • Numerous experimental factors significantly influence TERS spatial resolution, often overlooked in studies.
  • Current reporting methods yield varying spatial resolution values, complicating comparisons.

Conclusions:

  • A standardized approach to defining and reporting TERS spatial resolution is crucial for the field.
  • Understanding and controlling experimental parameters are essential for achieving optimal spatial resolution in TERS.
  • This review provides essential guidelines for accurate and consistent spatial resolution determination in TERS research.