Influence of Silver Film Quality on the Threshold of Plasmonic Nanowire Lasers

Haichao Yu, Themistoklis P H Sidiropoulos, Wei Liu, Carsten Ronning, Peter K. Petrov, Sang Hyun Oh, Stefan A. Maier, Peng Jin, Rupert F. Oulton

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

In recent years, the field of plasmonics has become dependent on the ability to maximize the quality of metal films. In particular, plasmonic lasers will require a metal loss as low as possible in order to minimize their operational threshold if they are to find applications. In this article, the findings of recent studies, which report reduced thresholds in plasmonic lasers incorporating high quality metal films with both ultraflat surfaces and high crystallinity, are reassessed. In particular, the role of deposition rate and substrate temperature on silver film growth for improving the performance of hybrid plasmonic zinc oxide nanowire lasers is studied. High substrate temperatures and high deposition rates allow near-epitaxial silver growth on mica. Even though a 2 fold reduction in metal loss for the cystalline films is demonstrated, the presented plasmonic lasers show only a modest reduction in threshold, compared to noncrystalline films. This finding is consistent with our observation that the plasmonic cavity loss is comparable to the absorption of the unexcited semiconductor. Laser threshold is thus only partially dependent on reducing metal film loss. This work increases the fundamental understanding of metal film quality in plasmonics and gives new insights into the threshold characteristics of metal-based lasers.

Original languageEnglish (US)
Article number1600856
JournalAdvanced Optical Materials
Volume5
Issue number6
DOIs
StatePublished - Mar 17 2017

Bibliographical note

Funding Information:
H.Y. and T.P.H.S. contributed equally to this work. This work was supported by the EPSRC Reactive Plasmonics Programme (EP/M013812/1) and Deutsche Forschungsgemeinschaft (FOR1616). S.A.M. further acknowledges the Royal Society and the Lee-Lucas Chair in Physics. Requests for further information under the open data policy of the EPSRC should be sent to datainquiryEXSS@imperial.ac.uk.

Publisher Copyright:
© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • epitaxial growth
  • plasmonic films
  • plasmonic nanowire lasers
  • silver films
  • template stripping

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