摘要
Compared with electrons,there is one distinct feature of photons,known as multiple physical dimensions.Frequency/wavelength,time,complex amplitude and polarization are typical physical dimensions of photons.Very recently,the spatial structure of photons,the only known physical dimension left,has attracted increasing interest in full access of photons worthy of exploration.Manipulating these physical dimensions of photons enables a diversity of light related applications such as trapping,sensing,metrology,microscopy,imaging,quantum information processing and optical communications.
