Controlling the light diffraction through a single subwavelength metallic slit via phase gradient

Abstract In this work, we show that the concept of phase gradient metasurfaces provides a versatile way to control the diffraction of light through small holes or slits. As an example, we consider a single subwavelength metallic slit surrounded by air grooves of gradient depth that induces the expec...

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Bibliographic Details
Published inNew journal of physics Vol. 25; no. 5; pp. 53004 - 53010
Main Authors Li, Songsong, Fu, Yangyang, Gao, Lei, Jiang, Jian-Hua, Xu, Yadong
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.05.2023
Subjects
Design
Dipoles
extraordinary optical transmission
Grooves
Incident light
Light
Light diffraction
Magnetic fields
Metal plates
Optics
phase gradient metasurfaces
Physics
Plasmons
Silver
Slits
subwavelength metallic slit
surface plasmons
Symmetry
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Summary:Abstract In this work, we show that the concept of phase gradient metasurfaces provides a versatile way to control the diffraction of light through small holes or slits. As an example, we consider a single subwavelength metallic slit surrounded by air grooves of gradient depth that induces the expected phase gradient. It is found that for normal incident light, the phase gradient can enable unidirectional excitation of surface plasmons, which flow directionally toward the slit, resulting in extraordinary optical transmission beyond that in conventional ways. Using this scheme, unidirectional radiation of an optical dipole located inside the slit can be obtained when different phase gradients are applied to both sides of the metal plate.
Bibliography:NJP-115826.R1
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/acd0cc