Silicon optical filter with transmission peaks in wide stopband obtained by anti-symmetric photonic crystal with defect in multimode waveguides

Manuel Mendez Astudillo, Hideaki Okayama, Hirochika Nakajima

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    We experimentally demonstrate and characterize a wide optical stopband filter with transmission peaks constituted by two parallel rows of an anti-symmetric one-dimensional (1D) photonic crystal with defect in a multimode waveguide. The working principle is based on mode coupling for the wavelengths that meet the phase matching condition as the fundamental mode is coupled to a higher-order mode and then filtered out with linear tapers as they are reflected back. The defect in the photonic crystal works as a Fabry-Perot like cavity that allows for localized states in the stopband to quantify the effects of the design parameters and we show a Fabry-Perot filter that extends through the 200 nm stopband. A compact 7 μm2 device is demonstrated with standard fabrication techniques in Silicon-on-Insulator (SOI), and compared to Fabry-Perot filters in single mode waveguides, we obtain a larger bandwidth and lower back reflections. Applications include refractive index sensors, optical communications and on-chip spectroscopy.

    Original languageEnglish
    Pages (from-to)1841-1850
    Number of pages10
    JournalOptics Express
    Volume26
    Issue number2
    DOIs
    Publication statusPublished - 2018 Jan 22

    Fingerprint

    optical filters
    coupled modes
    photonics
    waveguides
    filters
    defects
    silicon
    tapering
    phase matching
    crystals
    optical communication
    chips
    insulators
    refractivity
    bandwidth
    cavities
    fabrication
    sensors
    wavelengths
    spectroscopy

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

    Cite this

    Silicon optical filter with transmission peaks in wide stopband obtained by anti-symmetric photonic crystal with defect in multimode waveguides. / Mendez Astudillo, Manuel; Okayama, Hideaki; Nakajima, Hirochika.

    In: Optics Express, Vol. 26, No. 2, 22.01.2018, p. 1841-1850.

    Research output: Contribution to journalArticle

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