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Temperature dependent absorption and emission enhancement factors in plasmon coupled semiconductor heterostructures
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Paper Abstract

Localized surface plasmon resonances can increase the quantum efficiency of photon emitters through both absorption and spontaneous emission enhancement effects. Despite extensive studies, experimental results that clearly distinguish the two plasmonic enhancement effects are rarely available. Here, we present clear spectral signatures of the plasmonic enhancement effects on the absorption (excitation) and spontaneous emission (Purcell factor) by analyzing the temperature dependent photoluminescence (PL) properties of InGaAs/GaAs single quantum well (QW) coupled to colloidal gold nanorods (AuNRs) at different GaAs capping layer thickness (d). We find that when the emitting InGaAs layer is close to the AuNRs (d = 5 nm), the plasmonic enhancement effect on the QW PL is dominated by the Purcell factor that significantly increases the external quantum efficiency of the QW that otherwise barely emits. When d is increased to 10 nm, the temperature dependence of the PL enhancement factor (F) reflects absorption enhancement in the capping layer followed by carrier diffusion and capture by the well. First F increases with temperature and then decreases following the temperature dependence of the carrier diffusion coefficient in GaAs. By factoring out the contribution of the captured carriers to F, it is shown that carrier transfer to the well reaches saturation with increasing incident laser power. In addition to providing insight into the plasmonic enhancement mechanism, the results presented in this work suggest that colloidal plasmonic nanoparticles can be used as simple probes for understanding carrier transport phenomena in arbitrary semiconductor heterostructures.

Paper Details

Date Published: 5 September 2019
PDF: 19 pages
Proc. SPIE 11081, Active Photonic Platforms XI, 110812A (5 September 2019); doi: 10.1117/12.2527770
Show Author Affiliations
Chih-Feng Wang, The Univ. of New Mexico (United States)
Sadhvikas Addamane, The Univ. of New Mexico (United States)
Ganesh Balakrishnan, The Univ. of New Mexico (United States)
Claudia Rivera Lebron, The Univ. of New Mexico (United States)
Sharmin Haq, The Univ. of New Mexico (United States)
Bisweswar Patra, The Univ. of New Mexico (United States)
Kevin J. Malloy, The Univ. of New Mexico (United States)
Terefe G. Habteyes, The Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 11081:
Active Photonic Platforms XI
Ganapathi S. Subramania; Stavroula Foteinopoulou, Editor(s)

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