Ms. Sabiha Latif Profile

Sabiha Latif

at Information Technology Univ Punjab Pakistan

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Publications (2)

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Proceedings Article | 19 December 2022 Presentation + Paper

Independent multichannel wavefront modulation for angle and polarization multiplexing through planar metasurfaces

Sabiha Latif, Nasir Mahmood, Yehia Massoud, Muhammad Qasim Mehmood

Proceedings Volume 12318, 1231808 (2022) https://doi.org/10.1117/12.2644777

KEYWORDS: Multiplexing, Wavefronts, Polarization, Modulation, Refractive index, Information security, Carbon nanotubes, Amorphous silicon, Metamaterials, Holography

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The rapidly growing demand for miniaturized multifunctional devices and systems constantly brings new structural challenges to the research community. The planar metamaterials (metasurfaces) provide a revolutionary way for wavefront manipulation of electromagnetic waves and promise the achievement of superior degrees of freedom. Compared to conventional refractive optical elements, a distinct advantage of metasurfaces can be accomplished by embedding multi-functionality through encoding various sets of information into a single metasurface. Herein, we proposed a unique angle multiplexing strategy that provides wavefront modulation independently in a flat metasurface by controlling the incidence angle of the input light. The fundamental unit cell of the meta-platform of the proposed structure includes a rectangular tetrad with distinct structural geometry. Due to the proposed geometry's geometrical characteristics, the angle multiplexed phenomena are induced in the structure by the mutual coupling of tetrads made of hydrogenated amorphous silicon (a-Si:H). For the proposed metasurface, we exploited the meta-platform comprised of two Meta-atoms, one for positive incidence angle and another for negative incidence angle of light. To increase the applicability of the metasurface, we proposed a single multifunctional meta-device that will project the image of one information for one angle while another information for the opposite angle of the input light. The angle multiplexing phenomena designed for a wavelength can open promising avenues for real-time applications in switchable multifunctional devices, holography, information encryption, and security purposes.

Proceedings Article | 19 December 2022 Presentation + Paper

Polarization-controlled wavefront modulation using all-dielectric multifunctional metasurface in the ultraviolet regime

Sabiha Latif, Nasir Mahmood, Muhammad Qasim Mehmood, Yehia Massoud

Proceedings Volume 12318, 1231806 (2022) https://doi.org/10.1117/12.2644768

KEYWORDS: Ultraviolet radiation, Holograms, Silicon, Wavefronts, Modulation, Holography, Visible radiation, Refractive index, Dielectrics, Carbon nanotubes

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Metasurfaces provide a miniaturized and superficial solution for implementing various nanophotonic devices by exploiting their unprecedented ability to spatially tailor the phase, amplitude, and polarization of the incident light. These meta-devices intriguing significant attention from the research community and have become a prominent hotspot for the realization of state-of-the-art on-chip devices. Various types of information can be encoded independently into a single metasurface, strengthening the cutting-edge technology of nanophotonic for practical applications such as holograms, lenses, beam steering, high-density optical storage, and displays. The integration of metasurfaces and holographic technology makes it the most desirous, but many of the presented techniques lack multifunctional capabilities. Here, we proposed a straightforward strategy for spin manipulation and wavelength multiplexing via geometric phase to overcome the limitations of multifunctionality through anisotropic nanoantennas in the ultraviolet regime. The proposed design methodology provides a superior degree of freedom to increase the multifunctional capabilities of metasurfaces for independent wavefront manipulation. By simultaneously controlling the polarization of the incident and transmitted wave vector, a trifunctional all-dielectric metasurface is implemented. For the proof of concept, we designed a structure that displays two holograms at focal planes. The proposed metasurface features the nanostructured pixels of the silicon nitride material, a lossless, high-refractive index dielectric material that ensures high transmission efficiency in the ultraviolet regime. It is expected that the proposed design strategy can be applied to broaden the horizon for implementing multifunctional nanophotonic devices and multiple optical phenomena

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