All-polymer photonic crystal slab sensor

Pétur Gordon Hermannsson, Kristian Tølbøl Sørensen, Christoph Vannahme, Cameron Smith, Jan J. Klein, Maria-Melanie Russew, Gabi Grützner, Anders Kristensen

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    An all-polymer photonic crystal slab sensor is presented, and shown to exhibit narrow resonant reflection with a FWHM of less than 1 nm and a sensitivity of 31 nm/RIU when sensing media with refractive indices around that of water. This results in a detection limit of 4.5x10-6 RIU when measured in conjunction with a spectrometer of 12 pm/pixel resolution. The device is a two-layer structure, composed of a low refractive index polymer with a periodically modulated surface height, covered with a smooth upper-surface high refractive index inorganic-organic hybrid polymer modified with ZrO2-based nanoparticles. Furthermore, it is fabricated using inexpensive vacuum-less techniques involving only UV nanoreplication and polymer spin-casting, and is thus well suited for single-use biological and refractive index sensing applications.
    Original languageEnglish
    JournalOptics Express
    Issue number13
    Pages (from-to)16529-16539
    Publication statusPublished - 2015


    • Photonic crystal waveguides
    • Polarization-selective devices
    • Subwavelength structures
    • Sensors
    • Optical design and fabrication


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