Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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Publisher: search.filters.publisher.Elsevier Ltd.Subject: search.filters.subject.Direct-writing

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  • Article
    A Fiber-Integrated Optical Component Fabricated Via Photopolymerization: Mode-Selective Grating Coupler
    (Elsevier Ltd., 2013) Sümer, Can; Dinleyici, Mehmet Salih
    We demonstrate a mode-selective directional coupler based on a grating structure, which is fabricated by laser direct-writing on a photopolymer thin film. The device is implemented on the flat planar surface of the D-Fiber, enabling fiber integration, where an Acrylamide/Polyvinyl Alcohol based photopolymer material is used in the fabrication of the device. While the refractive index modulation properties of the polymer material are well known, surface relief and corrugation properties due to photopolymerization are investigated in this study. Theoretical model of the device is presented together with the optimization and simulation results of the final device; experimental results have been found to be in good agreement with simulations.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 8
    Characterization and Estimation of Refractive Index Profile of Laser-Written Photopolymer Optical Waveguides
    (Elsevier Ltd., 2011) Dinleyici, Mehmet Salih; Sümer, Can
    In this study, channel waveguides fabricated in photopolymer films by direct-writing using a low-power CW laser, are used as phase objects in a simple plane-wave diffraction setup, and the refractive index modulation profiles of the waveguides are characterized using the recorded diffraction patterns. Index profiles are modeled by piece-wisely combining two Gaussian functions representing the central and the tail regions. Measured diffraction patterns are matched with patterns generated using the model. This simple model makes it possible to design various channel waveguides embedded into polymer substrates. The proposed model is tested on three distinctive waveguide profiles written on the same Acrylamide/Polyvinyl Alcohol based photopolymer with different exposures.