Lasing Characteristics and Ultra High-Speed Optical Dynamics from Single Microdroplets Containing Gain-Highly Scattering Turbid Media

在调查与本项目相关的领域趋势时，我们注意到到目前为止，多次光散射和球面共振（形态学相关共振；MDR）的有效性已经相互独立地讨论过。本项目将多重光散射与具有高共振质量因子的MDR相结合，探索含增益-高散射浑浊介质的单微滴光学特性的基本动力学。光增益随机介质中的激光作用近年来引起了人们的极大兴趣，并进行了实验研究以揭示其输出、空间和光谱特性。根据实验方法将其分为两类。第一个是由Lawandy的小组发起的Lawandy等人。Nature, p.436,1994]，基于光抽运的染料体溶液与强散射的固体纳米TiO_2散射体混合。第二种方法…More最初依赖于染料掺杂的液体球形微滴（微球），其中透明介质产生高q值的光学腔，因此可以很容易地通过强激光束激发观察到激光作用[P.W.]巴伯和R.K.Chang，埃德。，“与小粒子相关的光学效应”，《世界科学》，新加坡，1988年。本项目的研究结果如下：1)通过将聚甲基丙烯酸甲酯（PMMA）固体纳米颗粒取代罗丹明6G （RH6G）染料微滴，我们首次报道了激光发射的显著增强，并伴有明确的阈值[H]。[j].环境科学，1996(2)。2)后续实验采用高散射脂质-10%的脂肪乳剂与激光染料混合在球形微滴中进行[j] .物理学报。719年,1996年;[3]黄素在生物化学中的应用[中国生物化学学报，1997,P7, p.157,1997], 4)生物组织中直接提取色素的研究[j] .生物化学学报，p.157,1997。1484年,1996年;《中国生态学报》1997年第6期，第1页；Electron.Lett.p。[1797,1997]作为最后的。5)我们还证实了在这些染料-高散射纳米颗粒混合物中，由于球腔的MDR而导致的模式结构的消失取决于散射物的取代含量；即表明多次光散射在微滴内部建立激光中起主导作用。这个项目的主要目的是在世界范围内提前完成。少

In surveying a trend of the field related to this Project, we notice that the effectiveness of multiple light scattering and of spherical resonance (morphology-dependent resonance ; MDR) has been discussed independently each other, up to the present. This Project pursued probing the fundamental dynamics of optical properties in single microdroplets containing gain-highly scattering turbid media, combining the multiple light scattering and the MDR with high quality-factor of resonances.Lasing action in optical gain random media has attracted recently a great deal of interest and experimental studies were performed to reveal the output, spatial, and spectral characteristics of the emission. They are divided into two categories according to the experimental methods. The first one, initiated by Lawandy's group [N.M.Lawandy et al. Nature, p.436,1994], is based on optically pumped bulk solution of dye mixed with strongly scattering solid-nanoparticles of TiO_2 scatterers. The second approach … More relies originally on dye-doped liquid spherical microdroplets (microspheres) in which transparent medium produces optical cavities with high-Q values so that laser action can be readily Observed by excitation with intense laser beams [P.W.Barber and R.K.Chang, Eds., "Optical effects associated with small particles, "World Scientific, Singapore, 1988]. The results obtained from this Project are as follows :1) By substituting the poly (methyl methacrylate) (PMMA) solid-nanoparticles into Rhodamine 6G (RH6G) dye microdroplet, we have first reported significantly enhanced laser emission accompanying with the well-defined thresholds [H.Taniguchi et al.Opt.Lett.p.263,1996]. 2) Succeeding experiments were performed using highly scattering fat emulsion Intralipid-10% in spherical microdroplets mixed with some laser dyes [Appl.Phys.Lett.p.719,1996 ; Appl.Opt.in Press] and, 3) a new biochemical material (Ribo-Flavin) [CLEO/Pacific Rim '97, P7, p.157,1997], 4) together with pigments extracted directly from biological tissues [Electron.Lett.p.1484,1996 ; CLEO/Pacific Rim '97, P6, p.156,1997 ; Electron.Lett.p.1797,1997] as lasants. 5) We have also confirmed in these dye-highly scattering nanoparticle mixtures, the disappearance of the mode structures due to MDR's of spherical cavities depending on the substituted contents of the scatteres ; i.e., indicative of dominant role of multiple light scattering to establish lasing inside the microdroplet.The main aim of this Project was accomplished sufficiently in advance of the world by this Project. Less