Aima Zahid - Academia.edu (original) (raw)
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Papers by Aima Zahid
Nanophotonics, Micro/Nano Optics, and Plasmonics VIII
2020 17th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 2020
Optical devices require simultaneous control over wavefront and polarization of light to achieve ... more Optical devices require simultaneous control over wavefront and polarization of light to achieve various phenomena such as asymmetric transmission, reflection, and selective absorption. Traditionally, cascaded bulk components were used in these systems, which worked by manipulating the propagation phase of the incident light. These large components made the system impossible to miniaturize, which led to an interest in compact optical systems and the search for novel materials which would enable the system to exhibit the same phase-dictated phenomena through wavefront shaping. Here, we present a single-layered all-dielectric metasurface structure with nano-resonators which engineer the wavefront to achieve asymmetric transmission of circularly polarized light. A mathematical analysis of the phenomena is done using Jones Calculus. Finite Difference Time Domain (FDTD) Solutions is then used to optimize the structure hence achieving a 76% Asymmetric Transmission Parameter.
Photonics Research, 2021
Chiro-optical effects offer a wide range of potential applications in nanophotonics, such as adva... more Chiro-optical effects offer a wide range of potential applications in nanophotonics, such as advanced imaging and molecular sensing and separation. Flat single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light–matter interactions. Although metasurface-based devices have manipulated electromagnetic waves, the compact on-chip realization of giant chiro-optical effects remains a challenge at optical frequencies. In this work, we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible regime. Notably, the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design freedom. The mutual coupling between carefully engineered nanofins produces constructive and destructive interference, leading to the asymmetric transmission of 70% and average circular dichroism exceedin...
Nanophotonics, Micro/Nano Optics, and Plasmonics VIII
2020 17th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 2020
Optical devices require simultaneous control over wavefront and polarization of light to achieve ... more Optical devices require simultaneous control over wavefront and polarization of light to achieve various phenomena such as asymmetric transmission, reflection, and selective absorption. Traditionally, cascaded bulk components were used in these systems, which worked by manipulating the propagation phase of the incident light. These large components made the system impossible to miniaturize, which led to an interest in compact optical systems and the search for novel materials which would enable the system to exhibit the same phase-dictated phenomena through wavefront shaping. Here, we present a single-layered all-dielectric metasurface structure with nano-resonators which engineer the wavefront to achieve asymmetric transmission of circularly polarized light. A mathematical analysis of the phenomena is done using Jones Calculus. Finite Difference Time Domain (FDTD) Solutions is then used to optimize the structure hence achieving a 76% Asymmetric Transmission Parameter.
Photonics Research, 2021
Chiro-optical effects offer a wide range of potential applications in nanophotonics, such as adva... more Chiro-optical effects offer a wide range of potential applications in nanophotonics, such as advanced imaging and molecular sensing and separation. Flat single-layer metasurfaces composed of subwavelength meta-atoms have gained significant attention due to their exceptional characteristics in light–matter interactions. Although metasurface-based devices have manipulated electromagnetic waves, the compact on-chip realization of giant chiro-optical effects remains a challenge at optical frequencies. In this work, we experimentally and numerically demonstrate an all-dielectric metasurface to realize large chiro-optical effects in the visible regime. Notably, the proposed strategy of utilizing achiral nanofins instead of conventional chiral structures provides an extra degree of design freedom. The mutual coupling between carefully engineered nanofins produces constructive and destructive interference, leading to the asymmetric transmission of 70% and average circular dichroism exceedin...