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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 16 — Aug. 3, 2009
  • pp: 13918–13927

Analysis of the far-field region of LEDs

Ching-Cherng Sun, Wei-Ting Chien, Ivan Moreno, Chih-Ching Hsieh, and Yi-Chien Lo  »View Author Affiliations

Optics Express, Vol. 17, Issue 16, pp. 13918-13927 (2009)

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Versatility in the design of optical systems is one of the key features of light-emitting diodes (LEDs) that has attracted considerable attention. In the analysis of systems using LEDs, it is useful to know if the distance is far enough from the LED to allow the radiation pattern to be simulated by the point source approach. We propose three far-zone conditions for LED light modeling: the far-field distance, and for practical purposes the quasi far-field and minimum far-field distances. Different types of LEDs have different far-field ranges. We analyze these differences by modulating key parameters like geometrical structure of encapsulating lens, chip size, chip shape, chip position, and package errors. We find that far-field region considerably depends more on the shape of both lens and chip than all other parameters.

© 2009 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Optical Devices

Original Manuscript: April 24, 2009
Revised Manuscript: June 24, 2009
Manuscript Accepted: July 21, 2009
Published: July 27, 2009

Ching-Cherng Sun, Wei-Ting Chien, Ivan Moreno, Chih-Ching Hsieh, and Yi-Chien Lo, "Analysis of the far-field region of LEDs," Opt. Express 17, 13918-13927 (2009)

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  1. C. C. Sun, C. Y. Chen, H. Y. He, C. C. Chen, W. T. Chien, T. X. Lee, and T. H. Yang, “Precise optical modeling for silicate-based white LEDs,” Opt. Express 16(24), 20060–20066 (2008). [CrossRef] [PubMed]
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  11. F. Muñoz, P. Benı́tez, O. Dross, J. C. Miñano, and B. Parkyn, “Simultaneous multiple surface design of compact air-gap collimators for light-emitting diodes,” Opt. Eng. 43, 1522 (2004). [CrossRef]
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  13. K. Wang, X. B. Luo, Z. Y. Liu, B. Zhou, Z. Y. Gan, and S. Liu, “Optical analysis of an 80-W light-emitting-diode street lamp,” Opt. Eng. 47(1), 013002 (2008). [CrossRef]
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