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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
11:08

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Published on: November 30, 2012

Sharp edge wavelength filters utilizing multilayer photonic crystals.

Yasuo Ohtera1, Yoshihiko Inoue, Takayuki Kawashima

  • 1Graduate School of Engineering, Tohoku University, Sendai, Miyagi, 980-8579 Japan. ohtera@ecei.tohoku.ac.jp

Optics Express
|April 15, 2009
PubMed
Summary

Researchers developed new dielectric multilayer filters with sharp cut-offs. Perturbations create deep optical stopbands, improving performance over traditional flat designs for enhanced light wave filtering.

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Area of Science:

  • Photonics and Optical Engineering
  • Materials Science

Background:

  • Dielectric multilayer filters are crucial for optical applications requiring precise wavelength selection.
  • Achieving sharp cut-off characteristics and deep stopbands in these filters presents a significant challenge.

Purpose of the Study:

  • To propose and investigate a novel configuration of dielectric multilayer wavelength filters.
  • To enhance the cut-off characteristics and optical stopband performance of multilayer filters.

Main Methods:

  • Introducing structural perturbations, such as corrugation or lateral film isolation, to the dielectric multilayer.
  • Utilizing Finite-Difference Time-Domain (FDTD) numerical simulations to analyze the optical properties.

Main Results:

  • The proposed perturbed structures enable the creation of deep optical stopbands.
  • A significant coupling between obliquely and horizontally propagating light waves is achieved.
  • The perturbed structures exhibit decay constants two to three times larger than unmodulated flat multilayers.

Conclusions:

  • The novel perturbed dielectric multilayer configuration effectively enhances filter performance.
  • This design offers a promising approach for achieving sharper cut-offs and deeper stopbands in optical filters.