Large spontaneous emission rate enhancement in grating coupled hyperbolic metamaterials

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作者：
Kandammathe Valiyaveedu Sreekanth
Koduru Hari Krishna
Antonio De Luca
Giuseppe Strangi
机构：
[1] Case Western Reserve University,Department of Physics
[2] University of Calabria,Department of Physics and CNR
来源：
Scientific Reports | / 4卷
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摘要：
Hyperbolic metamaterial (HMM), a sub-wavelength periodic artificial structure with hyperbolic dispersion, can enhance the spontaneous emission of quantum emitters. Here, we demonstrate the large spontaneous emission rate enhancement of an organic dye placed in a grating coupled hyperbolic metamaterial (GCHMM). A two-dimensional (2D) silver diffraction grating coupled with an Ag/Al2O3 HMM shows 18-fold spontaneous emission decay rate enhancement of dye molecules with respect to the same HMM without grating. The experimental results are compared with analytical models and numerical simulations, which confirm that the observed enhancement of GCHMM is due to the outcoupling of non-radiative plasmonic modes as well as strong plasmon-exciton coupling in HMM via diffracting grating.
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