Metasurfaces are the arrangement of the artificially fabricated nanoantenna, which can control light scattering characteristics in a compact manner. Thanks to their versatile functionalities, the applications of the metasurfaces have been studied to replace various optical devices, including imaging and AR/VR devices. In this talk, we will introduce our research on metasurface holograms and metalenses related to imaging and AR/VR. First, the metasurface that combines the Pancharatnam-Berry phase and the generalized Kerker effect is not limited to control either transmission or reflection side but allows light control over the entire space. Utilizing this platform, independent hologram images and beam deflections for transmission and reflection are demonstrated. Also, a quadrumer structure that vertically transmits light that is incident at a specific angle is designed. We present a device that reproduces different holograms depending on the angle of incidence by encoding the multiplexed four phase profiles with the detour phase principle. Next, in the doublet metalens scheme, one side corrects chromatic aberration and monochromatic aberrations, and the other side performs focusing and filtering of the three primary colors in the visible spectrum. This doublet metalens corrects the aberrations of the targeted colors while having a high numerical aperture (NA). Finally, the metalens eyepiece with a high numerical aperture can realize a compact system to combine a real scene and a virtual image. In addition, our metalens shows a wide field-of-view, which can overcome the flaws of existing AR devices. These metasurface applications would be upstanding solutions for optical display technology.
Here, we present the metasurface design to split the incident light into transmission and reflection spaces according to its polarization states, and at the same time, the distinct phase profiles are imparted to each space. For implementation of this scheme, the linearly birefringent meta-atom is utilized for distinct phases at different polarization states. Interleaving methods is also utilized for switching the transmission-type into reflection-type. Three samples are fabricated for experimental demonstration of proposed scheme, each of them is operating in linear, circular, and elliptical polarization pair. We expect the miniaturization of conventional system might be achieved using this scheme.
We experimentally demonstrate that dielectric metasurface can generate multi-channel vortex beams possessing different orbital angular momentums with arbitrarily engineered spin-orbit interactions. We propose a design principle of the proposed meta-atom that can modulate and switch spatial complex-amplitude information. Experimental results show that the proposed metasurface can generate multi-channel vortex beam arrays without interval noises, and it can make each vortex beam channel possess different spin-orbit conversion when the incident polarization is changed. These results provide a new opportunity to implement a novel vortex beam modulator, which can be applied for future development of quantum optics and optical communications.
Metasurfaces are planar optical devices consisting of artificially fabricated photonic meta-atoms with unique optical responses, and have been extensively studied for thier extraordinary abilities to modulate electromagnetic waves. The field of metasurfaces have focused on the wavefront shaping, and many approaches have been proposed to implement novel optical devices with various versatility. In particular, metasurfaces have been shown to be able to implement high-quality holographic reconstructions of light with both spatial amplitude and phase information at the subwavelength-scale resolution, expected to be applied for the next generation imaging technology such as three-dimensional holographic imaging and optical data storage. In addition, metasurface lenses, called metalenses, have such powerful features as flatness, high numerical aperture, and multi-functions that do not appear in convensional optical lenses. Based on these meta-optics, recent advances in metasurfaces have led to the development of new optical applications using these meta-optics, and several studies have begun to be reported recently.
In this talk, several optical metasurface platforms for manipulation of electromagnetic waves will be presented. We will outline the physical mechanisms and concepts of the optical metasurfaces. A variety of metasurfaces providing amplitude, phase and polarization modulations will be introduced and discussed about their features. Then, we will discuss their recent states for optical applications such as holography, microscope, and augmented reality. Especially, our recent works that show their feasiblity in augmented reality imaging with ultrawide field of view not shown in convensional optics. Finally, our perspectives in this area will be discussed.
Various optical imaging devices have been significantly developed as commercial products including digital cameras, smartphone displays, and three-dimensional microscopes in the electronic industry until now. Such a rapid development makes many people expect more advanced devices which may be not only multifunctional but also smaller and lighter. However, we cannot achieve it only by scaling down conventional optic systems due to the limits of inherent volume needed in classical optic parts. Nanophotonics can be a potential candidate to overcome the intrinsic problem. In particular, plasmonic and metasurface nanostructures have been briskly studied in recent years because they are able to control input lights within a few hundred nanometers of a thin layer. Here we introduce some representative cases of them for optical imaging. We firstly propose a cavity-aperture, which is comprised of a cavity and a metal nanoaperture, to change the color and intensity of the light transmitted through a single pixel. Because a cavity organizes various lights having different wavelengths and a nanoaperture spatially selects one of them without a serious distortion of a light field distribution, we can extract a light with a specific wavelength and amplitude using the cavity-aperture. Some metasurface nanostructures are also suggested for a broadband polarimeter, circular polarizer, directional switching, and holographic imaging. They are useful in dramatically miniaturizing optical devices due to their thin and compact sizes. We expect these plasmonic and metasurface nanostructures have a potential for advanced portable imaging systems.
Metasurfaces, consisting of subwavelength nanostructures, have been considered a future holographic device that demonstrates unprecedented ability to control electromagnetic waves. In this invited talk, a general introduction to metasurface holography will be presented along with physical instruments and applications. In addition, complete complex-amplitude modulation holograms will be discussed in their theoretical and experimental demonstrations. Then we will discuss our vision of the future of this field including optical metasurfaces and meta-holograms.
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