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    Exactness of the first born approximation in electromagnetic scattering
    (Oxford Univ Press Inc, 2024) Loran, Farhang; Department of Mathematics; Mostafazadeh, Ali; Department of Mathematics; College of Sciences
    For the scattering of plane electromagnetic waves by a general possibly anisotropic stationary linear medium in three dimensions, we give a condition on the permittivity and permeability tensors of the medium under which the first Born approximation yields the exact expression for the scattered wave whenever the incident wavenumber k does not exceed a preassigned value alpha. We also show that under this condition the medium is omnidirectionally invisible for k <= alpha/2, i.e. it displays broadband invisibility regardless of the polarization of the incident wave.
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    Multi-scale hierarchical topology optimization for nanophotonic design
    (Optica Publishing Group (formerly OSA), 2020) Kiraz, Berna; Department of Physics; Department of Electrical and Electronics Engineering; N/A; N/A; Kiraz, Alper; Mağden, Emir Salih; Daşdemir, Ahmet Onur; Koral, Ahmet Kağan; Faculty Member; Faculty Member; Master Student; Master Student; Department of Physics; Department of Electrical and Electronics Engineering; College of Sciences; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 22542; 276368; N/A; N/A
    We develop a multi-scale method to rapidly design efficient and fabrication-compatible nanophotonic devices, and demonstrate it by designing a mode multiplexer with 98.1% efficiency in 104 iterations under 50 seconds using 16 cores.
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    Photonic materials, architecture, science, and engineering
    (IEEE-Inst Electrical Electronics Engineers Inc, 2023)  ; Department of Physics; Serpengüzel, Ali; Department of Physics;  ; College of Sciences;  
    We review the necessary artistic and scientific fields for the development of any scientific discipline in the history, as well as, in any healthy and contemporary economy. Our case study is photonics, a subfield of electromagnetics, which is undergoing a historical transition from integrated classical photonics to integrated quantum photonics with applications in communication and computation. © 2023 IEEE.