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Slow-light-enhanced codirectional couplers with negative index materials.

L Zhao1, Wenhui Duan

  • 1Department of Physics, Tsinghua University, Beijing 100084, China. zhaol@phys.tsinghua.edu.cn

Optics Express
|June 7, 2011
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Summary
This summary is machine-generated.

Optical coupling structures with negative index materials (NIMs) enhance light coupling. Slow-light effects in NIM waveguides are key to this enhancement, guiding the design of advanced photonic devices.

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Area of Science:

  • Photonics and optical engineering
  • Materials science
  • Waveguide theory

Background:

  • Optical codirectional coupling structures are fundamental components in integrated photonics.
  • Negative index materials (NIMs) offer unique optical properties not found in conventional materials.
  • Understanding light propagation and coupling in complex waveguide structures is crucial for device miniaturization.

Purpose of the Study:

  • To systematically investigate optical codirectional coupling in structures with negative index materials (NIMs).
  • To analyze the role of the slow-light effect in enhancing coupling strength.
  • To provide design guidelines for optimizing NIM-based codirectional couplers.

Main Methods:

  • Coupled-mode theory applied to parallel planar waveguides.
  • Analysis of structures with NIMs and positive-index materials.
  • Analytical derivations and numerical simulations.

Main Results:

  • Enhanced coupling strength between copropagating optical modes in NIM structures.
  • Demonstration that the slow-light effect in NIM waveguides is essential for coupling enhancement.
  • Identification of specific configurations (e.g., positive-index cores in NIM claddings) yielding the strongest enhancement due to slowest light.

Conclusions:

  • The slow-light effect in NIM waveguides significantly enhances optical codirectional coupling.
  • Specific waveguide configurations can maximize this enhancement, leading to compact photonic devices.
  • The findings offer a fundamental understanding and practical guidelines for designing advanced codirectional couplers for classical and quantum information processing.