Investigation of the influence of amplitude spiral zone plate parameters on produced energy backflow
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Investigation of the influence of parameters of silver, aluminum, gold, and chromium spiral zone plates on the longitudinal component of Umov-Pointing vector in produced optical vortices by using the frequency-dependent finite-difference time-domain method is presented. It is shown that the aluminum spiral zone plate with a relief height of 50 nm gives an optical vortex with the smallest longitudinal component of Umov-Pointing vector on the optical axis. The gold spiral zone plate is the least effective for the formation of vortex beams with a reverse energy flow.
2021 ◽
2013 ◽
Vol 34
(12)
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pp. 2999-3005
1997 ◽
2000 ◽
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1995 ◽
Vol 8
(3-4)
◽
pp. 221-232
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2021 ◽
Vol 1901
(1)
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pp. 012111
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