GaN nanowire lasers with low lasing thresholds
Silvija GradečakHarvard University , Cambridge, Massachusetts 02138Fang QianHarvard University , Cambridge, Massachusetts 02138Yat LiHarvard University , Cambridge, Massachusetts 02138Hong‐Gyu ParkHarvard University , Cambridge, Massachusetts 02138Charles M. LieberHarvard University , Cambridge, Massachusetts 02138
2005en
ABI
Abstract
We report optically pumped room-temperature lasing in GaN nanowires grown by metalorganic chemical vapor deposition (MOCVD). Electron microscopy images reveal that the nanowires grow along a nonpolar ⟨11-20⟩ direction, have single-crystal structures and triangular cross sections. The nanowires function as free-standing Fabry–Pérot cavities with cavity mode spacings that depend inversely on length. Optical excitation studies demonstrate thresholds for stimulated emission of 22kW∕cm2 that are substantially lower than other previously reported GaN nanowires. Key contributions to low threshold lasing in these MOCVD GaN nanowire cavities and the development of electrically pumped GaN nanowire lasers are discussed.
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