Pniewski Jacek, Kasztelanic Rafal, Nowosielski Jedrzej M, Filipkowski Adam, Piechal Bernard, Waddie Andrew J, Pysz Dariusz, Kujawa Ireneusz, Stepien Ryszard, Taghizadeh Mohammad R, Buczynski Ryszard
Appl Opt. 2016 Jun 20;55(18):4939-45. doi: 10.1364/AO.55.004939.
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 μm. 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.
我们提出了一种用于开发衍射光学元件（DOE）的新方法。与标准的表面浮雕DOE不同，相移是通过使用不同类型的玻璃实现的折射率变化来引入的。对于DOE的制造，我们使用了一种改进的堆叠拉制技术，该技术最初是为制造光子晶体光纤而开发的，从而得到一个完全平坦的元件，易于与其他光学组件集成。给出了该方法的概念验证演示——一个像素尺寸为5μm的方形棋盘形式的二维二元光学相位光栅。使用了两种类型的玻璃：低折射率硅酸盐玻璃NC21和高折射率铅硅酸盐玻璃F2。给出了所制造组件的测量衍射特性，并通过数值和实验表明，这种DOE可以用作将小芯光纤中的光耦合到多芯光纤的多个芯中的光纤互连器。
