Optimization and applications of planar silicon-based photonic crystal devices

Peter Ingo Borel (Invited author), Lars Hagedorn Frandsen (Invited author), Juan Burgos Leon (Invited author), Tapio Niemi (Invited author), Andrei Lavrinenko (Invited author)

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Very low propagation losses in straight planar photonic crystal waveguides have previously been reported. A next natural step is to add functionality to the photonic crystal waveguides and create ultra compact optical components. We have designed and fabricated such structures in a silicon-on-insulator material. The photonic crystal is defined by holes with diameter 250 nm arranged in a triangular lattice having lattice constant 400 nm. Leaving out single rows of holes creates the planar photonic crystal waveguides. Different types of couplers and splitters, aswell as 60. 90 and 120 degree bends have been realized. We have designed and fabricated components displaying more than 200 nm of useful bandwidth around 1550 nm. Design strategies to enhance the performance include systematic variation of design parameters using finite-difference time-domain simulations and inverse design methods such as topology optimization. We have also investigated a new device concept for coarse wavelength division de-multiplexing based on planar photonic crystal waveguides. The filtering of the wavelength channels has been realized by shifting the cut-off frequency of the fundamental photonic band gap mode in consecutive sections of the waveguide. Preliminary investigations show that this concepts allows coarse de-multiplexing to take place, but that optimization is required in order to reduce cross talk between adjacent channels and to increase the overall transmission. In this work the design, fabrication and performance of these planar photonic crystal waveguide components are reviewed and discussed.
    Original languageEnglish
    Title of host publicationProceedings of SPIE
    EditorsAchyut K. Dutta, Yasutake Ohishi, Niloy K. Dutta, Jesper Mørk
    Publication date2005
    ISBN (Print)0-8194-6038-9
    Publication statusPublished - 2005
    EventOptics East: Active and Passive Optical Components for WDM Communications V - Boston, MA, United States
    Duration: 1 Oct 20064 Oct 2006


    ConferenceOptics East
    Country/TerritoryUnited States
    CityBoston, MA
    Internet address


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