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Related Experiment Video

Updated: Jun 13, 2026

Single Plane Illumination Module and Micro-capillary Approach for a Wide-field Microscope

Single Plane Illumination Module and Micro-capillary Approach for a Wide-field Microscope

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.

|April 15, 2010

Summary

This summary is machine-generated.

This study introduces a gradient-index rod lens with a spherical end, enhancing numerical aperture and reducing aberration. Experiments show this Selfoc microlens achieves a focused spot smaller than 2 micrometers.

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Area of Science:

Optics and Photonics
Materials Science

Background:

Gradient-index (GRIN) rod lenses offer unique light-focusing properties.
Traditional GRIN lenses face limitations in numerical aperture and aberrations.
Spherical end surfaces present a novel approach to GRIN lens design.

Purpose of the Study:

To investigate the light-focusing characteristics of a gradient-index rod lens with a spherical end surface.
To optimize refractive-index profiles for enhanced numerical aperture and reduced lens aberrations.
To experimentally validate the performance of the designed microlens.

Main Methods:

Derivation of optimum refractive-index profiles for spherical-ended GRIN lenses.
Theoretical analysis of numerical aperture enhancement and aberration reduction.
Fabrication and experimental testing of Selfoc microlenses with spherical ends.

Main Results:

Optimum refractive-index profiles were successfully derived.
Significant increase in numerical aperture was achieved.
Experimental Selfoc microlens demonstrated a focused spot diameter below 2 micrometers.

Conclusions:

The gradient-index rod lens with a spherical end surface effectively enhances numerical aperture.
This design significantly reduces lens aberrations, leading to improved focusing.
The Selfoc microlens with a spherical end is a promising technology for high-resolution focusing applications.