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

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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