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Related Concept Videos

Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Band Theory02:35

Band Theory

When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...

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Related Experiment Video

Updated: Jun 20, 2026

Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
10:35

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Published on: September 26, 2014

Grating based plasmonic band gap cavities.

S Seckin Senlik1, Askin Kocabas, Atilla Aydinli

  • 1Turk Telekom Laboratory, Department of Physics, Bilkent University, Ankara 06800, Turkey.

Optics Express
|September 3, 2009
PubMed
Summary
This summary is machine-generated.

This study compares grating-based plasmonic band gap cavities. Moiré surfaces offer higher quality factors by suppressing radiation loss, outperforming uniform and biharmonic designs.

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Area of Science:

  • Photonics and Nanotechnology
  • Plasmonics
  • Optical Cavities

Background:

  • Plasmonic band gap cavities are crucial for controlling light at the nanoscale.
  • Grating-based designs offer tunable optical properties.
  • Understanding quality factor limitations is key for device performance.

Purpose of the Study:

  • To comparatively analyze the quality factors of grating-based plasmonic band gap cavities.
  • To investigate the impact of different grating surface types (uniform, biharmonic, Moiré) on cavity performance.
  • To experimentally validate the performance of plasmonic cavities.

Main Methods:

  • Numerical calculation of quality factors for uniform, biharmonic, and Moiré grating surfaces.
  • Investigating radiation loss suppression in biharmonic cavities.
  • Experimental fabrication and characterization of uniform grating-based plasmonic cavities.
  • Utilizing dielectric loading for effective index perturbation and geometry control.

Main Results:

  • Moiré type surfaces support higher quality factor cavity modes due to gradual surface profile changes.
  • Radiation loss in biharmonic band gap cavities can be suppressed by modifying grating components.
  • Experimentally demonstrated plasmonic cavities based on uniform gratings.
  • Achieved a quality factor of 85 from measured band structure in experimental cavities.

Conclusions:

  • Moiré grating surfaces represent a promising approach for enhancing plasmonic cavity quality factors.
  • Optimizing grating profiles is essential for minimizing losses and maximizing performance in plasmonic devices.
  • Experimental validation confirms the potential of these cavities for photonic applications.