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URL:
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http://dx.doi.org/10.1364/AO.35.005102
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Document Type:
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Conference or workshop publication
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Year of publication:
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1996
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The title of a journal, publication series:
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Applied Optics
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Volume:
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35,25
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Page range:
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5102-5107
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Conference title:
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1996 International Topical Meeting on Optical Computing
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Location of the conference venue:
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Sendai, Japan
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Date of the conference:
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April 21 - 25, 1996
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Place of publication:
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Washington, DC
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Publishing house:
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OSA, Optical Soc. of America
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ISSN:
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0003-6935 , 1559-128X , 1539-4522
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Publication language:
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English
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Institution:
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School of Business Informatics and Mathematics > Optoelektronik (Brenner)
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Subject:
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004 Computer science, internet
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Abstract:
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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.
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