Ray of light on an object?

Hi all…
How i can create a ray of light on an object like this?https://youtube.com/watch?v=p2bqjEPJz8EOn the object that i can take

I would create that effect by using a cylindrical mesh, turn off collision for it, then apply a 2 sided (semi-) transparent and emissive material.

there is it in any tutorials? Or someone can tell me how i can create one?