CAJ | 학술논문

用胶体法制备了表面分别修饰六偏磷酸钠（HMP）和2,2’-联吡啶（BPy）的Ag2S纳米微粒。通过背向简并四波混频实验装置对它们在单光子非共振区域的三阶光学非线性进行了实验研究，分别测量了两种Ag2S纳米微粒在它们超滤液中三阶非线性极化率χ(3)随浓度的变化，并拟合得到了两种纳米微粒的三阶非线性极化率。实验结果表明，双光子共振增强是实验中非线性极化的主要过程，同时实验结果也表明了局域场效应对单光子非共振三阶非线性极化率的增强作用。
용효체법제비료표면분별수식륙편린산납（HMP）화2,2’-련필정（BPy）적Ag2S납미미립。통과배향간병사파혼빈실험장치대타문재단광자비공진구역적삼계광학비선성진행료실험연구，분별측량료량충Ag2S납미미립재타문초려액중삼계비선성겁화솔χ(3)수농도적변화，병의합득도료량충납미미립적삼계비선성겁화솔。실험결과표명，쌍광자공진증강시실험중비선성겁화적주요과정，동시실험결과야표명료국역장효응대단광자비공진삼계비선성겁화솔적증강작용。
Two kinds of Ag2S nanoparticles with different surface-capping molecules (2,2’-bipyridine and hexametaphosphate ) were prepared by colloidal chemical method. Their third-order nonlinear optical properties have been studied in non-resonance region of one photon via degenerate four-wave mixing in phase conjugation geometry. The results show that two-photon resonant process greatly contributes to the third-order nonlinearities of Ag2S nanoparticles. It is also found that the third-order susceptibicities χ(3) are intensively subjected to the surface-capping molecules. This phenomenon is interpreted in terms of local field enhancement effect related to refractive index of the media around nanoparticles.