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Plasmonic Vertically Coupled Complementary Antennas for Dual-Mode Infrared Molecule Sensing.

Xiahui Chen1, Chu Wang1, Yu Yao1

  • 1School of Electrical, Computer and Energy Engineering, ‡The Center for Photonics Innovation, and §Biodesign Center for Molecular Design & Biomimetics, Arizona State University , Tempe, Arizona 85287, United States.

ACS Nano
|July 12, 2017
PubMed
Summary

We developed a novel infrared plasmonic nanosensor using vertically coupled complementary antennas (VCCAs) for sensitive, label-free molecule detection. This dual-mode sensor achieves high sensitivity and specificity for nanometer-sized molecules.

Keywords:
molecular fingerprintnear-field enhancementplasmonic nanoantennasrefractometric sensingself-assembled gold nanoparticlessurface-enhanced infrared absorptionvibrational spectroscopy

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Area of Science:

  • Plasmonics
  • Nanotechnology
  • Infrared Spectroscopy
  • Biosensing

Background:

  • Label-free detection of nanometer-sized molecules is crucial for various applications.
  • Existing nanosensors often lack sensitivity, specificity, or quantitative capabilities.
  • Infrared plasmonic sensors offer potential for high-performance molecular detection.

Purpose of the Study:

  • To report a novel infrared plasmonic nanosensor for label-free, sensitive, specific, and quantitative identification of nanometer-sized molecules.
  • To demonstrate the dual-mode sensing capabilities and high sensitivity of the VCCA design.
  • To investigate the impact of nanoparticle morphology on nanosensor performance.

Main Methods:

  • Design and fabrication of vertically coupled complementary antennas (VCCAs) with densely patterned hot-spots.
  • Experimental demonstration of dual-mode sensing (parallel and perpendicular polarization) for octadecanethiol (ODT) monolayer detection.
  • Development of a mathematical algorithm for designing and simulating gold nanoparticles on VCCA sensors.

Main Results:

  • A significant antenna resonance wavelength shift of over 136 nm was observed for a 2.5 nm ODT monolayer in parallel mode.
  • All four characteristic vibrational fingerprint signals of ODT were clearly delineated in both sensing modes.
  • Simulated gold nanoparticles enhanced near-field intensity by 10^3 to 10^4 times, improving ODT sensing performance.

Conclusions:

  • The VCCA nanosensor exhibits high sensitivity, specificity, and dual-mode operation for nanometer-sized molecule detection.
  • The sensor design offers flexibility for broad applications, including biomarker detection and environmental monitoring.
  • The developed mathematical algorithm aids in optimizing nanoparticle morphology for enhanced sensor performance.