Abstract
Turn your face to the sun on a summer’s day and the warmth you feel is a clear and simple demonstration that light carries energy. It has long been known that it also carries both linear momentum and angular momentum and that these can be used to manipulate microscopic objects. Indeed, the idea that a single photon has energy ℏω, momentum ℏk and can carry orbital angular momentum ℏℓ is now well-established.
© 2015 IEEE
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