Fabry-Perot Microcavity Modes in Single GaP/GaNP Core/Shell Nanowires.
Semiconductor nanowires (NWs) are attracting increasing interest as nanobuilding blocks for optoelectronics and photonics. A novel material system that is highly suitable for these applications are GaNP NWs. In this article, we show that individual GaP/GaNP core/shell nanowires (NWs) grown by molecular beam epitaxy on Si substrates can act as Fabry-Perot (FP) microcavities. This conclusion is based on results of microphotoluminescence (μ-PL) measurements performed on individual NWs, which reveal periodic undulations of the PL intensity that follow an expected pattern of FP cavity modes. The cavity is concluded to be formed along the NW axis with the end facets acting as reflecting mirrors. The formation of the FP modes is shown to be facilitated by an increasing index contrast with the surrounding media. Spectral dependence of the group refractive index is also determined for the studied NWs. The observation of the FP microcavity modes in the GaP/GaNP core/shell NWs can be considered as a first step toward achieving lasing in this quasidirect bandgap semiconductor in the NW geometry.
Department of Physics, Chemistry and Biology, Linköping University, 581 83, Linköping, Sweden.
Alexander
A
Dobrovolsky
Department of Physics, Chemistry and Biology, Linköping University, 581 83, Linköping, Sweden.
Jan E
JE
Stehr
Graduate Program of Materials Science and Engineering, La Jolla, CA, 92093, USA.
Supanee
S
Sukrittanon
Department of Physics, University of California, La Jolla, CA, 92093, USA.
Yanjin
Y
Kuang
Department of Electrical and Computer Engineering, University of California, La Jolla, CA, 92093, USA.
Charles W
CW
Tu
Department of Physics, Chemistry and Biology, Linköping University, 581 83, Linköping, Sweden.
Weimin M
WM
Chen
Department of Physics, Chemistry and Biology, Linköping University, 581 83, Linköping, Sweden.
Irina A
IA
Buyanova
Fabry-Perot; GaNP; microcavities; nanowires