Dielectric metasurfaces is a plane optical device to achieve the desired function by modulating amplitude and phase, polarization for the incident light, and its transmission efficiency is higher than other metasurfaces, these advantages lead to dielectric metasurfaces will be used widely in the future. Nevertheless, the majority of metasurfaces are planar singlelayered structure, which limit seriously the view field and effect of monochromatic imaging. Here, we demonstrate a composed dielectric meta-lens doublet by the electromagnetic simulation can achieve perfectly diffraction-limited monochromatic focus for the polarization-insensitive incident lights at a wavelength of 375 nm, which has the view field of 60°, the numerical aperture of 0.5, and a focal length of 380μm. Due to the dielectric meta-lens doublet has the scaling of subwavelength at ultraviolet light, and the devices have high distinguishability, it can be used widely in nanolithography, imaging with large view field, and 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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