Recent advances in optical dynamic meta-holography

Gao, Hui; Fan, Xuhao; Xiong, Weihao; Hong, Minghui

doi:10.29026/oea.2021.210030

Cited by 141 publications

(64 citation statements)

References 139 publications

(104 reference statements)

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“…On the other side, low-Q antennas represent a true change of paradigm with respect to both guided structures and photonic crystals. Their presently lower SHG efficiency is largely counterbalanced by intriguing possibilities ranging from the dynamic tunability of individual meta-atom emission 82,155,157,158 , pulse shaping 159 , broadband parametric devices 96 , nonlinear imaging 107 , wavefront shaping 108 and meta-holography 112,160,161 . Their rapid development is currently underpinned by an ongoing progress in nanofabrication, new promising nonlinear materials like TMDCs, and both analytical 69,162 and numerical 67 methods to model nonlinear generation in leaky cavities.…”

Section: Discussionmentioning

confidence: 99%

All-dielectric χ<sup>(2)</sup> metasurfaces: recent progress

Gigli¹,

Leo²

2022

OEA

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Optical metasurfaces, i.e. arrays of nanoantennas with sub-wavelength size and separation, enable the manipulation of light-matter interactions in miniaturized optical components with no classical counterparts. Six decades after the first observation of the second harmonic generation (SHG) in bulk crystals, these devices are expected to break new ground in the field of nonlinear optics, shifting the focus from the phase matching approach achieved within long propagation distances to that of near-field resonances interplay in leaky nanocavities. Here we review the recent progress in SHG with all-dielectric metasurfaces. We discuss the most used technological platforms which underpinned such advances and analyze different SHG control approaches. We finally compare their performances with other well-established technologies, with the hope to delineate the current state-of-the-art and figure out a few scenarios in which these devices might soon offer unprecedented opportunities.

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Section: Discussionmentioning

confidence: 99%

All-dielectric χ<sup>(2)</sup> metasurfaces: recent progress

Gigli¹,

Leo²

2022

OEA

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“…They significantly relax the requirement of the complicated fabrication process and possess many attractive features such as lower loss, lighter weight, and a higher degree of integration. [1][2][3] With properly tailoring and arranging the unit cells of the metasurfaces, many novel planar devices have been created from optical to microwave wavelengths, including polarization conversion, [4] achromatic focusing lenses, [5,6] spin and orbital angular momentum, [7,8] high gain antennas, [9,10] holograms, [11,12] vortex beam generators, [13,14] microwave absorbers, [15,16] and so on.…”

Section: Doi: 101002/adom202102111mentioning

confidence: 99%

Transmission–Reflection‐Integrated Quadratic Phase Metasurface for Multifunctional Electromagnetic Manipulation in Full Space

Wang

Zhang

Huang

et al. 2022

Advanced Optical Materials

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Metasurface has shown significant advantages in full‐space multifunctional electromagnetic (EM) manipulation due to its strong design capability. Here, a novel transmission–reflection‐integrated metasurface is proposed, which can simultaneously manipulate beam direction and polarization states. Through ingenious design based on the quadratic phase distribution, such a metasurface can dynamically control the beam deflection direction in both transmission and reflection modes by shifting the position of the feeding source. In addition, arbitrarily polarized EM waves can be generated based on the dual‐beam coherent interference method. The above EM functions are experimentally demonstrated at microwave frequencies. The wide‐angle beam steering performance is realized in full space, and its scanning range is beyond ±60°. More remarkably, the deflecting beam with different polarization states can be obtained by simultaneously illuminating the metasurface from the reflection and transmission sides with a specific phase difference. The measured results are in excellent accordance with the numerically simulated results, thus verifying the EM manipulation capability of the metasurface. The proposed design provides a new approach to achieve multifunctional beam manipulation in full space, which holds great promise in integrated optics, radar detection, and wireless communication.

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“…However, because metasurfaces with discontinuous phase distributions are not sensitive to changes in ambient refractive index, most metadevices are static and have a single function. A dynamically tunable metasurface is more flexible and can further expand the application of metasurface functional devices [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Beam Switching by the Highly Sensitive Metasurface Composed of All‐Metallic Split‐Ring Resonators

Gan

et al. 2022

Journal of Nanomaterials

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The development of metasurfaces capable of arbitrarily manipulating electromagnetic waves has created new opportunities for various applications. However, most tunable metasurface devices via different modulation techniques exhibit large fabrication difficulties or narrow bandwidths. Here, we use the all-metallic split-ring resonator to design a dynamically tunable metasurface that is highly sensitive to the ambient refractive index and capable of broadband beam switching. Different from the previous optical scatters, the split-ring resonator is put on the metal substrate. Due to the existence of metallic substrate and large interaction of corner modes, the proposed resonator has small ohmic loss and high sensitivity to the ambient refractive index. By arraying the all-metallic split-ring resonators with different parameters, dynamic beam switching of anomalous reflection is demonstrated numerically. In particularly, the designed metasurface exhibits the dynamic beam switching in a broadband wavelength range of Δλ≈100 nm. Such an all-metallic metasurface with high sensitivity can greatly reduce the designing difficulty of the tunable optical devices. The dynamic metadevices may find potential applications in stealth camouflage, information encryption, and data storage.

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Recent advances in optical dynamic meta-holography

Cited by 141 publications

References 139 publications

All-dielectric χ<sup>(2)</sup> metasurfaces: recent progress

All-dielectric χ<sup>(2)</sup> metasurfaces: recent progress

Transmission–Reflection‐Integrated Quadratic Phase Metasurface for Multifunctional Electromagnetic Manipulation in Full Space

Dynamic Beam Switching by the Highly Sensitive Metasurface Composed of All‐Metallic Split‐Ring Resonators

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