The functionality of simultaneous dichroism and wavefront manipulation of orthogonally polarized electromagnetic waves has attracted considerable attention in the fields of polarization imaging, polarization sensing, vector generation, and optical communication. However, the conventional methodology requires the combination of many optical components, which limits the integration and reduces the efficiency of optical systems. Although multilayer metasurfaces have been proposed to increase efficiency, complicated fabrication hinders its practical applications. Herein, we employ the monolithic all-dielectric metasurface to simultaneously implement linear dichroism and wavefront manipulation based on the principle of local polarization-selective constructive or destructive interference. The average transmittance exceeding 87.88% and polarization extinction ratio up to 23 dB are achieved by the all-dielectric metasurface at the central wavelength of 532 nm. It is believed that this high-performance metasurface may provide a novel scheme for the complex optical field manipulation and replace the bulk optical elements in polarization imaging or other optical domains.
Chirality is a key molecular structural concept and a ubiquitous phenomenon in nature that has become an increasingly significant research avenue. Here, we show that an all-dielectric metasurface, an array of spatially varying anisotropic nanofins, exhibits asymmetric wavefronts for forwardly and backwardly propagating circularly polarized lights. Similar to the asymmetric transmission phenomena, two wavefronts generated by one circular polarization from both sides of the proposed metasurface are not limited to the same or mirror symmetric, but also can be arbitrarily and independently manipulated. The observation of this novel effect originates from asymmetric photonic spin-orbit interactions. As an example, a metasurface is designed to produce an optical vortex and holographic image, respectively, when a circular polarization propagates through it in opposite directions. Due to its high efficiency and multifunctionality of the proposed metasurface, this work may have potential applications in many fields, such as optical communications, and provide new ideas for studying chiral and functional materials.
In the past decades, metasurfaces have shown their extraordinary ability to manipulate the wavefront of electromagnetic wave. However, the most of previously proposed designs based on metasurfaces are fixed once design, which are unsuitable for applications where light manipulation needs to be dynamically. In this paper, we proposed a design for dynamic wavefront manipulation achieved by the combination of metasurfaces and phase change materials (PCM) in the near infrared spectral range. Here, we present a metal-insulator-metal (MIM) configuration with the polarization conversion exceeding 80% for circular polarized (CP) light converted to its opposite handedness when PCM is in the amorphous state, but the efficiency turns to 0 when PCM switch into its crystalline state. By utilizing the Pancharatnam- Berry (PB) phase, we can achieve the dynamic wavefront manipulation between the amorphous and crystalline states. As a proof-of-concept, a deflector and focus lens are designed and characterized, and the results further verify the ability for dynamic wavefront manipulation. It is believed that the design in our work may pave the way towards the dynamic manipulation of light.
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