Engineering tunability through electro-optic effects to manifest a multifunctional metadevice

Naeem, Taimoor; Khaliq, Hafiz Saad; Zubair, Muhammad; Tauqeer, Tauseef; Mehmood, Muhammad Qasim

doi:10.1039/d1ra00901j

Cited by 22 publications

(28 citation statements)

References 50 publications

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“…A design of meta-holography consists of silicon nitride nanopillars with a high-speed dynamically structured laser beam modulation module, which achieved two different holographic frames at a high frame rate of 9523 frames per second in the visible range . Various metasurface designs have demonstrated a multichannel holographic image display. , However, these are still passive technologies, and the optical characterization is fixed once they are manufactured. Two conceivable approaches for active metasurface hologram display based on the LC platform showed the real-time holographic images. , Figure h shows the schematic illustrations for the LC-integrated metasurfaces .…”

Section: Applicationsmentioning

confidence: 99%

“…335 Various metasurface designs have demonstrated a multichannel holographic image display. 336,337 However, these are still passive technologies, and the optical characterization is fixed once they are manufactured. Two conceivable approaches for active metasurface hologram display based on the LC platform showed the real-time holographic images.…”

Section: Applicationsmentioning

confidence: 99%

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Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications

et al. 2022

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Metasurfaces, a two-dimensional (2D) form of metamaterials constituted by planar meta-atoms, exhibit exotic abilities to tailor electromagnetic (EM) waves freely. Over the past decade, tremendous efforts have been made to develop various active materials and incorporate them into functional devices for practical applications, pushing the research of tunable metasurfaces to the forefront of nanophotonics. Those active materials include phase change materials (PCMs), semiconductors, transparent conducting oxides (TCOs), ferroelectrics, liquid crystals (LCs), atomically thin material, etc., and enable intriguing performances such as fast switching speed, large modulation depth, ultracompactness, and significant contrast of optical properties under external stimuli. Integration of such materials offers substantial tunability to the conventional passive nanophotonic platforms. Tunable metasurfaces with multifunctionalities triggered by various external stimuli bring in rich degrees of freedom in terms of material choices and device designs to dynamically manipulate and control EM waves on demand. This field has recently flourished with the burgeoning development of physics and design methodologies, particularly those assisted by the emerging machine learning (ML) algorithms. This review outlines recent advances in tunable metasurfaces in terms of the active materials and tuning mechanisms, design methodologies, and practical applications. We conclude this review paper by providing future perspectives in this vibrant and fast-growing research field.

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Section: Applicationsmentioning

confidence: 99%

Section: Applicationsmentioning

confidence: 99%

Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications

et al. 2022

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“…[ 4–12 ] Such exceptional abilities lead to the development of planar meta‐devices that are compact compared to conventional optical platforms for diverse functionalities, particularly metaholography, [ 13–30 ] metalenses, [ 31–35 ] meta‐reflect arrays, [ 21 ] and light‐structuring. [ 22,35–40 ]…”

Section: Introductionmentioning

confidence: 99%

“…To subjugate these limitations, the research trend in nanotechnology shifted toward dielectric‐based meta‐devices. [ 36–40 ] The meta‐devices based on dielectrics have low loss and high refractive index nano‐structures to provide simultaneous control of APP due to the simultaneous excitation of electric and magnetic Mie‐type dipolar resonances. [ 52 ]…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9][10][11][12] Such exceptional abilities lead to the development of planar meta-devices that are compact compared to conventional optical platforms for diverse functionalities, particularly metaholography, [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] metalenses, [31][32][33][34][35] meta-reflect arrays, [21] and light-structuring. [22,[35][36][37][38][39][40] Meanwhile, the inclusion of chirality and the complete control of APP using metasurfaces has opened a new path toward the generation of chiro-optical effects for numerous applications in AR and the VR for futuristic holographic displays, [41] chiral imaging, [42] sensing, [43] separation of pesticides and pharmaceuticals, [44,45] circular dichroism (CD) spectroscopy, [46] and ...…”

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confidence: 99%

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Broadband Chiro‐Optical Effects for Futuristic Meta‐Holographic Displays

Khaliq

Kim

Naeem

et al. 2022

Advanced Optical Materials

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Futuristic holographic displays will essentially require broadband chiro‐optical effects for medical imaging, virtual reality, smart security, and optical encryption. However, conventional metasurfaces cannot provide such on‐chip realization of broadband chiro‐optical effects. Moreover, the simultaneous conversion of amplitude, polarization, and phase (APP) at optical wavelengths to introduce giant chirality has not been realized yet. In this paper, a planar all‐dielectric metasurface is proposed incorporating extra degrees of freedom to comprehend the conversion of APP with broadband chiro‐optical effects in terms of giant asymmetric transmission with maximum efficiency of ≈77% at the wavelength of 567 nm. The underlying mechanism behind induced chiro‐optical effects is also investigated using higher‐order multipolar dielectric resonances. Moreover, experimental validation is performed using the reproduced polarization‐encrypted meta‐holograms at broadband visible wavelengths. This work expands the scope of meta‐nanophotonics with potential applications in bioimaging and polarization‐encrypted displays for healthcare and smart security applications.

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Wide‐Angled Pragmatic Dielectric Chiral Meta‐Platform for Spin‐ and Wavelength‐Multiplexed Holography in the Ultraviolet and Visible

Asad,

Seong,

Khaliq

et al. 2024

Adv Funct Materials

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A chiral meta‐optics platform that incorporates hologram‐multiplexing with low phase distortion and wide‐incident angle tolerance over the broad spectral range of the ultraviolet‐visible (UV–vis) regimes holds great potential for photonic‐encryption‐based applications, particularly in next‐generation 3D displays, high‐resolution biomedical imaging, holographic anti‐counterfeiting labeling, and multi‐channel optical communication. However, the design incorporating giant chirality from UV–vis wavelengths coupled with wide‐incident‐angle tolerance and cost‐effective fabrication is still challenging. Here, the study introduces a pragmatic multifunctional dielectric chiral meta‐platform designed for simultaneous spin‐ and wavelength‐multiplexing of optical information in the UV–vis spectrum. The unit cell comprises a dimer structure based on wide‐bandgap silicon nitride (SiNx), ensuring substantial dual‐spectrum chiro‐optical effects. The meticulously engineered chiral meta‐platform offers an incident angle tolerance of up to 40 degrees, coupled with significant chiro‐optical transmission. To demonstrate the concept, two distinct phase profiles are embedded in the meta‐platform, utilizing the spin and wavelength of incident light as keys to unlock the specific holographic information. The chiral meta‐platform is experimentally validated for oblique illumination angles, showcasing its adaptability across the UV–vis spectrum. The demonstrated meta‐device with dual‐spectrum visual encryption can be applied in various anti‐counterfeiting and security applications.

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Engineering tunability through electro-optic effects to manifest a multifunctional metadevice

Abstract: Engineering tunability through electro-optic effects, which demonstrates a multifunctional metadevice by controlling resonance wavelength tuning and zoom focusing.

Cited by 22 publications

References 50 publications

Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications

Recent Advances in Tunable Metasurfaces: Materials, Design, and Applications

Broadband Chiro‐Optical Effects for Futuristic Meta‐Holographic Displays

Wide‐Angled Pragmatic Dielectric Chiral Meta‐Platform for Spin‐ and Wavelength‐Multiplexed Holography in the Ultraviolet and Visible

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