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HL: Halbleiterphysik

HL 58: Poster IIb

HL 58.37: Poster

Dienstag, 8. März 2005, 16:30–19:00, Poster TU F

Larger bandgaps of photonic crystals fabricated by holographic lithography can be realized by the beam design — •Xiulun Yang¹ and L.Z. Cai² — ¹Institute of Applied Physics, University of Bonn — ²Department of optics, Shandong University, 250100, P. R. China

The existence of photonic band gaps (PBGs) is the most important property and the basis of many applications of photonic crystals (PhCs). One of the fundamental tasks of PBG engineering is how to obtain and maximize a PBG for a given structure. A unique feature of the PhCs produced by the holographic method is that the shape and size of the resultant element spots, referred to as atoms of the structure, take the form of the equal- intensity surfaces of the interference field. Naturally they vary with the beam design and the choice of the threshold intensity, and they are usually different from the regular shapes like a cylinder or a sphere reported before. Therefore a more specific PBG study of the PhCs of this kind considering their special atom shape and size becomes necessary. In our recent work we have taken two-dimensional triangular and square lattices as an example to investigate the PBG property of holographically recorded PhCs, and shown that the holographic method gives us a new freedom for PBG engineering. This work was supported by BMBF(13N8340), DFG (SPP1113), the National Natural Science Foundation of China (50173015 and 60177002), foundation NSFC/RGC of China (50218001), and the China Postdoctoral Foundation.