Abstract
Multifunctional optical devices are desirable at all times due to their features of flexibility and high efficiency. Based on the principle that the phase of excitation light can be transferred to the generated surface plasmon polaritons (SPPs), a plasmonic grating with three functions is proposed and numerically demonstrated. The Cherenkov SPPs wake or nondiffracting SPPs Bessel beam or focusing SPPs field can be correspondingly excited for the excitation light, which is modulated by a linear gradient phase or a symmetrical phase or a spherical phase, respectively. Moreover, the features of these functions such as the propagation direction of SPPs wake, the size and direction of the SPPs Bessel beam, and the position of SPPs focus can be dynamically manipulated. In consideration of the fact that no extra fabrication is required to obtain the different SPPs fields, the proposed approach can effectively reduce the cost in practical applications.
Highlights
Similar to an electromagnetic wave propagating along a metal/dielectric interface, surface plasmon polaritons (SPPs) are capable of shorter wavelength, tighter field confinement, and stronger field enhancement than the excitation light in the free space [1]
The plasmonic grating consists of subwavelength periodical slits etched on the gold film
Linearly polarized plane wave is normally incident on the spatial light modulator (SLM) and the wavefront of the transmitted wave is modulated by the phase mask loaded on the SLM
Summary
Similar to an electromagnetic wave propagating along a metal/dielectric interface, surface plasmon polaritons (SPPs) are capable of shorter wavelength, tighter field confinement, and stronger field enhancement than the excitation light in the free space [1]. The SPPs devices with different functions including the focusing lens [8,9], reflection mirror [10], hologram [11], logic operation [12], vortex [13,14], and nondiffracting beam generation [15,16,17] have been demonstrated by designing the position and shape of metallic or dielectric structures. The proposed multifunctional plasmonic grating can play different roles as needed, which are efficiency and flexibility in applications
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