Journal
OPTICS EXPRESS
Volume 27, Issue 14, Pages 19119-19129Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.019119
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Funding
- National Research Foundation of Korea (NRF) Korea government Ministry of Science and ICT [2017R1C1B2003585, 2017R1A4A1015565]
- National Research Foundation of Korea [2017R1C1B2003585] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A metasurface is a planar optical device that controls the phase, amplitude, and polarization of light through subwavelength-scale unit elements, called meta-atom. The tunability of plasmonic vortex lens (PVL) which generates surface plasmon polaritons (SPPs) carrying orbital angular momentum can be improved by using meta-atom. However, conventional PVLs exhibit nonuniform field profiles according to the incident polarization states owing to the spin-orbital interaction (SOI) effect observed during SPP excitation. This paper describes a method of compensating for SOI of PVL by using the geometric phase of distributed nanoslits in a gold film. By designing the orientation angles of slit pairs, the anti-phase of the SOI effect can be generated for compensatory effect. In addition, polarizationindependent PVLs are designed by applying a detour phase based on the position of the slit pairs. PVLs for center-, off-center-, and multiple-focus cases are demonstrated and measured via a near-field scanning microscope. (c) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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