Low Threshold Lasing from Ultra-Compact InP Nanowire PCSEL Arrays

ORAL

Abstract

Indium phosphide (InP) nanowire photonic crystal (PhC) arrays have previously been investigated for their potential in achieving single mode lasing. In this work, we explore the optically pumped lasing characteristics of ultra-compact InP nanowire (NW) photonic crystal surface emitting lasers (PCSELs) aimimg to reduce the device footprint while maintaining low thresholds. These PhCs feature hexagonally shaped photonic crystal arrays of varying sizes with side lengths ranging from 15 to 1.5 μm. Under pulsed excitation, the lowest threshold fluences were observed to be achieved by the 5 and 10 μm side length PhC arrays, with values 3.3 and 25 μJ/cm2 at 77 K and room temperature, respectively. At 77 K, the threshold fluence for 5 μm side length array is nearly 2 times lower than that of a large area PCSEL. The lower lasing thresholds observed in the small area PCSELs are attributed to an enhanced nanowire homogeneity and increased optical feedback resulting from the back reflection at the photonic crystal-air interface.

*Support from the NSF (grants DMR-2004768 & ECCS-2422077), the John Hauck Foundation at Xavier University, the Australian Research Council (ARC) & the Australian National Fabrication Facility, ACT Node, are gratefully acknowledged.

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Presenters

  • Navoda Jayawardana

    • University of Cincinnati

Authors

  • Navoda Jayawardana

    • University of Cincinnati

  • Matthew T Larson

    • University of Cincinnati

  • Chia-Wei Tu

    • University of Cincinnati

  • Wei W Wong

    • The Australian National University
    • Australian Natl University

  • Hark Hoe Tan

    • The Australian National University
    • Australian Natl University

  • Chennupati Jagadish

    • Australian Natl University

  • Heidrun Schmitzer

    • Xavier University

  • Hans-Peter Wagner

    • University of Cincinnati