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Preferential-order waveguide grating couplers: a comparative rigorous analysis using the finite-difference

Aristeides D Papadopoulos1, Elias N Glytsis

  • 1School of Electrical and Computer Engineering National Technical University of Athens, Athens, Greece 15773. arpapad@mail.ntua.gr

Applied Optics
|October 22, 2010
PubMed
Summary
This summary is machine-generated.

This study compares four preferential-order grating couplers for waveguide applications using rigorous analysis. Results highlight their outcoupling efficiencies and branching ratios for optimal device design.

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Area of Science:

  • Optics and Photonics
  • Integrated Photonics
  • Waveguide Technology

Background:

  • Preferential-order grating couplers are crucial components in integrated photonic devices.
  • Efficiently directing light within waveguides is essential for optical communication and sensing.

Purpose of the Study:

  • To rigorously analyze and compare four types of preferential-order waveguide grating output couplers.
  • To evaluate their performance based on outcoupling efficiency, branching ratios, design parameters, and excitation wavelength.

Main Methods:

  • Finite-difference time-domain (FDTD) method in total-field/scattered-field formulation.
  • Analysis of TE and TM polarizations for four grating coupler types: volume holographic, slanted parallelogrammic surface-relief, double-corrugated surface-relief, and reflecting-stack surface-relief.
  • Comparison with rigorous coupled-wave analysis (RCWA) leaky-mode method.

Main Results:

  • Calculated outcoupling efficiencies and branching ratios for each coupler type.
  • Demonstrated preferentiality of the analyzed grating couplers.
  • Performance evaluation across different design parameters and excitation wavelengths.

Conclusions:

  • The study provides a rigorous comparison of different preferential-order grating couplers.
  • Findings aid in selecting optimal couplers for specific integrated photonic applications.
  • Detailed performance data facilitates future device design and optimization.