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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >The problem of achieving high second-order nonlinearities in glasses: The role of electronic conductivity in poling of high index glasses
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The problem of achieving high second-order nonlinearities in glasses: The role of electronic conductivity in poling of high index glasses

机译：在玻璃中实现高二阶非线性的问题：电子传导率在高折射率玻璃极化中的作用

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摘要

Efficient thermal poling of electronically conducting glass is prevented by the inherent difficulty to record a large electrostatic field within such glasses. To overcome this limitation, a waveguide/substrate configuration has been proposed, in which the glass for poling was deposited as a film of appropriate thickness on a substrate chosen for its higher ionic conductivity. Owing to this configuration, the poling voltage drops entirely across the glass film, allowing high electrostatic field to be recorded in spite of the high electronic conductivity of the glass. The proposed method was demonstrated here in the case of bismuth-zinc-borate glasses, which possess high potential for poling because of their high intrinsic χ~((3)). A four-fold enhancement of χ~((2)) compared to bulk glass, from ～ 0.5 to ～ 2 pm/V, is demonstrated. It is also shown that the χ~((2)) values obtained are the highest sustainable by the glass limited by the onset of nonlinear conductivity. The waveguide/substrate configuration intrinsically allows obtaining perfect overlap of the poling induced second-order nonlinearity with the guiding region of the waveguide. An equivalent RC-circuit model describing the poled glass reveals that the value of the poling-induced second-order nonlinearity is strongly dependent on the ratio β between ionic and electronic conductivity. The most promising glass systems for poling are found to be the ones displaying the highest product χ ~((3))β. This work is performed on bismuth-zinc-borate heavy metal oxide glasses but the waveguide/substrate configuration proposed here is likely to be equally successful in enhancing the second-order nonlinearity in high χ~((3)) electronic conducting glasses such as for example telluride and chalcogenide glasses.
机译：由于在这种玻璃内记录大的静电场的固有困难，阻止了导电玻璃的有效热极化。为了克服该限制，已经提出了波导/衬底构造，其中用于极化的玻璃以适当厚度的膜沉积在被选择为其更高的离子电导率的衬底上。由于这种构造，极化电压整个玻璃膜上全部下降，尽管玻璃具有高电导率，仍可记录高静电场。本文在硼酸铋锌玻璃的情况下证明了该方法，该玻璃因其固有的χ〜（（3））高而具有极高的极化潜力。结果表明，与块状玻璃相比，χ〜（（2））增强了四倍，从〜0.5到〜2 pm / V。还表明，所获得的χ〜（（2））值是受非线性传导率限制的玻璃的最高可持续性。波导/衬底配置本质上允许获得极化引起的二阶非线性与波导的引导区域的完美重叠。描述极化玻璃的等效RC电路模型表明，极化引起的二次非线性的值在很大程度上取决于离子电导率与电子电导率之比β。发现用于极化的最有前途的玻璃系统是显示最高乘积χ〜（（3））β的系统。这项工作是在硼酸铋锌重金属氧化物玻璃上进行的，但此处提出的波导/基片配置可能同样可以成功地增强高χ〜（（3））电子导电玻璃的二次非线性。例如碲化物和硫属化物玻璃。

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