Hossein Shahrokhabadi - Photonics and Quantum Technologies Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran
Reza Goodarzi, - Photonics and Quantum Technologies Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran
Mohamad Barzan, - Photonics and Quantum Technologies Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran
Mohamadreza A. Moghadam, - Photonics and Quantum Technologies Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, Iran

In this report, we numerically examined the possibility of application of perforated perfect metal slab containing a central Nano-slit and unilaterally symmetric grooves on the output surface as the focalizing apparatus. Results of the theoretical simulations through the Finite Difference Time-Domain method revealed that the unilaterally distributed indentations can be utilized for focusing incident plane wave at the plasmon polariton resonance condition. Therefore the presented one sided grooves structure can be used instead of bilaterally corrugated aperture proposed by F. Garcıa-Vidal et al. Furthermore, the outcomes of investigations indicated that the out of resonance incident beam diverges immediately after passing through the subwavelength slit.

Finite Difference Time Domain Method, Plasmonics, Subwavelength Slit, Corrugation