2006

A. Bitman, N. Sapiens, G. Bartal, L. Secundo, M. Segev, and A. J. Agranat, “Electroholographic Tunable Volume Grating in the g44 Configuration,” Optics Letters , vol. 31, no. 19, pp. 2849-2851, 2006.Abstract
The g(44) grating is an electroholographic transmission grating in which the applied field is perpendicular to both the grating vector and the wave vector of the incident beam. It is argued that in this configuration the incident beam traverses through a periodically rotating index ellipsoid. It is shown that in the g(44) configuration the Bragg condition is fulfilled for a specific value of the applied field and for a diffracting beam polarization that is perpendicular to that of the incident beam. Consequently, the g(44) grating can be used as an electrically controlled filter. Tunability of 7 nm is demonstrated in a 2mm thick grating.
H. Ilan, A. Gumennik, R. Fathei, A. J. Agranat, I. Shachar, and M. Hass, “Submerged waveguide constructed by implantation of 12C ions in electrooptic crystals,” Applied Physics Letters, vol. 89, no. 24, 2006.Abstract
Waveguide structures were fabricated in potassium lithium tantalate niobate crystals by the implantation of high energy C12 ions. The implantation forms an amorphous layer with a lowered index of refraction within the depth of the crystal, which serves as the cladding of the waveguides. Two amorphous layers were fabricated at 18.8 and 25.6 μm below the surface of the crystal by implantation at 30 and 40 MeV, respectively. This formed a submerged slab waveguide sandwiched between the two amorphous layers and two slab waveguides that were formed between the surface of the crystal and each of the amorphous layers. Coupling between those waveguides was observed and investigated, and confinement of the light in the sandwiched waveguide was demonstrated. © 2006 American Institute of Physics.