Optical control of photon tunneling through an array of nanometer scale cylindrical channels

We report first observation of photon tunneling gated by light at a different wavelength in an artificially created array of nanometer scale cylindrical channels in a thick gold film. Polarization properties of gated light provide strong proof of the enhanced nonlinear optical mixing in nanometric channels involved in the process. This suggests the possibility of building a new class of "gated" photon tunneling devices for massive parallel all-optical signal and image processing.Comment: 4 pages, 4 figure

Numerical Investigation on Transition of Shock Induced Boundary Layer

The purpose or this paper is to examine the application or empirical models or boundary layer transition to the situation of shock wave propagation. Two-dimensional numerical simulations of shock wave propagation and shock-induced boundary layer motion were performed with the turbulent intermittency transport model of Menter et al (2004). The Launder-Sharma low-Reynolds k-ϵ model was used for the turbulence model and the boundary layer profiles were compared against the theoretical laminar profiles and the empirical turbulent profiles. The predicted transition Reynolds number in the present study was in good agreement with the shock tube experimental data