Dressed polarizability and absorption of a dipole nano-antenna in an arbitrary environment

摘要

In this work, we show how the absporption cross-section of a dipole nano-antenna is modified by the local environment. In particular, we clarify the key role of the Local Density of States (LDOS) and show the analogy that exists with quantum emitters. This link with the LDOS shows that it is possible to probe the LDOS inside a structured environment with a nano-particle. Conversely, we can design nano-structures to control the level of absorption in a nano-particle, a strong limitation for applications in nanophotonics. The theoretical results are illustrated numerically in the simple case of a silver particle near a perfect mirror.