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HMM. (a) Isofrequency surface of a hyperbolic metamaterial in k-space which supports waves with arbitrary large wavevector, ensuring extremely large photonic density of states. (b) Schematic of the fabricated HMM sample. The sample consists of 16 alternating gold and alumina layers, each 19 nm thick. The overall thickness is 304 nm. (c) Dielectric functions of fabricated HMM retrieved by spectroscopic ellipsometry measurements, within the range of the plot (550–900 nm) , .
Coupling of nitrogen-vacancy centers with HMM. (a) Schematic of the experimental sample consisting of HMM (16 alternating layers of Au and Al2O3, thickness of each layer—19 nm), 30-nm-thick spacer layer composed of SU-8 photoresist, and nanodiamonds with NV centers inside. (b) Emission spectra of NV centers when nanodiamonds are placed on HMM. Excitation is 488-nm line of Ar/Kr continuous-wave laser (0.5 mW).
Experimentally measured spontaneous emission lifetimes. Histograms of the NV center lifetimes on (a) coverslip and (b) HMM. Corresponding mean values (standard deviations) of the lifetime distributions are (a) 20.89 ns (1.15 ns), (b) 1.55 ns (0.95 ns). HMM is deposited onto coverslip. In order to avoid photoluminescence quenching by metallic surface, spacer layer (diluted SU-8) is introduced between nanodiamonds and sample substrate.
Experimental results of measurements of lifetime (τ), integrated emission intensity (I), and absorption (A) for evaluation of relative radiative decay rates (Γ/Γref) using Eq. (2) .
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