Reflection properties of uncoated and gold-coated InP photonic crystals

POSTER

Abstract

We investigated the spectral and angle resolved reflectance of uncoated and gold coated InP nanowire (NW) arrays which were grown by selective area epitaxy. The NW arrays were coated with a 12-nm thick Al2O3 film to suppress atmospheric oxidation. An additional 10-nm thick gold film was further deposited around the NWs to investigate plasmonic effects. The arrays reveal pronounced Fabry-Perot oscillations due to their strong intrinsic birefringence, shifted for p- and s-polarized light. Gold-coating of the NW array increases the reflectance by a factor of two to three compared to the uncoated array. This increase is attributed to a plasmon resonance of the gold caps on top of the NWs and to a plasmonic antenna effect for p-polarized light. Both interpretations are supported by finite-difference time-domain simulations. The reflectance of light is highly polarization-dependent, making InP NW PhC arrays ideal micrometer-sized optical elements like polarizers, analyzers, and mirrors with potential applications in photonic integrated circuits.

*The Australian Research Council (ARC) is acknowledged for its financial support. The authors also acknowledge the use of the epitaxial facilities of the Australian National Fabrication Facility, ACT Node. Support from the National Science Foundation (NSF, grant DMR-2004768), the University Research Council (URC) at the University of Cincinnati, and John Hauck Foundation at Xavier University are gratefully acknowledged.

Presenters

  • Hans-Peter Wagner

    • Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA
    • University of Cincinnati, Ohio, US

Authors

  • Hans-Peter Wagner

    • Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA
    • University of Cincinnati, Ohio, US

  • Chia-Wei Tu

    • Department of Physics, University of Cincinnati, Cincinnati, OH 45221, USA

  • Masoud Kaveh

    • Department of Physics & Astronomy, James Madison University, Harrisonburg, VA 22807, USA

  • Martin Fränzl

    • Department of Physics, University of Leipzig, Leipzig, 04109, Germany
    • University of Leipzig, Germany

  • Qian Gao

    • Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia

  • Hark-Hoe Tan

    • Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia

  • Chennupati Jagadish

    • Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
    • ARC Center of Excellence for Transformative Meta-Optical Systems, The Australian National University, Australia.

  • Heidrun Schmitzer

    • Department of Physics, Xavier University, Cincinnati, OH 45207, USA
    • Xavier University, Cincinnati, US