[OPTICAL REVIEW Vol. 16, No. 4 (2009) 455-457]
© 2009 The Optical Society of Japan
Fabrication of a Binary Diffractive Lens for Controlling the Luminous Intensity Distribution of LED Light
Atsushi MOTOGAITO1,2*, Narito MACHIDA1, Tadanori MORIKAWA1, Katsuhide MANABE1,3, Hideto MIYAKE1,2, and Kazumasa HIRAMATSU1,2
1Division of Electrical and Electronic Engineering, Graduate School of Engineering, Mie University, 1577 Kurima-machiya, Tsu 514-8507, Japan
2The Center of Ultimate Technology on nano-Electronics, Mie University, 1577 Kurima-machiya, Tsu 514-8507, Japan
3New Paradigm Technology Inc., 4-20-3 Ebisu, Shibuya, Tokyo 150-6018, Japan
(Received August 28, 2008; Accepted March 30, 2009)
To control the luminous intensity of an light-emitting diode (LED), we designed and fabricated a binary diffractive lens by electron beam lithography on a poly(ethylene terephthalate) (PET) film. We showed that it is possible to control luminous intensity distribution using the binary diffractive lens. To improve the diffraction efficiency, we then designed a binary blazed diffractive lens with a focal length of 140 μm. With a binary blazed diffractive lens having a focal wavelength of the order of micrometers, it is possible to create a small, thin light source for controlling the distribution of luminous intensity.
Key words: binary diffractive lens, electron beam lithography, LED, luminous intensity, optical films, binary blazed diffractive lens
*E-mail address: motogaito@elec.mie-u.ac.jp