The modulation of the spontaneous emission of Rhodamine 6G has been observed in one-dimensional periodic dielectric structure of dichromated gelatin film with refractive index contrast as low as 0.01. The spontaneous emission is enhanced at the band edges and inhibits in the band gap, which agree well with the theoretical analysis on the redistribution of the fractional local density of optical states.
LI Wei 1 , ZHANG XinZheng 1 , WANG ZhenHua 1 , WU Qiang 1 , LIU LongChang 1 , XU JingJun 1 & Tang BaiQuan 2 1 The MOE Key Laboratory of Weak-Light Nonlinear Photonics, TEDA Applied Physics School, Nankai University, Tianjin 300457, China
The phase shifts of the extinction and refractive index gratings to the illumination pattern are revealed in doped polymethyl methacrylate （PMMA）. The dynamic process of these shifts is studied via two-wave coupling at 351 nm. It is shown that these shifts are from the strain and the shrinkage inside the sample and accompanied with the photo-repolymerization process during the building process of the holographic grating. Such shifts will cause obvious energy exchange between the two recording beams and enough attention should be paid to the nonlocal property of the holographic gratings of the material in the application.
