Research Outputs

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Department: search.filters.department.Department of Electrical and Electronics EngineeringSubject: search.filters.subject.Photonics

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Now showing 1 - 3 of 3
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    PublicationOpen Access
    Compact and broadband silicon photonic multiplexers based on fast adiabatic structures
    (Optica Publishing Group, 2021) Department of Electrical and Electronics Engineering; Mağden, Emir Salih; Görgülü, Kazım; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; 276368; N/A
    We present the theory and experimental demonstration for compact integrated spectral multiplexers utilizing fast adiabatic structures. The demonstrated 1x2 multiplexers effectively separate/combine broadband long-pass and short-pass signals, with compact footprint and low loss.
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    PublicationMetadata only
    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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    PublicationOpen Access
    Pupil steering holographic display for pre-operative vision screening of cataracts
    (Optica Publishing Group, 2021) Ulusoy, Erdem; Department of Electrical and Electronics Engineering; Kavaklı, Koray; Aydındoğan, Güneş; Kesim, Cem; Hasanreisoğlu, Murat; Şahin, Afsun; Ürey, Hakan; Teaching Faculty; Faculty Member; Faculty Member; Faculty Member; Department of Electrical and Electronics Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Sciences and Engineering; School of Medicine; College of Engineering; Koç University Hospital; N/A; N/A; N/A; 182001; 171267; 8579
    Cataract is the most common cause of preventable blindness and vision loss where the only treatment is surgical replacement of the natural lens with an intraocular lens. Computergenerated holography (CGH) enables to control phase, size, and shape of the light beam entering through the eye-pupil. We developed a holographic vision simulator to assess visual acuity for patients to experience the postoperative corrected vision before going through surgery. A holographically shaped light beam is directed onto the retina using small non-cataractous regions of the lens with the help of a pupil tracker. A Snellen chart hologram is shown to subjects at desired depth with myopia and hyperopia correction. Tests with 13 patients demonstrated substantial improvements in visual acuity and the simulator results are consistent with the post-operative vision tests. Holographic simulator overperforms the existing vision simulators, which are limited to static pinhole exit pupils and incapable of correcting aberrations.