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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates

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Waveguide Enhanced Raman Spectroscopy for Biosensing: A Review.

Mohamed A Ettabib¹, Almudena Marti², Zhen Liu¹

¹Zepler Institute for Photonics and Nanoelectronics, University of Southampton, Southampton SO17 1BJ, United Kingdom.

|June 11, 2021

Summary

Waveguide enhanced Raman spectroscopy (WERS) offers a sensitive, metal-free alternative for biochemical analysis. Recent advancements enable portable, cost-effective WERS systems for diverse applications.

Keywords:

Raman sensor Raman spectroscopy SERS WERS biosensing integrated photonics photonic sensors surface functionalization waveguide

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Area of Science:

Spectroscopy
Biochemistry
Materials Science

Background:

Surface-enhanced Raman spectroscopy (SERS) faces limitations due to reliance on fragile noble metal nanostructures.
Waveguide enhanced Raman spectroscopy (WERS) leverages dielectric waveguides to generate strong evanescent fields for analyte interaction.
Advancements in lasers, spectrometers, and nanofabrication pave the way for portable WERS systems.

Purpose of the Study:

To review the latest progress in Waveguide enhanced Raman spectroscopy (WERS) technology.
To summarize recent demonstrations and applications of WERS.
To provide a future roadmap for WERS development.

Main Methods:

Introduction to the fundamentals and theoretical framework of WERS.
Discussion of WERS design considerations.
Review of waveguide surface modification techniques for biorecognition element attachment.

Main Results:

WERS provides a robust, metal-free platform for direct identification and quantification of biochemical species.
Recent WERS implementations demonstrate high sensitivity and reproducibility.
The technology is becoming increasingly portable and cost-effective.

Conclusions:

WERS presents a viable and advantageous alternative to SERS for biochemical analysis.
Key opportunities lie in further material engineering and system integration.
Challenges include optimizing surface functionalization and enhancing system robustness.