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Ultrasmooth metallic films with buried nanostructures for backside reflection-mode plasmonic biosensing.

Nathan C Lindquist¹, Timothy W Johnson, Jincy Jose

¹Laboratory of Nanostructures and Biosensing, Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455 USA.

Annalen Der Physik

|October 26, 2013

Summary

We developed a novel plasmonic device with buried nanostructures on ultrasmooth surfaces for advanced biosensing. This architecture enables sensitive detection of opaque liquids using backside reflection-mode imaging.

Keywords:

Atomically Flat Gold Film Biosensing Grating Couplers Nanolithography Nanostructures Plasmonics Surface Plasmon Resonance (SPR)Template Stripping

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Area of Science:

Nanophotonics
Plasmonics
Biosensing

Background:

Traditional surface plasmon resonance (SPR) sensors face limitations with opaque or scattering samples.
Achieving ultrasmooth surfaces is crucial for high-performance plasmonic devices.

Purpose of the Study:

To introduce a new plasmonic device architecture featuring buried nanostructures.
To demonstrate its utility for biosensing applications, particularly with challenging liquid samples.

Main Methods:

Utilizing template-stripping techniques to create ultrathin gold films (<5 Å roughness).
Optically coupling these films to buried metallic gratings, rings, or nanodots.
Implementing a backside, reflection-mode geometry for decoupled optical and fluidic access.

Main Results:

Demonstrated a prototypical device with buried linear plasmonic gratings for biosensing.
Achieved high sensitivity and decoupled optical access, similar to prism-based SPR.
Enabled sensing with opaque and highly scattering liquids.
Showcased benefits of nanoplasmonics like spectral tunability and wide-field imaging.

Conclusions:

The new architecture offers a versatile platform for biosensing with enhanced capabilities.
The design is suitable for various applications including nanophotonic waveguides and spectroscopy.
Ultrasmooth surfaces with buried nanostructures represent a significant advancement in plasmonic device design.