Abstract
Silicon is the basis for majority of integrated devices. However, its indirect band gap and highly isotropic cubic lattice structure limits applications for active and passive optical devices. There is an ongoing effort to use nanostructured material to modify the electronic and crystal structure of the silicon. Possible directions include porous silicon [1], Si-SiO2 superlattices [2] and Si nanocrystal assembly [3]. Recently a novel approach has been demonstrated [4]. If (110) silicon surface is etched the preferable propagation of porous material is in [100] direction. The density of pores determines the effective dielectric properties, i.e. etching creates a difference in refractive indices in (110) plane of the crystal. One can also form a one-dimensional photonic crystal by modulating the etching current [5]. In this work we produce such an anisotropic photonic crystal and study its nonlinear optical response and symmetry be means of optical harmonics generation.
© 2003 Optical Society of America
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