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Nano Lett. 2018 Jun 13;18(6):3414-3420. doi: 10.1021/acs.nanolett.8b00334. Epub 2018 May 24.

Vertically Emitting Indium Phosphide Nanowire Lasers.

Author information

1
Department of Electronic Materials Engineering, Research School of Physics and Engineering , The Australian National University , Canberra , Australian Capital Territory 2601 , Australia.
2
School of Electronic Science and Engineering , Nanjing University , Nanjing 210093 , China.
3
Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210093 , China.
4
Institute of Photonics, SUPA Department of Physics , University of Strathclyde, Technology and Innovation Centre , 99 George Street , G1 1RD Glasgow , United Kingdom.
5
Institute for Biomedical Materials and Devices (IBMD), Faculty of Science , University of Technology Sydney , Sydney , New South Wales 2007 , Australia.

Abstract

Semiconductor nanowire (NW) lasers have attracted considerable research effort given their excellent promise for nanoscale photonic sources. However, NW lasers currently exhibit poor directionality and high threshold gain, issues critically limiting their prospects for on-chip light sources with extremely reduced footprint and efficient power consumption. Here, we propose a new design and experimentally demonstrate a vertically emitting indium phosphide (InP) NW laser structure showing high emission directionality and reduced energy requirements for operation. The structure of the laser combines an InP NW integrated in a cat's eye (CE) antenna. Thanks to the antenna guidance with broken asymmetry, strong focusing ability, and high Q-factor, the designed InP CE-NW lasers exhibit a higher degree of polarization, narrower emission angle, enhanced internal quantum efficiency, and reduced lasing threshold. Hence, this NW laser-antenna system provides a very promising approach toward the achievement of high-performance nanoscale lasers, with excellent prospects for use as highly localized light sources in present and future integrated nanophotonics systems for applications in advanced sensing, high-resolution imaging, and quantum communications.

KEYWORDS:

Nanowire lasers; photonic integration; plasmonic antennas; vertical emission

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