Manifesting Simultaneous Optical Spin Conservation and Spin Isolation in Diatomic Metasurfaces

Yang

Badloe

et al. 2021

InfoMat

Self Cite

Metasurfaces consisting of subwavelength structures, so‐called meta‐atoms, have steadily attracted considerable attention for advanced holography due to their advantages in terms of high‐resolution holographic images, large field of view, and compact device volume. In contrast to conventional holographic displays using bulky conventional diffractive optical elements, metasurface holography enables arbitrary complex wavefront shaping with a much smaller footprint. In this review, we classify metasurface holography according to the meta‐atom design methodologies, which can further expand hologram functionalities. We describe light‐matter interactions, particularly in metasurface systems, using the relevant the Jones matrix to rigorously explain modulations of the amplitude, phase, and polarization of light. Six different types of meta‐atoms are presented, and the corresponding achievable wavefronts that form the holographic images in the far‐field are also provided. Such a simple classification will give a straightforward approach to design and further realize advanced metasurface holographic devices.

Section: Discussionmentioning

confidence: 99%

Geometric and physical configurations of meta‐atoms for advanced metasurface holography

Yang

Badloe

et al. 2021

InfoMat

Self Cite

Advanced Photonics Research

“…Research on metasurfaces has improved their functionality, performance, and, along with the development of reconfigurable metasurfaces with actively tunable properties, has unlocked new fields of nanophotonics. New design techniques that combine multiple meta‐atoms [ 228 ] or optical phenomena [ 229,230 ] in a single metasurface to produce metasurfaces that are polarization‐ or direction‐sensitive could be useful for the integration of modulation methods that control the polarization of light. The materials that make up metasurfaces are a key ingredient to attain tunable functional devices.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Tunable Metasurfaces: The Path to Fully Active Nanophotonics

Badloe

Lee

Seong

et al. 2021

Self Cite

In the field of nanophotonics, metasurfaces have come to the forefront in real‐world applications, owing to their accessible exotic optical properties that can be readily designed and fabricated using currently available techniques. The subwavelength dimensions and lightweight characteristics of metasurfaces are attractive qualities for the miniaturization of optical devices and are already exploited in devices that can rival, and sometimes even outperform, conventional bulky optics. Over the past decade, ample research has been undertaken to produce high‐performance metasurfaces with exciting optical properties that cannot be found in nature or achieved with conventional optics. To open the path to widely used devices in our everyday lives, the next obvious step for metasurfaces is the development of tunability. Herein, the techniques and development of applications of tunable metasurfaces are presented through the incorporation of active materials and controllable external stimuli, and the uncovered tunable characteristics are critically analyzed. The review rounds up by proposing the future directions and prospects for actively tunable metasurfaces and their potential practical applications.

“…( f ) is adapted from reference [ 107 ]. ( g ) is adapted from reference [ 108 ]. ( h ) is adapted from reference [ 109 ].…”

Section: Applications Of Chiral Metasurfacesmentioning

confidence: 99%

“…In 2021, Rho’s group demonstrated a reflective type of chiral metahologram that achieved both spin conversion and spin isolation via two types of meta-atoms in a superpixel [ 108 ]. The two meta-atoms make superpixels and had the same relative angle of two meta-atoms, but different angles of the superpixels.…”

Section: Applications Of Chiral Metasurfacesmentioning

confidence: 99%

Chiroptical Metasurfaces: Principles, Classification, and Applications

Rana

et al. 2021

Sensors

Self Cite

Chiral materials, which show different optical behaviors when illuminated by left or right circularly polarized light due to broken mirror symmetry, have greatly impacted the field of optical sensing over the past decade. To improve the sensitivity of chiral sensing platforms, enhancing the chiroptical response is necessary. Metasurfaces, which are two-dimensional metamaterials consisting of periodic subwavelength artificial structures, have recently attracted significant attention because of their ability to enhance the chiroptical response by manipulating amplitude, phase, and polarization of electromagnetic fields. Here, we reviewed the fundamentals of chiroptical metasurfaces as well as categorized types of chiroptical metasurfaces by their intrinsic or extrinsic chirality. Finally, we introduced applications of chiral metasurfaces such as multiplexing metaholograms, metalenses, and sensors.