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Related Experiment Videos

Volume grating couplers: polarization and loss effects.

Ricardo A Villalaz1, Elias N Glytsis, Thomas K Gaylord

  • 1School of Electrical and Computer Engineering, Microelectronics Research Center and Packaging Research Center, Georgia Institute of Technology, Atlanta 30332-0250, USA.

Applied Optics
|September 5, 2002
PubMed
Summary

This study analyzes volume grating couplers, detailing how polarization and material loss affect their performance. Optimized designs achieve polarization-dependent or independent coupling with minimal loss impact.

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Area of Science:

  • Photonics and Optical Engineering
  • Integrated Optics
  • Waveguide Devices

Background:

  • Volume grating couplers are key components in integrated optics for efficient light coupling.
  • Understanding polarization-dependent performance and material loss is crucial for device optimization.

Purpose of the Study:

  • To analyze the polarization-dependent and loss performance of volume grating couplers.
  • To present designs for both polarization-dependent and polarization-independent volume grating couplers.
  • To evaluate the impact of material loss on coupler efficiency.

Main Methods:

  • Utilized a leaky-mode approach combined with rigorous coupled-wave analysis (RCWA).
  • Investigated two configurations: volume grating in the cover layer and in the waveguide.

Related Experiment Videos

  • Studied the angular dependence of TE and TM polarization coupling efficiency.

    • Main Results:

    • Polarization-dependent couplers achieved with outcoupling near normal incidence.
    • Polarization-independent couplers designed for outcoupling angles away from normal (46.7° and 54.4°).
    • Material loss (5 dB/cm) showed minimal impact (<3% reduction in coupling efficiency).

    Conclusions:

    • Volume grating couplers can be designed for specific polarization behaviors.
    • Material loss has a limited effect on coupler performance in practical scenarios.
    • The findings provide guidelines for designing efficient and robust grating couplers.