title: Intrinsic polarization control in rectangular GaN nanowire lasers.
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.
authors.affiliation: Center for High Technology Materials, University of New Mexico, 1313 Goddard St. SE, Albuquerque, NM 87106, USA.
authors.forename: Changyi
authors.initials: C
authors.lastname: Li
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gtwang@sandia.gov and Center for Integrated Nanotechnology, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
authors.forename: Sheng
authors.initials: S
authors.lastname: Liu
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gtwang@sandia.gov and Center for Integrated Nanotechnology, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
authors.forename: Ting S
authors.initials: TS
authors.lastname: Luk
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gtwang@sandia.gov.
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Figiel
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gtwang@sandia.gov and Center for Integrated Nanotechnology, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.
authors.forename: Igal
authors.initials: I
authors.lastname: Brener
authors.affiliation: Center for High Technology Materials, University of New Mexico, 1313 Goddard St. SE, Albuquerque, NM 87106, USA.
authors.forename: S R J
authors.initials: SR
authors.lastname: Brueck
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. gtwang@sandia.gov.
authors.forename: George T
authors.initials: GT
authors.lastname: Wang