High-sensitivity Raman scattering substrate based on Au/La(0.7)Sr(0.3)MnO(3) periodic arrays

Area of Science:

• Materials Science
• Nanotechnology
• Spectroscopy

Background:

• Surface-enhanced Raman scattering (SERS) requires substrates with tunable optical properties.
• Lanthanum strontium manganite (LSMO) is a promising material for nanostructure fabrication.
• Electron beam lithography offers precise control over nanoscale patterns.

Purpose of the Study:

• To develop novel Au/LSMO periodic arrays with tunable surface plasmon properties.
• To investigate the control of surface plasmon behavior via electron beam dosage.
• To demonstrate the utility of these arrays as high-sensitivity SERS substrates.

Main Methods:

• Fabrication of Au/LSMO periodic arrays using electron beam lithography of LSMO resist.
• Tuning surface plasmon properties by controlling electron beam dosage.
• Characterization using scanning confocal microscopy and spectral microreflectometry.
• Application as SERS substrates for poly-3-hexylthiophene (P3HT) detection.

Main Results:

• Achieved tunable surface plasmon properties in Au/LSMO periodic arrays.
• Demonstrated control over plasmon behavior by varying electron beam dosage.
• Observed up to a four-order-of-magnitude enhancement in P3HT Raman scattering intensity.
• Confirmed the effectiveness of the Au/LSMO array as a high-sensitivity SERS substrate.

Conclusions:

• Au/LSMO periodic arrays offer a novel platform for tunable SERS substrates.
• Electron beam dosage provides a unique method for controlling plasmonic properties.
• These substrates significantly enhance Raman signal detection for molecular analysis.