Generating tightly focused perfect optical vortex for ultra-secure optical encryption
Light's orbital angular momentum (OAM) with inherent mode orthogonality has been suggested as a new way to the optical encryption. However, the dependence of annular intensity profiles on the topological charge complicates nanoscale light-matter interactions and hampers the ultra-secure encrypt...
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Zusammenfassung: | Light's orbital angular momentum (OAM) with inherent mode orthogonality has
been suggested as a new way to the optical encryption. However, the dependence
of annular intensity profiles on the topological charge complicates nanoscale
light-matter interactions and hampers the ultra-secure encryption application.
In this paper, we demonstrate ultra-secure image encryption by tightly focusing
perfect optical vortex (POV) beams with controllable annular intensity profiles
and OAM states. A simple scheme composed of single spatial light modulator is
proposed to generate radius-controllable POV in tightly focused beams. Such
focused POV beams with identical intensity profiles but varied OAM states are
applied to disorder-coupled gold nanorod aggregates to selectively excite
electromagnetic hot spots for encoding information through photothermal
deformation. As such, ultra-secure image encryption in OAM states of POV beams
in combination with different polarizations can be achieved. Our results lay
the ground for diverse nanophotonic applications harnessing the OAM division of
POV beams. |
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DOI: | 10.48550/arxiv.2111.00773 |