Optically Tunable Diffraction Efficiency in Reflection Grating Written in Photomobile Polymers

被引:1
|
作者
Castagna, Riccardo [1 ,2 ]
Di Donato, Andrea [3 ]
Francescangeli, Oriano [4 ]
Lucchetta, Daniele Eugenio [4 ,5 ]
机构
[1] Univ Camerino UNICAM, Polo Chim, URT, CNR, Via SantAgostino 1, I-62032 Camerino, Italy
[2] Inst Heritage Sci, CNR, Via Madonna Piano 10, I-50019 Sesto Fiorentino, Italy
[3] Univ Politecn Marche, Dept DII, Via Brecce Bianche, I-60131 Ancona, Italy
[4] Univ Politecn Marche, Dept SIMAU, Via Brecce Bianche, I-60131 Ancona, Italy
[5] Univ Politecn Marche, Optoacoust Lab, Dept SIMAU, Via Brecce Bianche, I-60131 Ancona, Italy
关键词
photomobile polymers; lasers; tunability; diffraction efficiency; refractive index modulation; VOLUME HOLOGRAPHIC GRATINGS; COMPOSITE-MATERIALS;
D O I
10.3390/photonics9100751
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this work, we report the fabrication and optical characterization of a one-dimensional reflection holographic volume phase grating recorded in a recently developed holographic photomobile composite polymer mixture. The reflection grating recorded on the photomobile material was a periodic one-dimensional arrangement of hard polymeric walls and viscous regions. The reflection notch was located in the near-infrared region of the electromagnetic spectrum. The transmission efficiency of the grating was modulated by an external CW laser light source operating at lambda = 532 nm. The transmission efficiency increased with the increase in the power of the external laser source, and in the range of the used power values, the phenomenon was completely reversible. At the highest power levels, a 48% increase in the diffraction efficiency was achieved. The increase in the diffraction efficiency was related to the growth of the refractive-index contrast of the grating. In particular, under illumination, the viscous material escaped from the irradiated area. This feature explains the experimentally observed changes in the values of the grating's refractive index.
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页数:8
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