Realization and optimization of planar microlenses by Ag-Na ion-exchange techniques

Bähr, Jochen ; Brenner, Karl-Heinz

Document Type: Conference or workshop publication
Year of publication: 1996
The title of a journal, publication series: Applied Optics
Volume: 35,25
Page range: 5102-5107
Conference title: 1996 International Topical Meeting on Optical Computing
Location of the conference venue: Sendai, Japan
Date of the conference: April 21 - 25, 1996
Place of publication: Washington, DC
Publishing house: OSA, Optical Soc. of America
ISSN: 0003-6935 , 2155-3165 , 1539-4522
Publication language: English
Institution: School of Business Informatics and Mathematics > Optoelektronik (Brenner 1999-2008)
Subject: 004 Computer science, internet
Abstract: We report the fabrication of planar microlenses with numerical apertures (N.A.'s) of 0.2 by field-assisted Ag-Na ion exchange in glass. To measure the N.A. of microlenses, different definitions can be used. We discuss the issue of measuring the N.A. and suggest an additional definition based on diffraction-limited performance. According to a simple model, the N.A. of a spherical lens is limited by the maximum index difference. Owing to this model, the N.A. for Ag-Na ion exchange is limited to a value of ~0.1. From measurements of microlenses, fabricated by field-assisted ion exchange, we obtained N.A.'s as high as 0.2, providing for diffraction-limited performance within the whole aperture.

Dieser Eintrag ist Teil der Universitätsbibliographie.

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