Localized surface plasmon resonances in core-embedded heterogeneous nano-bowtie antenna

We theoretically investigated the localized surface plasmon resonances in core-embedded heterogeneous nano-bowtie antenna. It is proposed that spatial distribution and spectral position for Au–Ag nano-bowtie antenna can be unprecedentedly tuned with respect to core ingredient, bowtie size and filling refractive index of environment. The tunable spectral and spacial properties are attributed to the modified plasmon dipole interaction within the core-embedded nano-bowtie, which can be well manipulated by the size of nano-bowtie antenna as well as the core ingredient. The study provides basic understanding for tuning near-field properties in core-embedded heterobowties for a wide range of applications such as single-molecule fluorescence, SERS and photo-thermal therapy.