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Multilayer hyperbolic metamaterials consisting of alternating metal anddielectric layers have important applications in spontaneous emissionenhancement. In contrast to the conventional choice of at least dozens oflayers in multilayer structures to achieve tunable Purcell effect on quantumemitters, our numerical calculations reveal that multilayers with fewer layersand thinner layers would outperform in Purcell effect. These discoveries areattributed to the negative contributions by an increasing layer number to theimaginary part of the reflection coefficient, and the stronger coupling betweensurface plasmon polariton modes on a thinner metal layer. This work couldprovide fundamental insights and practical guide for optimizing the localdensity of optical states enhancement functionality of ultrathin and eventwo-dimensional photon sources.

Few-layer hyperbolic multilayer for spontaneous emission enhancement