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Imaging Biological Samples with Optical Microscopy01:18

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High numerical aperture planar microlens with swelled structure.

M Oikawa, H Nemoto, K Hamanaka

    Applied Optics
    |June 26, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed high numerical aperture planar microlenses using ion exchange and swelling structures. These 2-D integrated microlenses, with diameters from 10-400 microm, improve light coupling for laser diodes and single-mode fibers.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Microfabrication

    Background:

    • Planar microlenses are 2-D integrated optical components.
    • Selective ion exchange is a common fabrication technique for microlenses.
    • Achieving high numerical aperture in planar microlenses is challenging.

    Purpose of the Study:

    • To demonstrate a new class of planar microlens with a high numerical aperture.
    • To investigate the use of swelling structures and ion-volume differences for enhanced lens properties.
    • To evaluate the performance of these microlenses in light coupling applications.

    Main Methods:

    • Fabrication of planar microlenses using selective ion exchange.
    • Incorporation of swelling structures and ion replacement to control refractive index distribution.
    • Characterization of lens diameter, numerical aperture, and light coupling efficiency.

    Main Results:

    • Successfully fabricated planar microlenses with diameters ranging from 10 to 400 micrometers.
    • Achieved a numerical aperture greater than 0.5 for microlenses with diameters smaller than 100 micrometers.
    • Demonstrated effective light coupling between a laser diode (LD) and a single-mode fiber.

    Conclusions:

    • The novel planar microlens design offers a high numerical aperture.
    • The swelling structure and ion replacement technique are effective for tailoring microlens performance.
    • These high numerical aperture planar microlenses show promise for efficient optical coupling in fiber optic systems.