Dielectric chiral metasurfaces for enhanced circular dichroism spectroscopy at near infrared regime

Ali, Asif; Khaliq, Hafiz Saad; Asad, Aqsa; Akbar, Jehan; Zubair, Muhammad; Mehmood, Muhammad Qasim; Massoud, Yehia

doi:10.1039/d3ra02331a

Cited by 9 publications

(6 citation statements)

References 48 publications

(68 reference statements)

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“…The chiral designs may be extrinsic or intrinsic, exhibiting optical activity or circular dichroism, defined as the rotation of the polarization plane or difference of optical output for two differently polarized lights. Strong chiro-optical responses have been found for various structures such as L-shaped [16], g-shaped [19], X-shaped, Zshaped [20], spiral-shaped, gammadion-shaped [21], helices [22], twisted arcs [23] and semicircles [24], as shown in Figure 1. The chiral objects are optically characterized by birefringence (optical activity) and circular dichroism (CD) [25], meaning one of the polarizations is perfectly absorbed.…”

Section: Chirality and Chiral Metasurfacesmentioning

confidence: 94%

“…(A) L-shaped diatomic meta-atom with working principle and its design strategy. Source: Ali et al [16], (B) Z-shaped chiral transmission metasurface (reprinted with permission from [20], © The Optical Society) (C) G-shaped THz chiral design (reprinted with permission from [19], © The Optical Society), (D) the chiral metasurface absorber of twisted connected semicircles [24] open access Creative Commons license, (E) perovskite chiral metamolecule on quartz substrate with circular dichroism of gammadion shape [26], (F) A double-layer twisted metal helices. Source: licensed under a Creative Commons Attribution 4.0 International License [27].…”

Section: Chirality and Chiral Metasurfacesmentioning

confidence: 99%

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An introduction of perovskite materials in chiral metasurfaces

Ijaz,

Khan,

Massoud

2023

Optoelectronic Devices and Integration XII

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Nature has implanted chirality in many organic molecules of living organisms that have made man think about exploiting this handedness property of the objects and coming up with exciting applications through synthetic chiral structures. In this connection, several chiral metasurface designs have been proposed with interesting optoelectronic applications, such as chiral sensing of a molecule at the zeptomole level, circularly polarized luminescence, circular dichroism, chiro-spintronics, and nonlinear optics. The perovskites' unique chirality features have led to the emerging perovskite optoelectronic area. In this regard, exploiting the novel chiral perovskite materials for optoelectronic functionalities becomes vitally important. This area of research is at a pre-mature stage. The present issues associated with perovskite semiconductors are toxicity, reproducibility, and instability. However, the expertise from physics, chemistry, and device engineering from the perovskite research community has been focusing on the basic material properties, fabrication, and characterization methods while simultaneously mitigating the present issues to get to successful commercialization. Future research opportunities related to chiral perovskite nanocrystals are versatile and intend to rationalize the exceptional potential of these low-cost materials for complicated optoelectronics applications.

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Section: Chirality and Chiral Metasurfacesmentioning

confidence: 94%

Section: Chirality and Chiral Metasurfacesmentioning

confidence: 99%

An introduction of perovskite materials in chiral metasurfaces

Ijaz,

Khan,

Massoud

2023

Optoelectronic Devices and Integration XII

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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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“…[1][2][3][4][5][6][7][8][9][10][11] This degree of flexibility makes metalenses preferable to typical refractive optical devices and brings up novel possibilities in many applications that need unique manipulation of light. 6,[12][13][14] Metalenses have shown potential in several industries through their flat and compact nature. Although achromatic focusing and wide-angle vision pose a difficulty in imaging uses using metalenses.…”

Section: Introductionmentioning

confidence: 99%

Broadband multifunctional achromatic metalens

Javed,

Javed Satti,

Naveed

et al. 2023

Nanophotonics and Micro/Nano Optics IX

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Metasurfaces offer novel design capability of optical wavefront shaping to realize ultra-compact flat optical components which have remarkable potential to mitigate the constraints of size and design complexities in imaging systems. However, aberration correction and diffraction-limited response over the broad spectrum greatly hindered their applicability because of simultaneous phase engineering at multiple wavelengths on a single metasurface interface. Conventionally reported design methodologies overcome the challenges mentioned earlier by exploiting resonance tuning, layer stacking, and phase mergence strategies. They suppressed the aberration effect with high efficiency but have complex design and meta-atom geometry with limited functionalities. Here in this research script, we have introduced broadband achromatic bifocal metalens based on a single-layer array of nano-rectangular bars in transmission mode. In order to have wavelength-independent focusing, we developed a library of meta-atoms to provide required phase compensations. In addition to this, a novel material zinc selenide (ZnSe) is introduced as a constituent which is a large transparent window in the optical regime. The high efficiency and unprecedented capability of aberration correction along with multi-functionality make the proposed metalens a potential candidate for next-generation advanced imaging technology.

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Dielectric chiral metasurfaces for enhanced circular dichroism spectroscopy at near infrared regime

Abstract: A dielectric chiral meta-nano-surface based on a diatomic design strategy is demonstrated to comprehend giant chirality in the NIR regime for potential application in CD spectroscopy, and enantiomer separation and detection.

Cited by 9 publications

References 48 publications

An introduction of perovskite materials in chiral metasurfaces

An introduction of perovskite materials in chiral metasurfaces

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

Broadband multifunctional achromatic metalens

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