Instrumentation, Techniques, and Measurement

Design of multifunctional diffractive optical elements

[+] Author Affiliations
Anand Vijayakumar, Shanti Bhattacharya

Indian Institute of Technology Madras, Centre for NEMS and Nanophotonics, Department of Electrical Engineering, Chennai 600036, India

Opt. Eng. 54(2), 024104 (Feb 13, 2015). doi:10.1117/1.OE.54.2.024104
History: Received September 25, 2014; Accepted January 19, 2015
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Abstract.  Diffractive optics has traditionally been used to transform a parallel beam of light into a pattern with a desired phase and intensity distribution. One of the advantages of using diffractive optics is the fact that multiple functions can be integrated into one element. Although, in theory, several functions can be combined, the efficiency is reduced with each added function. Also, depending on the nature of each function, feature sizes could get finer. Optical lithography with its 1μm limit becomes inadequate for fabrication and sophisticated tools such as e-beam lithography and focused ion beam milling are required. Two different techniques, namely, a modulo-2π phase addition technique and an analog technique for design and fabrication of composite elements are studied. A comparison of the beams generated in both cases is presented. In order to be able to compare methods, specific functions of ring generation and focusing have been added in all cases.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Anand Vijayakumar and Shanti Bhattacharya
"Design of multifunctional diffractive optical elements", Opt. Eng. 54(2), 024104 (Feb 13, 2015). ; http://dx.doi.org/10.1117/1.OE.54.2.024104


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