An asymmetric porous fiber with rectangular slots can be experimentally realized by using the extrusion method . For this, a two step process are required to fabricate the polymer fibers. Hope the following paper will give you some ideas.
Ref.: S. Atakaramians, S. A. Vahid, H. E. Heidepriem, M. Nagel, B. M. Fischer, D. Abbott, and T. M. Monro,“THz porous fibers: design, fabrication and experimental characterization,” Opt. Express 17, 14053–14062 (2009).
If the basis of fabrication could be laid on some results obtained in a stringent experimental condition, reported in the paper suggested by Mr. Rana, one can say everything is possible to fabricate.
There are three known basic methods of manufacturing the PCF:
1. The method of " stack and draw ";
2. The "drill" method - in the blank in the form of a rod in a certain way (depending on the material) are drilled holes in the right places, then the workpiece is exposed to the waist in a high-temperature furnace;
3. "extrusion" method - when the molten material under pressure is passed through the filler ( "stencil")
In our opinion, for your task is more suitable when it first metod- from the capillaries of bars or going to the desired shape and then package the received packet is passed through a high-temperature furnace to exhaust the machine where there is a simultaneous sintering and reduction in cross-sectional dimensions to the required. Therefore, to get the PCF with a rectangular cross-section, you must have the original capillaries with a rectangular cross-section. If PCF is necessary to make a hollow core (HC-PCF) in the assembled package must be removed, for example, four central capillaries. If you tell your e-mail will try to send a rough picture of such a structure (only the strictly periodic without the "defect" in the central part).
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