Physical Optics, Diffractive Optics

Diffractive infrared lens with extended depth of focus

[+] Author Affiliations
Zhiqiang Liu

University of Miami, Department of Electrical and Computer Engineering, 1251 Memorial Drive, Coral Gables, Florida 33146

Angel Flores

University of Miami, Department of Electrical and Computer Engineering, 1251 Memorial Drive, Coral Gables, Florida 33146

Michael R. Wang

University of Miami, Department of Electrical and Computer Engineering, 1251 Memorial Drive, Coral Gables, Florida 33146

Jame J. Yang

New Span Opto-Technology Inc., 9380 SW 72nd Street, B-180, Miami, Florida 33173

Opt. Eng. 46(1), 018002 (January 12, 2007). doi:10.1117/1.2430506
History: Received February 07, 2006; Revised June 16, 2006; Accepted June 23, 2006; Published January 12, 2007
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An infrared imaging lens that produces beams with long focal depth while preserving the entire aperture for full light capturing and high transverse resolution is presented. Based on the conjugate-gradient algorithm, a diffractive optical lens with four times depth of focus improvement at the 10.6-μm wavelength has been designed and fabricated. ZEMAX simulation has confirmed the designed lens performance showing legible images over an extended image range. Through laser direct-write photoresist patterning and subsequent reactive ion etching on a germanium substrate, we have realized a diffractive lens with four times depth of focus improvement over a conventional infrared lens of the same numerical aperture. The extended depth of focus lens should yield a variety of applications in focus-free imaging without reducing lens aperture.

Figures in this Article
© 2007 Society of Photo-Optical Instrumentation Engineers

Citation

Zhiqiang Liu ; Angel Flores ; Michael R. Wang and Jame J. Yang
"Diffractive infrared lens with extended depth of focus", Opt. Eng. 46(1), 018002 (January 12, 2007). ; http://dx.doi.org/10.1117/1.2430506


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