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Enhanced total internal reflection using low-index nanolattice materials.

Xu A Zhang, Yi-An Chen, Abhijeet Bagal

    Optics Letters
    |October 14, 2017
    PubMed
    Summary
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    Researchers integrated robust nanolattice materials to enhance total internal reflection (TIR) in integrated photonics. This breakthrough enables stronger light trapping and paves the way for advanced optical devices.

    Area of Science:

    • Photonics
    • Materials Science
    • Optics

    Background:

    • Low-index materials are crucial for integrated photonics, improving index contrast and device performance.
    • Porous materials, often used for low-index applications, suffer from poor mechanical strength and integration challenges.
    • Robust nanolattice materials offer a potential solution for creating stable low-index components.

    Purpose of the Study:

    • To demonstrate enhanced total internal reflection (TIR) using robust nanolattice materials integrated between high-index media.
    • To investigate the light-trapping capabilities of these nanolattice structures.
    • To establish nanolattice materials as viable, mechanically strong alternatives for low-index applications in photonics.

    Main Methods:

    • Fabrication of multilayer stacks incorporating nanolattice materials.

    Related Experiment Videos

  • Transmission measurements to determine light trapping effects and cutoff angles.
  • Rigorous coupled-wave analysis (RCWA) and transfer matrix method (TMM) simulations for light propagation analysis.

    • Main Results:

    • Experimental observation of enhanced total internal reflection (TIR) with a cutoff angle around 60 degrees.
    • Simulations using RCWA and TMM showed good agreement with experimental transmission data.
    • Demonstrated effective light trapping within the nanolattice structures.

    Conclusions:

    • Nanolattice materials can be effectively integrated to induce enhanced TIR, overcoming limitations of traditional porous low-index materials.
    • This work represents a significant step towards developing robust multilayer photonic devices.
    • Nanolattice materials show promise for applications in integrated photonics, antireflection coatings, photonic crystals, and low-k dielectrics.