Giant Kerr response of ultrathin gold films from quantum size effect.

摘要: With the size of plasmonic devices entering into nanoscale region, impact quantum physics needs to be considered. In past, effect on linear material properties has been studied extensively. However, nonlinear aspects have not explored much so far. On other hand, effort put field integrated optics and a medium with large nonlinearity is desirable. Here we study optical nanometre scale gold well by using z-scan method spectrum broadening technique. The results in giant Kerr susceptibility, which four orders magnitude higher than intrinsic value bulk several larger traditional media. Such high enables efficient interaction within microscopic footprint, making metallic films promising candidate for applications.