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Simulation methods for multiperiodic and aperiodic nanostructured dielectric waveguides.

Moritz Paulsen1, Lars Thorben Neustock1,2, Sabrina Jahns1

  • 11Institute of Electrical Engineering and Information Technology, Kiel University, Kaiserstr. 2, 24143 Kiel, Germany.

Optical and Quantum Electronics
|March 28, 2020
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Summary
This summary is machine-generated.

Researchers compared experimental and simulation results for nanostructured dielectric waveguides used in biosensing and solar cells. All three simulation methods (FEM, FDTD, RCWA) accurately predicted waveguide properties, with minor discrepancies for complex aperiodic structures.

Keywords:
Deterministic aperiodic nanostructuresWaveguide gratingsWaveoptic simulations

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Area of Science:

  • * Photonics and Nanotechnology
  • * Materials Science and Engineering

Background:

  • * Nanostructured dielectric waveguides offer tunable spectral and near-field properties for advanced applications.
  • * Multiperiodic and aperiodic nanostructures provide precise control over optical characteristics.
  • * Accurate simulation methods are crucial for designing and optimizing these nanostructures.

Purpose of the Study:

  • * To compare experimental data with simulation results for multiperiodic and aperiodic nanostructured dielectric waveguides.
  • * To evaluate the suitability of three distinct simulation techniques: Finite-Element Method (FEM), Finite-Difference Time-Domain (FDTD), and Rigorous Coupled Wave Algorithm (RCWA).
  • * To assess the accuracy of simulations in predicting near-field, far-field, and transmission properties.

Main Methods:

  • * Fabrication and characterization of multiperiodic (two and three compound periods) and aperiodic (Rudin-Shapiro, Fibonacci, Thue-Morse sequences) nanostructured dielectric waveguides.
  • * Computational analysis using FEM, FDTD, and RCWA to determine near-field and far-field properties.
  • * Comparison of simulation outputs with experimental measurements of transmission spectra and optical characteristics.

Main Results:

  • * All three simulation methods (FEM, FDTD, RCWA) demonstrated suitability for analyzing the fabricated nanostructures.
  • * Minor computational differences were observed in near-field and transmission characteristics across the methods.
  • * Simulations accurately predicted the general transmission spectra of multiperiodic structures, including transmission dips.
  • * Agreement between simulations and experimental results decreased for aperiodic nanostructures, attributed to fabrication imperfections at smaller feature sizes.

Conclusions:

  • * FEM, FDTD, and RCWA are reliable tools for simulating nanostructured dielectric waveguides.
  • * Simulation accuracy is high for multiperiodic structures but can be limited by fabrication precision for complex aperiodic designs.
  • * The study provides valuable insights into the performance and simulation of advanced nanophotonic devices for various applications.