  The generation of the localized surface plasmon resonance (LSPR) on the
surface of plasmonic structures in the nanoscale has paved the way for advanced
biosensing, surpassing the conventional detection limits. The electric field
enhancement (electromagnetic hot spots) between two plasmonic nano structures
at close quarters produces hot electrons with a change in the electron density
of the material. Techniques such as photoinjection are suitable to inject hot
electrons from the metal crossing the Schottky barrier to the semiconductor
leading to the development of photocurrent. sea urchin looking spiked
nanoparticles serve a great interest in research of plasmonic materials as they
can generate hot electrons at higher rate compared to other structures. By
means of finite element method (FEM) analysis, we investigate the electric
field enhancement generated between the cavity of nano star spike pairs and
extend the study to an array of them. We further do a parametric study and
identify the importance of using such an array to generate hot electrons whose
applications are envisaged for light harvesting, enhanced photodetection, photo
catalysis etc.
