A high-quality factor hybrid plasmonic nanocavity based on distributed Bragg reflectors

Tu Linlin¹, Zhang Chi¹, Huang Zhong¹, Yau Jason^{1, 3}, Zhan Peng^{1, 2, †,}, Wang Zhenlin^{1, 2, ‡,}

(a) Schematic diagram of the hybrid plasmonic nanocavity, which comprises a high-index semiconductor nanowire separated from a patterned metal substrate by a nanoscale low-index dielectric gap. (b) Dependence of the real part of the effective refractive indices on the incident wavelength. The insets are the normalized electric field distributions in the yz plane corresponding to the two grating sub-period regions.