We demonstrate some basic all-optical (electrically unbiased) logic gates in azobenzene liquid crystalline cells, exploiting their large nonlinearity for light localization and the trans-cis photoisomerization for all-optical external control. Spatial solitons were excited at microwatt power levels at 632.8 nm, whereas gating and switching were achieved with milliwatt beams at 409 mn.
Serak SV, Tabiryan NV, Peccianti M, & Assanto G (2006). Spatial soliton all-optical logic gates RID F-7127-2011. IEEE PHOTONICS TECHNOLOGY LETTERS, 18(9-12), 1287-1289 [10.1109/LPT.2006.872318].