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Proton-exchanged periodically segmented waveguides in LiNbo(3).

K Thyagarajan, C W Chien, R V Ramaswamy

    Optics Letters
    |October 22, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers characterized proton-exchanged periodically segmented waveguides in lithium niobate. The study reveals how segmentation parameters influence waveguide properties, aiding future device design.

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    Area of Science:

    • Photonics and Waveguide Technology
    • Materials Science in Optics
    • Lithium Niobate Devices

    Background:

    • Proton-exchanged waveguides in lithium niobate are crucial for integrated optics.
    • Periodically segmented waveguides offer unique optical properties.
    • Understanding the influence of fabrication parameters is key for device optimization.

    Purpose of the Study:

    • To characterize single-mode and multimode proton-exchanged periodically segmented waveguides in lithium niobate.
    • To investigate the impact of annealing time, duty cycle, and segmentation period on effective indices.
    • To model the behavior of these segmented waveguides.

    Main Methods:

    • Fabrication of proton-exchanged periodically segmented waveguides in lithium niobate.
    • Characterization of effective indices for various modes.
    • Analysis of waveguide properties as a function of segmentation parameters (duty cycle, period) and annealing time.
    • Development of an equivalent waveguide model.

    Main Results:

    • Effective indices vary with annealing time, duty cycle, and segmentation period.
    • Proton-exchanged periodically segmented waveguides can be modeled as equivalent z-invariant, depth-independent graded-index waveguides with a Gaussian index distribution.
    • Waveguide depth is independent of duty cycle.
    • Peak refractive-index change increases linearly with duty cycle and saturates at higher values.

    Conclusions:

    • The characterization provides valuable insights into the optical properties of proton-exchanged periodically segmented waveguides.
    • The developed equivalent waveguide model simplifies the understanding and design of these structures.
    • The findings will aid in the design of advanced linear and nonlinear optical devices utilizing segmented waveguides.