Intrinsic polarization control in rectangular GaN nanowire lasers

Nanoscale
Changyi LiGeorge T Wang

Abstract

We demonstrate intrinsic, linearly polarized lasing from single GaN nanowires using cross-sectional shape control. A two-step top-down fabrication approach was employed to create straight nanowires with controllable rectangular cross-sections. A clear lasing threshold of 444 kW cm(-2) and a narrow spectral line width of 0.16 nm were observed under optical pumping at room temperature, indicating the onset of lasing. The polarization was along the short dimension (y-direction) of the nanowire due to the higher transverse confinement factors for y-polarized transverse modes resulting from the rectangular nanowire cross-section. The results show that cross-sectioned shape control can enable inherent control over the polarization of nanowire lasers without additional environment requirements, such as placement onto lossy substrates.

References

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Aug 20, 2008·Nature Materials·Fang QianCharles M Lieber
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Citations

Jun 1, 2017·Nature Communications·Juan S Totero GongoraAndrea Fratalocchi
Jan 21, 2017·Scientific Reports·Yonatan CalahorraDan Ritter
Mar 4, 2017·Materials Science & Engineering. C, Materials for Biological Applications·Neeta Bachheti ThapliyalSrinivasulu Cherukupalli
Jul 4, 2019·Nanoscale·So Yeon ChunJae Kyu Song
Jan 25, 2017·Nano Letters·Changyi LiGeorge T Wang
Aug 7, 2019·Chemical Reviews·Enrique BarrigónLars Samuelson

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