Lasing from InP Nanowire Photonic Crystals on InP Substrate

Chia Wei Tu, Martin Fränzl, Qian Gao, Hark Hoe Tan, Chennupati Jagadish, Heidrun Schmitzer, Hans Peter Wagner*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    Abstract

    2D photonic crystal (PhC) lasing from an InP nanowire array still attached to the InP substrate is demonstrated for the first time. The undoped wurtzite InP nanowire array is grown by selective area epitaxy and coated with a 10 nm thick Al2O3 film to suppress atmospheric oxidation and band-bending effects. The PhC array displays optically pumped lasing at room temperature at a pulsed threshold fluence of 14 µJ cm−2. At liquid nitrogen temperature, the array shows lasing under continuous wave excitation at a threshold intensity of 500 W cm−2. The output power of the single mode laser line reaches values of 470 µW. Rate equation calculations indicate a quality factor of Q ≈ 1000. Investigations near threshold reveal that lasing starts from isolated islands within the pumped region before coherently merging into a single homogeneous area with increasing excitation power. This field emits a lasing mode with an average off-normal angle of ≈6°. Single mode lasing with the nanoarray still attached to the InP substrate opens new design opportunities for electrically pumped PhC laser light sources.

    Original languageEnglish
    Article number2001745
    JournalAdvanced Optical Materials
    Volume9
    Issue number3
    DOIs
    Publication statusPublished - 4 Feb 2021

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