Angular momentum of light

Every student knows that massive spinning objects, like a bicycle wheel, possess an angular momentum directed along the axis of rotation. Perhaps fewer students know that also non-massive physical systems, as light, may exhibit an angular momentum which becomes manifest when light interacts with matter. In this talk I will present a general survey of the concept of angular momentum of light mainly focusing on its historical development. In addition, I will illustrate some examples of relevant practical and fundamental applications of this fascinating and timely subject. In particular, the so-called geometric spin Hall effect of light will be illustrated in some detail.