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Published on: August 15, 2014
Selfoc microlens with a spherical surface
N Yamamoto1, H Nishi, K Nishizawa
1Nippon Sheet Glass Company, Ltd., Research Laboratory, Konoike, Itami 664, Japan.
Applied Optics
|April 15, 2010
Abstract:
This paper presents the light-focusing properties of a gradient-index rod lens with a spherical end surface which aims at increasing numerical aperture and decreasing lens aberration. Optimum refractive-index profiles for obtaining a smaller focused spot are derived, and the increase of numerical aperture is clarified. Experimental results are described; the Selfoc microlens with a spherical end surface realizes a focused spot below 2 microm in diameter.

