Journal
APPLIED OPTICS
Volume 55, Issue 18, Pages 4939-4945Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.55.004939
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Funding
- European Regional Development Fund [TEAM/2012-9/1]
- Operational Program Innovative Economy
- National Science Centre Research [2011/03/B/ST3/03337]
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We present a novel method for the development of diffractive optical elements (DOEs). Unlike standard surface relief DOEs, the phase shift is introduced through a refractive index variation achieved by using different types of glass. For the fabrication of DOEs we use a modified stack-and-draw technique, originally developed for the fabrication of photonic crystal fibers, resulting in a completely flat element that is easy to integrate with other optical components. A proof-of-concept demonstration of the method is presented-a two-dimensional binary optical phase grating in the form of a square chessboard with a pixel size of 5 mu m. Two types of glass are used: low refractive index silicate glass NC21 and high refractive index lead-silicate glass F2. The measured diffraction characteristics of the fabricated component are presented and it is shown numerically and experimentally that such a DOE can be used as a fiber interconnector that couples light from a small-core fiber into the several cores of a multicore fiber. (C) 2016 Optical Society of America
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