A Review on Metasurface: From Principle to Smart Metadevices

Abstract

Metamaterials are composed of periodic subwavelength metallic/dielectric structures that resonantly couple to the electric and magnetic fields of the incident electromagnetic waves, exhibiting unprecedented properties which are most typical within the context of the electromagnetic domain. However, the practical application of metamaterials is found challenging due to the high losses, strong dispersion associated with the resonant responses, and the difficulty in the fabrication of nanoscale 3D structures. The optical metasurface is termed as 2D metamaterials that inherent all of the properties of metamaterials and also provide a solution to the limitation of the conventional metamaterials. Over the past few years, metasurfaces; have been employed for the design and fabrication of optical elements and systems with abilities that surpass the performance of conventional diffractive optical elements. Metasurfaces can be fabricated using standard lithography and nanoimprinting methods, which is easier campared to the fabrication of the counterpart 3 days metamaterials. In this review article, the progress of the research on metasurfaces is illustrated. Concepts of anomalous reflection and refraction, applications of metasurfaces with the Pancharatanm-Berry Phase, and Huygens metasurface are discussed. The development of soft metasurface opens up a new dimension of application zone in conformal or wearable photonics. The progress of soft metasurface has also been discussed in this review. Meta-devices that are being developed with the principle of the shaping of wavefronts are elucidated in this review. Furthermore, it has been established that properties of novel optical metasurface can be modulated by the change in mechanical, electrical, or optical stimuli which leads to the development of dynamic metasurface. Research thrusts over the area of tunable metasurface has been reviewed in this article. Over the recent year, it has been found that optical fibers and metasurface are coagulated for the development of optical devices with the advantages of both domains. The metasurface with lab-on fiber-based devices is being discussed in this review paper. Finally, research trends, challenges, and future scope of the work are summarized in the conclusion part of the article.‬‬‬‬‬‬‬

Recent Advancement in Optical Metasurface: Fundament to Application

“…The plasmonic nanorods experience a rapid phase shift with different amplitudes by varying their length and opening angle, as demonstrated in Figure 1 C. The physics of the V-shaped-based antenna and its systematic model were explored in great depth by Capasso’s group. The crossed polarized scattered light can possess a wide range of phases and amplitudes achieved by altering the antenna geometry, orientation, and antenna polarization as first proven by Yu et al and subsequently demonstrated by Ni et al in mid-infrared and near-infrared, respectively [ 25 , 26 ]. The antennas in the array are shaped and oriented so that they exhibit a variety of resonant properties.…”

Modeling of second-order nonlinear metasurfaces

“…Interestingly, an assembly of nanoparticles can bring about even more subtle control over linear and nonlinear scattering [17,18]. Specifically, for artificial 3D structures made of a periodic or pseudo-periodic arrangement, a strong magnetic response can be obtained, opening up the possibility to achieve negative refractive index within a certain wavelength range [19]. This ultimately led to the emergence of nonlinear metamaterials [16,[20][21][22][23].…”

Femtosecond Laser Direct Writing of Gradient Index Fresnel Lens in GeS2-Based Chalcogenide Glass for Imaging Applications

“…In order to simplify the optical system before the sensor and to maintain a high image quality, optical designers have to find new degrees of freedom in their designs. Several avenues have been thus explored, such as freeform optics [1], GRIN (gradient index) optics [2] and metasurfaces [3]. GRIN optics involve creating a spatial variation of the refractive index in the material.…”