Abstract

We theoretically study strong coupling of a dipole emitter positioned close to a hyperbolic metamaterial (HMM) slab. Enhanced dipole emission with a large Purcell factor originated from the superposition of p-wave resonant coupling and critical coupling to the high-k waveguide modes in a HMM slab is addressed, and the dependence of the slab thickness and the fill ratio of metallic nanorods in HMM on the emission strength is explicitly summarized. Via optimizing the mode coupling condition, we point out a general design rule for the HMM structure to yield a large Purcell factor. Furthermore, by incorporating a Si bullseye grating on the HMM slab, 18-fold far-field radiation enhancement owing to extraction of the mainly coupled resonant mode in HMM is presented.

© 2019 Optical Society of America

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