We evaluated the numerical aperture (NA) and focusing characteristics of a planar microlens (PML) for parallel optical interconnect systems. The NA of a PML of 250 µm in diameter was measured to be 0.07 using a 125 µm mask aperture to clean the beam profile. By stacking two PMLs, the NA was raised to 0.17 due to the elliptical index profile of the stacked PML. The spot diameter was 11 µm, which is nearly equal to the diffraction limit and is usable for single-mode application.
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Aoki et al. (2001) studied this question.
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