Hybrid metal-dielectric nanocavity for enhanced light-matter interactions

Kelaita, Yousif A. and Fischer, Kevin A. and Babinec, Thomas M. and Lagoudakis, Konstantinos G. and Sarmiento, Tomas and Rundquist, Armand and Majumdar, Arka and Vučković, Jelena (2016) Hybrid metal-dielectric nanocavity for enhanced light-matter interactions. Optical Materials Express, 7 (1). pp. 231-239. ISSN 2159-3930

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    Despite tremendous advances in the fundamentals and applications of cavity quantum electrodynamics (CQED), investigations in this field have primarily been limited to optical cavities composed of purely dielectric materials. Here, we demonstrate a hybrid metal-dielectric nanocavity design and realize it in the InAs/GaAs quantum photonics platform utilizing angled rotational metal evaporation. Key features of our nanometallic light-matter interface include: (i) order of magnitude reduction in mode volume compared to that of leading photonic crystal CQED systems; (ii) surface-emitting nanoscale cylindrical geometry and therefore good collection efficiency; and finally (iii) strong and broadband spontaneous emission rate enhancement (Purcell factor textasciitilde 8) of single photons. This light-matter interface may play an important role in quantum technologies.