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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 26 — Dec. 21, 2009
  • pp: 23449–23458

LED beam shaping lens based on the near-field illumination

Jae Young Joo, Chang Seog Kang, Soon Sub Park, and Sun-Kyu Lee  »View Author Affiliations

Optics Express, Vol. 17, Issue 26, pp. 23449-23458 (2009)

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This paper presents a novel method in near-field beam shaping based on the precise optical modeling of a gallium nitride light-emitting diode (GaN LED). A Monte Carlo ray tracing simulation has been utilized to calculate the spatial photon distribution near the LED’s top. By analyzing the ray data in near-field, the miniaturized lens profile is created and machined with aspherical surfaces and total internal reflection (TIR) Fresnel facets. The prototype lens reduce the viewing angle of the LED from 150° to 17.5° at full width half maximum (FWHM) while increasing the peak luminous intensity 10 times. The array of proposed lens with CSP LEDs exhibits feasibility of ultra thin uniform illumination in near-field.

© 2009 OSA

OCIS Codes
(220.1920) Optical design and fabrication : Diamond machining
(230.3670) Optical devices : Light-emitting diodes
(350.4600) Other areas of optics : Optical engineering
(220.2945) Optical design and fabrication : Illumination design
(220.4298) Optical design and fabrication : Nonimaging optics

ToC Category:
Optical Design and Fabrication

Original Manuscript: October 19, 2009
Revised Manuscript: November 29, 2009
Manuscript Accepted: November 29, 2009
Published: December 7, 2009

Jae Young Joo, Chang Seog Kang, Soon Sub Park, and Sun-Kyu Lee, "LED beam shaping lens based on the near-field illumination," Opt. Express 17, 23449-23458 (2009)

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