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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates

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Published on: March 20, 2015

Plasmonic band gap structures for surface-enhanced Raman scattering.

Askin Kocabas¹, Gulay Ertas, S S Senlik

¹Department of Physics, Bilkent University, 06800 Ankara, Turkey.

|August 20, 2008

Summary

Biharmonic metallic gratings enable highly reproducible surface-enhanced Raman scattering (SERS) with enhancement factors over 10^5. This technique utilizes localized surface plasmons for tunable SERS activity and directional photoluminescence enhancement.

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Area of Science:

Plasmonics
Nanophotonics
Spectroscopy

Background:

Surface-enhanced Raman Scattering (SERS) offers high sensitivity for molecular detection.
Metallic nanostructures are crucial for generating plasmonic effects that enhance Raman signals.
Biharmonic gratings combine coupling and band gap functionalities for tailored plasmonic responses.

Purpose of the Study:

To investigate SERS of rhodamine 6G (R6G) on novel biharmonic metallic gratings.
To explore the role of localized surface plasmons at band edges in signal enhancement.
To demonstrate tunable SERS activity and directional photoluminescence enhancement.

Main Methods:

Fabrication of biharmonic SERS templates using soft nano-imprint lithography.
Adsorption of rhodamine 6G molecules onto the fabricated grating structures.
Characterization of SERS and photoluminescence enhancement factors under varying plasmonic resonance conditions.

Main Results:

Achieved reproducible SERS enhancement factors exceeding 10^5.
Demonstrated tunable SERS activity by controlling plasmonic resonance.
Observed directional photoluminescence enhancement by a factor of 30 at plasmonic absorption peaks.

Conclusions:

Biharmonic metallic gratings are effective platforms for achieving significant and reproducible SERS enhancement.
The localized surface plasmons at band edges play a key role in the observed signal amplification.
The developed SERS templates offer potential for sensitive and directional optical sensing applications.