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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Multispectral thin film biosensing and quantitative imaging using 3D plasmonic crystals.

Matthew E Stewart¹, Jimin Yao, Joana Maria

¹Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Analytical Chemistry

|July 14, 2009

Summary

This study introduces plasmonic crystal biosensors for precise imaging and immunoassays. These sensors quantify molecular binding events with high sensitivity, enabling accurate detection of biological interactions.

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Published on: September 27, 2011

Area of Science:

Plasmonics
Biosensing
Nanotechnology

Background:

Plasmonic crystals offer unique optical properties for sensing applications.
Quantitative biosensing requires sensitive and reliable detection platforms.
Multispectral analysis enhances specificity and accuracy in immunoassays.

Purpose of the Study:

To establish and validate plasmonic crystal platforms for quantitative imaging biosensing and multispectral immunoassays.
To investigate the refractive index sensitivity of 3D plasmonic crystals to thin films.
To optimize plasmonic crystal design for enhanced thin-film sensitivity.

Main Methods:

Layer-by-layer (LbL) assembly of polyelectrolytes for thin film formation and sensor optimization.
Full 3D finite-difference time-domain (FDTD) calculations for modeling optical responses.
Multispectral analysis of plasmonic crystal response to varying film thicknesses.
Antibody/antigen binding assays to demonstrate quantitative biosensing capabilities.

Main Results:

Plasmonic crystals exhibit distance-dependent refractive index sensitivity to thin films.
Optimized crystal designs and gold thickness improve thin-film sensitivity.
Integrated multispectral response correlates linearly with film thickness (<70 nm).
Quantitative detection of antibody/antigen binding with a binding constant of ~10(7) M(-1) and detection limit of ~400 pM.

Conclusions:

Plasmonic crystal platforms are validated for quantitative imaging biosensing and multispectral immunoassays.
The developed sensors enable precise calibration and detection of surface binding events.
These findings advance the development of high-performance biosensing technologies.