| 摘要 |
Device having a two-dimensionally formed support material which has, spread across at least one surface area, a plurality of pores which stretch throughout from one surface of the support material to the opposite surface, wherein the pores are bound in each case by a pore boundary area of pore walls formed in the support material along particular longitudinal axes of the pores, and at least part of the pore walls have at least in some sections a layered structure containing a first layer forming the pore boundary area and a second layer adjacent to the first layer and spaced apart from the pore boundary area, and wherein the refractive index n<SUB>waveguide </SUB>of the first layer is greater than the refractive index n<SUB>2 </SUB>of the second layer.
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