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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Organic-based plasmonic emitters for sensing applications.

Nan-Fu Chiu1, Teng-Yi Huang, Chun-Chuan Kuo

  • 1Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei, Taiwan. nfchiu@ntnu.edu.tw

Applied Optics
|March 6, 2013
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Summary
This summary is machine-generated.

Researchers demonstrated plasmonic emissions from organic layers on metal gratings. This surface plasmon (SP) coupled method shows potential for sensitive, low-cost biosensors detecting refractive index changes, like glucose concentrations.

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Area of Science:

  • Plasmonics and Nanophotonics
  • Biosensing Technologies
  • Organic Electronics

Background:

  • Surface plasmon (SP) modes on organic/metal interfaces offer unique optical properties.
  • Metal grating structures can couple SP modes to free-space light emission.
  • Developing sensitive and cost-effective biosensing platforms remains a key challenge.

Purpose of the Study:

  • To demonstrate plasmonic emissions from an organic layer on a metal grating.
  • To investigate the use of SP-coupled emissions for refractive index sensing.
  • To explore potential applications in point-of-care biosensing.

Main Methods:

  • Excitation of an organic layer (Alq(3)/Au) on a metal grating structure.
  • Tuning the grating pitch to control the plasmonic bandgap and emission directionality.
  • Utilizing SP-coupled fluorophores to correlate emission wavelength/angle with refractive index changes.

Main Results:

  • Achieved highly directional plasmonic emissions with enhanced intensity.
  • Demonstrated a tunable plasmonic emitter wavelength (480-680 nm) with varying glucose concentrations (10-40%).
  • Quantified high sensitivity (Δθe/Δn=37.76°, Δn/Δ=1.681×10(-4) RIU) for a 500 nm pitch device.

Conclusions:

  • The proposed method effectively generates tunable plasmonic emissions via SP coupling.
  • The developed system shows significant potential for sensitive refractive index detection.
  • This approach is suitable for creating low-cost, disposable, point-of-care biosensors.