Efficient suppression of radiation damping in resonant retardation-based plasmonic structures

We propose an innovative approach to the design of retardation-based plasmonic structures allowing efficient suppression of radiation damping and increase in resonance quality (Q) factors. The underlying idea consists of conformal structure transformation suppressing its electric-dipole response in favor of magnetic-dipole one. We show that bending of plasmonic nanoantennas increases significantly their Q factors up to the electrostatic limit while preserving the nature of resonance along with its exceptional features such as linear size-dependent tunability and robust field enhancement.