content_image/348622.jpg
base diameter. 

## E. Effect of the tip termination 

<img src='content_image/348622.jpg'>

The last important aspect that we would like to address is the effect of the tip termi- nation. Previous studies on the field enhancement in triangular nanoparticles have shown that changing the tip termination can affect the results. 70,71 Here, we compare the case of a flat tip, shown in 5(a), with the case of a rounded tip having the same diameter, as shown in 5(b). We see that the resonance frequency and the antenna efficiency η$_{a}$ are almost the same. The only noticeable difference occurs for the Purcell factor F , which is larger for the case of a flat tip. This holds also if the flat and rounded ends have a diameter of 10 

