How "particle-like" are photons? Is it possible to create a spin, like a billiard ball? If so, can a spinning photon (or electron etc.) be made to fit a curved path through a medium? I'm not sure whether or not a spinning mass is relevant in a vacuum with respect to direction.
Should spin be imparted onto a photon or electron, does this lend itself to applications where a particle source can be aimed to multiple locations through spin alone? This could lead to new micro-switches with higher processing speeds and less (if any) moving parts to achieve path differentiation.