Multi-colour emission from GaAs core-AlGaAs shell photonic nanowires

S. Mokkapati, D. Saxena, Nian Jiang, Q. Gao, H. H. Tan, C. Jagadish

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Semiconductor nanowires grown via the vapour-liquid-solid (VLS) mechanism are promising for miniaturisation of optoelectronic devices. Efficient optoelectronic devices require these nanowires to have high quantum efficiency. While optimizing the growth process to eliminate bulk defects and achieve perfect surface passivation is one approach to increase the quantum efficiency of nanowires1, coupling the nanowires to resonant plasmonic structures to reduce the radiative lifetime of carriers in the semiconductor is an alternative approach. In this paper, we demonstrate increase in quantum efficiency of AlGaAs shell of GaAs core-AlGaAs shell-GaAs cap nanowires (Figure 1(a)) by coupling the nanowires to plasmonic nanoparticles deposited on their surface. Increase in quantum efficiency of the AlGaAs shell leads to multi-colour emission from the nanowires (from the band-edge of GaAs core and the AlGaAs shell). This approach to achieve multi-colour emission from the nanowires does not rely on the growth of quantum confined layers like quantum wells or quantum dots in the nanowires. In addition to achieving multi-colour emission, our approach also provides independent control on the polarization response of emission from the GaAs core and the AlGaAs shell of the nanowires2.

Original languageEnglish
Title of host publication2013 IEEE Photonics Conference, IPC 2013
Number of pages2
Publication statusPublished - 1 Dec 2013
Externally publishedYes
EventIEEE Photonics Conference 2013 - Bellevue, United States of America
Duration: 8 Sep 201312 Sep 2013
Conference number: 26th (Proceedings)

Publication series

Name2013 IEEE Photonics Conference, IPC 2013


ConferenceIEEE Photonics Conference 2013
Abbreviated titleIPC 2013
CountryUnited States of America
Internet address

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