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Tunable elastomer-based virtually imaged phased array.

Philipp Metz1, Hendrik Block, Christopher Behnke

  • 1Institute of Electrical and Information Engineering, Christian-Albrechts-Universität zu Kiel, 24143 Kiel, Germany. pm@tf.uni-kiel.de

Optics Express
|March 14, 2013
PubMed
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We developed a tunable elastomer-based virtually imaged phased array (VIPA) for precise dispersion control. This device utilizes thermal expansion and the thermo-optic effect in polydimethylsiloxane (PDMS) for tuning.

Area of Science:

  • Photonics and Optical Engineering
  • Materials Science for Optoelectronics
  • Nanophotonics and Metamaterials

Background:

  • Virtually imaged phased arrays (VIPAs) offer advantages over conventional gratings for wafer-level integration.
  • Existing VIPA designs lack efficient tunability for dispersion characteristics.
  • Elastomeric materials present opportunities for tunable optical devices.

Purpose of the Study:

  • To introduce an elastomer-based tunable VIPA for fine-tuning dispersion.
  • To enable precise control over optical device performance through tunability.
  • To explore thermal tuning mechanisms in VIPA structures.

Main Methods:

  • Fabrication of a VIPA using a polydimethylsiloxane (PDMS) elastomer layer.
  • Integration of silver coatings for reflective and semi-transparent mirrors.

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  • Utilizing Joule heating of the top silver electrode for thermal tuning via expansion and thermo-optic effects.

    • Main Results:

    • Demonstrated a tunable VIPA with a 7.2K temperature increase achieving a tuning span of one free angular range (FAR).
    • Introduced the free angular range (FAR) as a new VIPA performance metric.
    • Analyzed resonance quality and tunability through numerical simulations and experimental validation.

    Conclusions:

    • The elastomer-based tunable VIPA offers a viable method for precise dispersion control.
    • Thermal tuning via Joule heating provides effective and efficient adjustment of VIPA characteristics.
    • The developed VIPA shows promise for advanced integrated photonic applications.