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首页> 外文期刊>Advanced Materials for Optics and Electronics >Photostimulated Optical SHG in BEDO-TTF Polyiodide/Polycarbonate Composites
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Photostimulated Optical SHG in BEDO-TTF Polyiodide/Polycarbonate Composites

机译：BEDO-TTF聚碘化物/聚碳酸酯复合材料中的光刺激光学SHG

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摘要

Measurements of photoinduced optical second-harmonic generation (PISHG) for the bis(ethylenedioxy)tetrathiofulvalene (BEDO-TTF)/iodine complex in a polycarbonate matrix were performed. Two kinds of samples were studied: as-obtained, grey-violet material, showing a metal-like temperature dependence of conductivity down to liquid helium temperature (system 1), and electrochemically decoloured, transparent (slightly grey) material, showing metallic conductivity down to about 30 K and semiconductive properties below this temperature (system 2). An increase in the PISHG signal with decreasing temperature was observed below 10 K for both specimens. In the temperature range 40-88 K, an increase then a decrease in PISHG with increasing temperature was observed for specimen 2, while practically no PISHG signal was recorded for sample 1. The dependences obtained indicate unambiguously the essential influence of the BEDO-TTF(I) dopant on the PISHG of polycarbonate composites. Simultaneously, competition was demonstrated between the optical second- and third-harmonic signals at photoinducing fluxes near 10~(15) photons cm~2. A strong increase in the PISHG signal at low temperatures was observed for both systems (below 11 K for sample 2 and below 7 K for sample 1). In the temperature range 40-88 K a maximum of the PISHG was observed only for specimen 2. At higher temperatures the intensity of the PISHG was very low in both kinds of samples.
机译：测量了聚碳酸酯基体中双（乙烯二氧基）四硫富瓦烯（BEDO-TTF）/碘配合物的光诱导光学二次谐波生成（PISHG）。研究了两种样品：刚获得的灰紫色材料，其电导率下降到液氦温度（系统1）显示出类似金属的温度依赖性；电化学染色的透明材料（浅灰），显示出降低的金属导电率至大约30 K，并且在该温度以下（系统2）具有半导电特性。对于两个样品，在低于10 K的温度下观察到PISHG信号随温度降低而增加。在40-88 K的温度范围内，样品2观察到PISHG随温度升高而先升高后降低，而样品1几乎未记录到PISHG信号。所获得的依赖性明确表明BEDO-TTF（ I）在聚碳酸酯复合材料的PISHG上的掺杂剂。同时，在10〜（15）个光子cm〜2附近的光诱导通量下，第二和第三谐波光学信号之间存在竞争。两种系统在低温下都观察到PISHG信号的强烈增加（样品2低于11 K，样品1低于7 K）。在40-88 K的温度范围内，仅对样品2观察到PISHG的最大值。在较高温度下，两种样品的PISHG强度都非常低。

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