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Pietro Strobbia1,2, Tyjair Sadler1,3, Ren A Odion1,2

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Polarization Modulation-Surface-Enhanced Raman Spectroscopy (PM-SERS) enhances weak signals by modulating plasmonics. This technique effectively extracts SERS signals from strong backgrounds, improving real-world applications.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nanotechnology

Background:

  • Surface-enhanced Raman spectroscopy (SERS) offers detailed molecular information but struggles with weak signals and background interference.
  • Existing plasmonic platforms enhance Raman signals but are insufficient for extracting weak signals from intense backgrounds.

Purpose of the Study:

  • To introduce a practical method, Polarization Modulation-SERS (PM-SERS), for extracting weak SERS signals from interfering backgrounds.
  • To leverage the polarization dependence of anisotropic SERS substrates for signal modulation.

Main Methods:

  • Developed PM-SERS by incorporating liquid crystal polarizers into a standard Raman setup to modulate excitation polarization.
  • Fabricated anisotropic SERS substrates using oblique angle evaporation (OAV).
  • Characterized substrate response to polarization-modulated laser excitation.

Main Results:

  • Demonstrated successful extraction of weak SERS signals from strong interfering backgrounds, including fluorescent samples and background light.
  • Showcased the capability of PM-SERS to operate at a quasi-real-time rate of 0.5 Hz.
  • Validated the effectiveness of PM-SERS in overcoming limitations of conventional SERS.

Conclusions:

  • PM-SERS provides a practical solution for enhancing SERS signal detection in challenging real-world scenarios.
  • The technique effectively modulates plasmonic effects using polarization control.
  • PM-SERS is expected to facilitate broader adoption of SERS applications.