Unidirectional light propagation through two-layer nanostructures based   on optical near-field interactions
  We theoretically demonstrate direction-dependent polarization conversion efficiency, yielding unidirectional light transmission, through a two-layer nanostructure by using the angular spectrum representation of optical near-fields. The theory provides results that are consistent with electromagnetic numerical simulations. This study reveals that optical near-field interactions among nanostructured matter can provide unique optical properties, such as the unidirectionality observed here, and offers fundamental guiding principles for understanding and engineering nanostructures for realizing novel functionalities. 
Makoto Naruse, Hirokazu Hori, Satoshi Ishii, Aur\'elien Drezet, Serge   Huant, Morihisa Hoga, Yasuyuki Ohyagi, Tsutomu Matsu...
physics.optics