Direct laser writing of luminescent patterns within the material consisting of the polymer (PMMA) matrix with dissolved precursor (TEDBCd) molecules is demonstrated. The luminescence here is related to the UV induced growth of CdS nanoparticles. The irradiation was performed by the third harmonic of a Nd:YAG laser with a pulse duration of 15 ns. The irradiated polymer films were kept at ambient temperatures of about 100 °C. At the maximum scanning speed, the luminescent signal is very low. A decrease in the scanning speed results in an increase in the luminescent signal and a shift of the luminescent spectrum towards longer wavelengths. However, at some speed, the increase in the luminescent signal is changed by its descent. This suggests the existence of an optimal laser exposure for the laser-induced luminescent pattering. This observation was confirmed when recording separate spots by a focused laser beam at different laser fluences. The luminescent hexagonal pattern consisting of micron-sized spots within the material bulk is obtained by means of irradiation of a single layer of closely packed ten-micron polystyrene spheres deposited on the material surface. The shape of these spots is discussed by comparing it with the calculated laser intensity space distribution within photonic jets.

中文翻译：

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通过激光照射含有可溶性 CdS 前体的 PMMA 基质记录的发光图案

演示了在由聚合物 (PMMA) 基质和溶解的前体 (TEDBCd) 分子组成的材料内直接激光写入发光图案。这里的发光与 CdS 纳米粒子的紫外线诱导生长有关。照射由 Nd:YAG 激光器的三次谐波进行，脉冲持续时间为 15 ns。辐照后的聚合物薄膜保持在约 100 °C 的环境温度下。在最大扫描速度下，发光信号非常低。扫描速度的降低导致发光信号的增加和发光光谱向更长波长的偏移。然而，在某些速度下，发光信号的增加会因它的下降而改变。这表明存在用于激光诱导发光图案的最佳激光曝光。当通过不同激光能量密度的聚焦激光束记录单独的光点时，这一观察得到了证实。通过对沉积在材料表面上的单层紧密堆积的十微米聚苯乙烯球体进行辐照，可以获得由材料本体中微米级斑点组成的发光六边形图案。通过将这些光斑的形状与光子射流内计算的激光强度空间分布进行比较，讨论了这些光斑的形状。