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Designing of Light Emitting Diode Lens with Spatial Uniformity Improvement for Cell Illuminating Apparatus

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Use of a secondary lens for various applications involving Light Emitting Diode (LED) illumination has gained much popularity in the past few decades. Among these, biomedical-based illumination applications, which require energy efficient illumination, have become one of the most challenging engineering issues. However, there exists a trade-off between the extraction energy E and the uniformity of the illumination pattern. We therefore propose a methodology to improve the uniformity of the illumination pattern for biomedical illumination applications. A non-spherical lens is designed to optimize the illumination uniformity in an area; we demonstrate a major improvement in the illumination uniformity i.e., from 28.4% (E = 48.46 Lumens within radius R = 140 mm) to 95.3% (E = 43.68 Lumens within R = 150 mm circular region under). Improvements in uniformity with E remaining almost the same can be helpful in cell stimulating applications, such as optogenetic or optical neural guiding experiments.
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Document Type: Research Article

Publication date: September 1, 2013

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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