A highly efficient broadband multi-functional metaplate

Satti, Azhar Javed; Naveed, Muhammad; Javed, Isma; Mahmood, Nasir; Zubair, Muhammad; Mehmood, Muhammad Qasim; Massoud, Yehia

doi:10.1039/d2na00953f

Cited by 22 publications

(17 citation statements)

References 42 publications

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“…In comparison with the traditional bulk metamaterials [4]- [6], metasurfaces have successfully enabled the engineering of electromagnetic waves by manipulating phase, amplitude, and polarization through a compact and easily fabricated system, providing great freedom in influencing light-matter interactions at the sub-wavelength scale [7]- [9]. Such promising approaches have proven their feasibility in numerous applications, from basic devices of holograms [10]- [14], electromagnetic absorbers [15]- [18], polarizers [19], radars, and communications to more complex systems of information encryption [20], [21], signal processing [22], safety and security [23]- [25], and intelligent recognition [26]- [29]. Recently, deep learning and machine learning techniques have changed the mode of realization of metasurfaces by decreasing the numerical computation and saving ample of time [30]- [34].…”

Section: Introductionmentioning

confidence: 99%

Eradicating backscattering through circular conversion dichroism in optical regime

Sarwar Rana,

Ijaz,

Atif Khan

et al. 2023

Advanced Optical Imaging Technologies VI

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Circular dichroism (CD) and asymmetric transmission (AT) are two outstanding chiroptical effects, which can be produced by planar chiral devices due to their distinct response to oppositely handed input light. The chiroptical effects have so far been used in realization of different applications including chiral imaging and sensing. This research realizes CD in the optical regime to attain AT for an optical wavelength regime by employing a supercell of hydrogenated amorphous Silicon nano-bars. The supercell is made of four achiral nanofins which are engineered in such a way that they exhibit a notable CD and AT. The design successfully achieves a CD of 55% and that of AT of 58% at the operating wavelength of 633 nm. The supercell absorbs the right circularly polarized light and transmits left circularly polarized light, thus behaving as a perfect circular polarization wave isolator i.e. the presented design can completely eradicate backscattering by minimizing reflectance.

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Section: Introductionmentioning

confidence: 99%

Eradicating backscattering through circular conversion dichroism in optical regime

Sarwar Rana,

Ijaz,

Atif Khan

et al. 2023

Advanced Optical Imaging Technologies VI

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“…Metasurfaces, which are planar structures possessing elements smaller than the operating wavelength, have shown an extraordinary capacity to influence the fundamental characteristics of incident electromagnetic (EM) waves at subwavelength scales. [1][2][3][4][5][6][7][8][9][10][11][12] One of the key strategies is the simultaneous change of phase and amplitude of incoming EM waves. [13][14][15][16][17][18] Amongst numerious interesting applications like meta-absorber, [19][20][21][22][23][24] reconfigurable surfaces, ?, 25-28 vortax beam generation, [29][30][31] holography 32,33 is one of the most attractive application.…”

Section: Introductionmentioning

confidence: 99%

Spin-encoded multifunctional meta-holographic display

Javed Satti,

Javed,

Naveed

et al. 2023

Holography, Diffractive Optics, and Applications XIII

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Multi-operational metasurfaces have received a lot of interest because of their significant design improvements for ultra-compact and highly integrated meta-optics. The emergence of near and far-field holography offers an effective solution to enhance the capacity of information encoding in a single metasurface. However, the existing strategies of layer stacking and interleaving, where distinct functionalities are embedded with the help of the combination of multiple meta-atoms, have challenges in terms of design complexity and efficiency. This manuscript proposes a new simplest approach for a tri-channel highly efficient meta-holography based on the photonics spin Hall Effect (PSHE) and Mauls’ Principle of amplitude manipulation. A multi-functional metasurface constituent of a single nano-rectangular pillar over a glass substrate is designed as evidence of conception to highlight the feasibility of parallel manipulation upon near and far-field activities. To achieve control over the entire phase range (0-2π), geometric phase modulation is utilized. Zinc sulphide (ZnS) is used as a constituent material for highly efficient broadband response over the whole visible spectrum due to its characteristics of an extraordinary refractive index and low absorption coefficient. For authentication of the proposed methodology, the designed metasurface is simulated in FDTD, effectively validating the execution of a multi-functional design scheme. For the proof of the broadband operation, optical response over three visible wavelengths (i.e., blue, green, and red) is measured, and it reconstructs all three holograms with high efficiency. Thus, the proposed optical response multiplication approach is a viable contender for various high-end applications in photonics, data storage, and communication.

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“…Recently, the realm of metasurfaces has risen as an up-and-coming contender for producing captivating optical phenomena, notably including PV beams [13]- [18]. Currently, metasurfaces have come into light as highly promising contenders for a multitude of applications, such as flat lenses [19]- [21], meta-holograms [22]- [28], multifunctional meta-devices [29]- [32], liquid crystal-based devices [33]- [35], structured light generation [36]- [38], circular dichroism spectroscopy [39]- [42] metaabsorbers [43]- [45], and intelligent surfaces [46]- [50].…”

Section: Introductionmentioning

confidence: 99%

Broadband all-dielectric meta-devices for visible perfect vortex beams generation

Shafqat,

Mahmood,

Massoud

2023

Holography, Diffractive Optics, and Applications XIII

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Conventional optical elements are typically designed for a specific wavelength and have limited functionality, hindering their practical applications and integration with on-chip devices. Recently developed artificially engineered structures overcome this constraint but at the cost of added design complexity. Here, we present broadband single-layered metadevices capable of integrating multiple functionalities that generate nondiffracting perfect vortex beams for visible wavelengths (475 to 650 nm). To realize highly efficient all-dielectric meta-devices, zinc sulfide material is exploited due to its large transparent window with a sufficiently high refractive index in the visible regime. The nondiffracting response provides a significantly long propagation distance without abrupt divergence. Moreover, shorter optical wavelengths provide more data bandwidth when mixed with a high topological charge (𝑛 = 8) of the perfect vortex beam, which paved the path towards the realization of numerous applications such as optical tweezing, quantum information processing, and optical communication.

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A highly efficient broadband multi-functional metaplate

Abstract: Due to the considerable potential of ultra-compact and highly integrated meta-optics, multi-functional metasurfaces have attracted great attention.

Cited by 22 publications

References 42 publications

Eradicating backscattering through circular conversion dichroism in optical regime

Eradicating backscattering through circular conversion dichroism in optical regime

Spin-encoded multifunctional meta-holographic display

Broadband all-dielectric meta-devices for visible perfect vortex beams generation

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