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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Updated: Feb 3, 2026

Fabrication of Nanopillar-Based Split Ring Resonators for Displacement Current Mediated Resonances in Terahertz Metamaterials
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All-Dielectric Surface-Enhanced Infrared Absorption-Based Gas Sensor Using Guided Resonance.

Yuhua Chang1,2, Dihan Hasan1,2, Bowei Dong1,2

  • 1Department of Electrical and Computer Engineering , National University of Singapore , 117583 , Singapore.

ACS Applied Materials & Interfaces
|October 27, 2018
PubMed
Summary

This study introduces an all-dielectric photonic crystal slab for surface-enhanced infrared absorption (SEIRA) sensing. This novel dielectric platform achieves a 20 ppm detection limit for carbon dioxide (CO2) sensing with low loss.

Keywords:
all-dielectricgas enrichment polymergas sensorguided resonancephotonic crystal slabsurface enhanced infrared absorption

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Area of Science:

  • Photonics
  • Spectroscopy
  • Materials Science

Background:

  • Surface-enhanced infrared absorption (SEIRA) traditionally uses metallic resonators, facing limitations like dissipative loss and heating.
  • Dielectric platforms are emerging as a promising, low-loss alternative for SEIRA applications.

Purpose of the Study:

  • To investigate an all-dielectric photonic crystal slab as a platform for SEIRA.
  • To explore guided resonance for enhanced sensitivity in SEIRA gas sensing.
  • To assess the feasibility of low-loss dielectric structures in transmission mode SEIRA.

Main Methods:

  • Fabrication of a guided resonance-based all-dielectric photonic crystal slab.
  • Integration with gas enrichment polymer coating for enhanced CO2 capture.
  • Utilizing transmission mode for SEIRA measurements.

Main Results:

  • Demonstrated guided resonance-induced enhancement in effective path length and electric field.
  • Achieved a detection limit of 20 ppm for carbon dioxide (CO2) sensing.
  • Validated the low-loss characteristics of the all-dielectric platform.

Conclusions:

  • All-dielectric photonic crystal slabs are effective platforms for SEIRA sensing.
  • Guided resonance significantly enhances SEIRA sensitivity.
  • This approach offers a low-loss alternative to traditional metallic SEIRA sensors.