Azo-dye-doped absorbing photonic crystals with purely imaginary refractive index contrast and all-optically switchable diffraction properties

作者：Liu Y J^*; Dai H T; Leong Eunice S P; Teng J H; Sun X W

来源：Optical Materials Express, 2012, 2(1): 55-61.

DOI：10.1364/OME.2.000055

We demonstrate a two-dimensional absorbing photonic crystal with a uniform real part of the refractive index, but a periodically modulated imaginary part. It was realized through back-filling the voids of a periodic array of azo-dye-doped polymeric disks with the same undoped polymers. The photonic crystals were characterized using the diffraction method. The experimental results showed that only the light in the spectral range where the azo-dye absorbed was diffracted, indicating that a purely absorbing photonic crystal was formed. This absorbing photonic crystal also showed switchable diffraction properties due to the trans-cis isomerization of the azo-dye under the light pump.

• 出版日期2012-1-1
• 单位天津大学; 南阳理工学院