Abstract
We utilize a plasmonic vortex lens (PVL) to retrieve the orbital angular momentum (OAM) distribution of light. The OAM modes are coupled to the surface plasmon polaritons (SPPs) in the form of various Bessel functions respectively. By decomposing the interference pattern of SPPs into these Bessel functions, we can retrieve the relative amplitude and the relative phase of input OAM modes simultaneously. Our scheme shows advantage in integration and can measure hybrid OAM states by one measurement.
Highlights
We utilize a plasmonic vortex lens (PVL) to retrieve the orbital angular momentum (OAM) distribution of light
The Plasmonic vortex lens (PVL) can couple the orbital angular momentum (OAM) into the form of various Bessel functions[6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22] and it was employed to measure the OAM of light[7]
In order to ensure the uniqueness of retrieved OAM distribution, the basic functions in Eq (3) must have different intensity distributions, namely, the value of m +s +l should not change its sign for all the input OAM modes
Summary
We utilize a plasmonic vortex lens (PVL) to retrieve the orbital angular momentum (OAM) distribution of light. By decomposing the interference pattern of SPPs into these Bessel functions, we can retrieve the relative amplitude and the relative phase of input OAM modes simultaneously. Light beams carrying OAM are associated with an azimuthal phase structure exp(ilφ), where φ is the angular coordinate and l is the azimuthal index, defining the topological charge (TC) of the OAM beams[23] These beams have an OAM of l per photon ( is Planck’s constant h divided by 2π). The OAM modes can be mapped to different Bessel functions through reasonably designing the PVL structure and this feature shows potential for retrieving the OAM distribution of light from the intensity patterns of SPPs. In this work, we put forward an integrated scheme to retrieve the OAM distribution of light with PVL. It offers an integrated scheme to measure hybrid OAM states by one measurement
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