• About
  • Policies
  • What is open access
  • Library
  • Contact
Advanced search
      View Item 
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      •   BUIR Home
      • Scholarly Publications
      • Faculty of Science
      • Department of Physics
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.

      Optical waveguides written deep inside silicon by femtosecond laser

      Thumbnail
      View / Download
      707.3 Kb
      Author(s)
      Pavlov, Ihor
      Tokel, Onur
      Pavlova, S.
      Kadan, V.
      Makey, Ghaith
      Turnalı, Ahmet
      Çolakoğlu, T.
      Yavuz, O.
      İlday, Fatih Ömer
      Date
      2017
      Source Title
      Proceedings of the European Conference on Lasers and Electro-Optics and the European Quantum Electronics Conference, CLEO/Europe - EQEC 2017
      Publisher
      OSA
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
      204
      views
      193
      downloads
      Abstract
      Summary form only given. Photonic devices that can guide, transfer or modulate light are highly desired in electronics and integrated silicon photonics. Through the nonlinear processes taking place during ultrafast laser-material interaction, laser light can impart permanent refractive index change in the bulk of materials, and thus enables the fabrication of different optical elements inside the material. However, due to strong multi-photon absorption of Si resulting delocalization of the light by free carriers induced plasma defocusing, the subsurface Si modification with femtosecond laser was not realized so far [1, 2]. Here, we demonstrate optical waveguides written deep inside silicon with a 1.5-μm high repetition rate femtosecond laser. Due to pulse-to-pulse heat accumulation for high repetition rate laser, additional thermal lensing prevents delocalization of the light around focal point, allowing the modification. The laser with 2-μJ pulse energy, 350-fs pulse width, operating at 250 kHz focused in Si produces permanent modifications. The position of the focal point inside of the sample is accurately controlled with pumpprobe imaging during processing. Optical waveguides of ~20-μm diameter, and up to 5.5-mm elongation are fabricated by translating the beam focal position along the optical axis. The waveguides are characterized with a 1.5-μm continuous-wave laser, through optical shadow-graphy (Fig. 1 a-b, e) and direct light coupling (Fig.1 c-d, f). The measured refractive index change obtained by quantitative shadow-graphy is ~6×10 -4 . The numerical aperture of the waveguide measured from decoupled light is 0.05.
      Keywords
      Ultrafast optics
      Optical waveguides
      Waveguide lasers
      Optical device fabrication
      Optical imaging
      Optical pumping
      Permalink
      http://hdl.handle.net/11693/37680
      Published Version (Please cite this version)
      https://doi.org/10.1109/CLEOE-EQEC.2017.8087237
      Collections
      • Department of Electrical and Electronics Engineering 3863
      • Department of Physics 2485
      Show full item record

      Related items

      Showing items related by title, author, creator and subject.

      • Thumbnail

        Dimensioning shared-per-node recirculating fiber delay line buffers in an optical packet switch 

        Akar, N.; Gunalay, Y. (Elsevier, 2013)
        Optical buffering based on fiber delay lines (FDLs) has been proposed as a means for contention resolution in an optical packet switch. In this article, we propose a queuing model for feedback-type shared-per-node recirculating ...
      • Thumbnail

        Engineering particle trajectories in microfluidic flows using speckle light fields 

        Volpe, G.; Volpe, Giovanni; Gigan, S. (SPIE, 2014)
        Optical tweezers have been widely used in physics, chemistry and biology to manipulate and trap microscopic and nanoscopic objects. Current optical trapping techniques rely on carefully engineered setups to manipulate ...
      • Thumbnail

        An optical microcantilever with integrated grating coupler 

        Olcum, Selim; Karademir, Ertuğrul; Taş. Vahdettin; Akça, İmran; Kocabaş, Aşkın; Atalar, Abdullah; Aydınlı, Aydınlı (IEEE, 2009-06)
        In this paper, we have fabricated an optical cantilever with an integrated grating coupler. We have used an inexpensive and repeatable method for integrating the grating to the silicon cantilever with a microfabrication ...

      Browse

      All of BUIRCommunities & CollectionsTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsCoursesThis CollectionTitlesAuthorsAdvisorsBy Issue DateKeywordsTypeDepartmentsCourses

      My Account

      Login

      Statistics

      View Usage StatisticsView Google Analytics Statistics

      Bilkent University

      If you have trouble accessing this page and need to request an alternate format, contact the site administrator. Phone: (312) 290 2976
      © Bilkent University - Library IT

      Contact Us | Send Feedback | Off-Campus Access | Admin | Privacy