Ultracompact Broadband Plasmonic Polarimeter

2019

Nanophotonics

Self Cite

Metasurfaces have received enormous attention thanks to their unique ability to modulate electromagnetic properties of light in various frequency regimes. Recently, exploiting its fabrication ease and modulation strength, unprecedented and unique controlling of light that surpasses conventional optical devices has been suggested and studied a lot. Here, in this paper, we discuss some parts of this trend including holography, imaging application, dispersion control, and multiplexing, mostly operating for optical frequency regime. Finally, we will outlook the future of the devices with recent applications of these metasurfaces.

Section: Discussionmentioning

confidence: 99%

Progresses in the practical metasurface for holography and lens

Sung

2019

Nanophotonics

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“…As components of metasurfaces, plasmonic‐ or high‐index dielectric antennas are exploited to impose abrupt modulation of light through strong light‐matter interaction. By elaborately arranging predesigned antennas, various optical devices such as wave‐plates, optical filters, flat‐lenses, beam deflectors, and holograms are proposed and experimentally demonstrated . However, metasurfaces have a limitation that the functionality is fixed if the information of incident light is not changed or mechanical actuation is not involved .…”

Section: Introductionmentioning

confidence: 99%

Metasurface with Nanostructured Ge₂Sb₂Te₅ as a Platform for Broadband‐Operating Wavefront Switch

Choi

Advanced Optical Materials

Mun

et al. 2019

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Broadband‐operating active devices within a small‐footprint are highly on demand in various nanophotonic fields such as fiber‐optic communication systems and chip‐based integrated optical circuits. As pioneering approaches, diverse platforms of active metasurfaces (AMs) have been proposed due to their superior tunable functionality and ultra‐compact size. However, most of previous researches provide only limited operating bandwidth because they generally rely on resonant light–matter interaction between active material and plasmonic antenna. In this study, an active wavefront switching metasurface that can operate over 500 nm bandwidth at near‐infrared spectral bands is experimentally realized by utilizing nonresonant U‐shaped Ge2Sb2Te5 nanoantennas. Two different sizes of the U‐shaped antenna are designed to exhibit large transmittance contrast and their optical phases are determined by imposing the orientation angle variation. As an example of the functionality, anomalous refraction angle switching and dispersionless active hologram are demonstrated. The devices provide high signal‐to‐noise ratio (>7 dB) for overall operation bandwidth. It is believed that the proposed AMs can be an innovative platform for real device application thanks to their not only broadband and low‐noise operation but also fast speed, low power consumption switching within a small‐footprint.

“…The ability to modulate electromagnetic characteristics in subwavelength scale, especially optical phase or amplitude, insure that metasurfaces are suitable for various applications such as hologram generation, anomalous beam refraction, color generation, and orbital angular momentum generation . They are also being studied for versatile functionalities as a means of replacing bulk optical components such as lens, waveplates, polarizers, diffuser, and retroreflector . Recently, thanks to widespread attention of metamaterials in nanophotonics, the scattering radiation patterns including abovementioned multipolar phase effects are utilized for various optical or physical applications .…”

Section: Introductionmentioning

confidence: 99%

Single‐Layer Bifacial Metasurface: Full‐Space Visible Light Control

Sung

Advanced Optical Materials

Choi

et al. 2019

Self Cite

expansion order. Based on this parity, zero backward scattering is achievable under the condition that electric permittivity and magnetic permeability of the scattering body are equal to each other. [1] This effect is dubbed as Kerker effect, known to be due to destructive interference of the electric and magnetic mode radiation in the reflection space, which stems from various expansion orders of Mie scattering coefficients. [2][3][4][5] Metasurfaces, which indicate planar distribution of periodic or semiperiodic subwavelength scale structures, have been studied in various optical fields thanks to their unprecedented ability to control light properties. The ability to modulate electromagnetic characteristics in subwavelength scale, especially optical phase or amplitude, insure that metasurfaces are suitable for various applications such as hologram generation, [6,7] anomalous beam refraction, [8,9] color generation, [10,11] and orbital angular momentum generation. [12] They are also being studied for versatile functionalities as a means of replacing bulk optical components such as lens, [13,14] waveplates, [15] polarizers, [16,17] diffuser, [18] and retroreflector. [19] Recently, thanks to widespread attention of metamaterials in nanophotonics, the scattering radiation patterns including abovementioned multipolar phase effects are utilized for various optical or physical applications. [3,5,[20][21][22][23] For extended functionalities with respect to radiating pattern and corresponding efficiency to desired direction, generalized Kerker effect is exerting its influence as one of the important methods in the field of metaoptics. For instance, by overlapping ED and MD mode with identical value, Huygens' metasurface is proposed to suppress backward radiation, leading to high transmission efficiency. [24] Further interference of multipole mode radiations also enables directive radiation to reflection space, such as perfect magnetic mirrors as well. [25] By fine-tuning of the phase and amplitude ratio of each multipole mode, polarization-control metasurface, high-order diffraction control, and even directive dispersive device have been implemented so far. [26][27][28] Previously, full-space control has been studied as one of the significant metasurface researches; transmission-reflection integrated bifunctional and trifunctional metasurfaces were demonstrated by multilayered structure which operates in gigahertz range. [29,30] However, this more-than-one function device demands additional degrees of freedom in terms of design, so that the meta-atom should have large dimensions as well as Optical metasurfaces have attracted considerable attention thanks to their unprecedented ability to control the electromagnetic properties of light in subwavelength scale. These metasurface-integrated devices not only have the merit of compact form factor but also exhibit some better performance in comparison with conventional bulk optic devices. In this work, a novel metasurface that enables full-space light control is realized, off...