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Related Experiment Video

Updated: Apr 5, 2026

Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Optimizing Electromagnetic Hotspots in Plasmonic Bowtie Nanoantennae.

Stephanie Dodson1, Mohamed Haggui2, Renaud Bachelot2

  • 1†Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.

The Journal of Physical Chemistry Letters
|August 19, 2015
PubMed
Summary

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Researchers optimized bowtie nanoantennae for enhanced biosensor sensitivity. Geometric factors, especially corner curvature, significantly impact surface-enhanced Raman scattering (SERS) and localized surface plasmon resonance (LSPR) capabilities, guiding future sensor design.

Area of Science:

  • Nanotechnology
  • Biosensing
  • Plasmonics

Background:

  • Biosensor sensitivity is crucial for improved detection capabilities.
  • Bowtie nanoantennae offer high sensitivity for surface-enhanced Raman scattering (SERS) and localized surface plasmon resonance (LSPR) biosensing.

Purpose of the Study:

  • To investigate the impact of varying bowtie nanoantennae geometries on optical and electromagnetic properties.
  • To optimize bowtie nanoantennae design for enhanced SERS and LSPR biosensing performance.

Main Methods:

  • Simulation and fabrication of optical bowtie nanoantennae with sub-5 nm gaps.
  • Characterization of geometric parameters: gap size, prism size, and corner radius of curvature.
  • Analysis using LSPR, SERS, and photochemical near-field imaging.
Keywords:
discrete dipole approximation (DDA)localized surface plasmon resonance (LSPR)optical nanoantennaplasmonicssurface-enhanced raman spectroscopy (SERS)

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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Main Results:

  • Successful fabrication of nanoantennae with sub-5 nm gaps.
  • Demonstrated significant influence of the radius of curvature on SERS performance.
  • Identified key geometric trends affecting optical and electromagnetic properties.

Conclusions:

  • The radius of curvature of prism corners is a critical factor for SERS abilities in nanoparticle arrays.
  • Design principles derived can lead to the development of highly sensitive SERS and LSPR biosensing substrates.