Dichroic Bragg reflectors based on birefringent porous silicon

Reference:

Diener, J., Kunzner, N., Kovalev, D., Gross, E., Timoshenko, V. Y., Polisski, G. and Koch, F., 2001. Dichroic Bragg reflectors based on birefringent porous silicon. Applied Physics Letters, 78 (24), pp. 3887-3889.

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Abstract

Multilayers of anisotropically nanostructured silicon (Si) have been fabricated and studied by polarization-resolved reflection measurements. Alternating layers having different refractive indices exhibit additionally a strong in-plane anisotropy of their refractive index (birefringence). Therefore, a stack of layers, acting as a distributed Bragg reflector, has two distinct reflection bands, depending on the polarization of the incident linearly polarized light. This effect is governed by a three-dimensional (in-plane and in-depth) variation of the refractive index. These structures can yield optical effects which are difficult to achieve with conventional Bragg reflectors. (C) 2001 American Institute of Physics.

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