1982•Applied OpticsRequires access

Selfoc microlens with a spherical surface

Naoto Yamamoto, Hisami Nishi, Koichi Nishizawa, I. Kitano

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.

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Available abstract

Key concepts: Microlens, Optics, Numerical aperture, Spherical aberration, Refractive index, Lens (geology), Materials science, Aperture (computer memory)