Multistage polymeric lens structure in silica-waveguides for photonic functional circuits

Atsushi Tate, Takanori Suzuki, Hiroyuki Tsuda

    Research output: Contribution to journalConference articlepeer-review


    A waveguide lens composed of multistage polymer-filled thin grooves in a silica planar lightwave circuit (PLC) is proposed and the low-loss structure is designed. Both an imaging optical system and a Fourier-Transform optical system can be configured in a PLC by use of a waveguide lens. It makes a PLC functional and its design flexible. Moreover, a focal length of a lens is tunable with large thermo-optic effect of the polymer. A concatenated lens is formed to attain a desirable focal length with low-loss. The thickness of each lens and the spacing are about 10-50 μm. The simulation showed that the radiation loss of the light propagate through 20-stage grooves filled with a polymer was only 0.868 dB when the refractive index of the polymer was 1.57, the groove width was 30 μm, and the spacing between adjacent grooves was 15 μm. For example, the single lens structure that the center thickness is 30 μm, the diameter is 300 μm, and the refractive index of the polymer was 1.57, have a focal length of 4600 μm. The focal length of 450 μm can be obtained with 20-stage concatenated lens structure. The larger numerical aperture can be realized with a polymer of higher refractive index. We have applied the concatenated lens structure to various photonic circuits including optical couplers, a variable optical attenuator.

    Original languageEnglish
    Article number52
    Pages (from-to)328-335
    Number of pages8
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Publication statusPublished - 2005 Jul 21
    EventOrganic Photonic Materials and Devices VII - San Jose, CA, United States
    Duration: 2005 Jan 242005 Jan 26


    • Multistage lens
    • Optical attenuator
    • Optical coupler
    • PLC
    • Polymer
    • Silica waveguide

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering


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