Joo Jae Young, Kang Chang Seog, Park Soon Sub, Lee Sun-Kyu
Department of Mechatronics, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Republic of Korea.
Opt Express. 2009 Dec 21;17(26):23449-58. doi: 10.1364/OE.17.023449.
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 degrees to 17.5 degrees 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.
本文提出了一种基于氮化镓发光二极管（GaN LED）精确光学建模的近场光束整形新方法。利用蒙特卡罗光线追踪模拟来计算LED顶部附近的空间光子分布。通过分析近场中的光线数据，制作并加工出具有非球面表面和全内反射（TIR）菲涅尔面的小型化透镜轮廓。该原型透镜在半高宽（FWHM）处将LED的视角从150度减小到17.5度，同时将峰值发光强度提高了10倍。所提出的透镜与芯片级封装（CSP）LED阵列在近场中展现出超薄均匀照明的可行性。
