Harmonic generation in X(2) photonic crystals

Broderick, N.G.R., Ross, G.W., Monro, T.M. and Richardson, D.J. (2000) Harmonic generation in X(2) photonic crystals. ACOFT 2000, Canberra, Australia. 01 Jun 2000.

Record type: Conference or Workshop Item (Other)

Abstract

Recently Berger [1] described theoretically the concept of a nonlinear photonic crystal. In such a crystal the nonlinearity varies periodically in multiple dimensions. These are the higher dimensional analogues of the well known quasi-phase matched crystals such as periodically poled lithium niobate (PPLN). We have fabricated what we believe to be the first example of a two dimensionally periodically poled sample of lithium niobate [2] in which the domains are arranged on a regular hexagonal lattice (see Fig. 1). The hexagonal shape of the poled domains is due to the crystal structure of lithium niobate. The scale of the particular hexagonal lattice was chosen phase match 2nd harmonic generation using light at 1536nm. In principle any lattice structure can be fabricated using standard photolithographic techniques. This nonlinear periodic crystal (NPC) had dimensions of 14mm x 7mm x 0.3mm and ~30% of the area was poled.

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