Optical Properties of Dye Laser Thin Films Doped with Gold Nanoparticles.

掺杂金纳米粒子的染料激光薄膜的光学特性。

• 批准号: 10650043
• 负责人: YANAGI Hisao
• 金额: $ 2.18万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650043/
• 关键词: Au nanoparticles; Rhodamine dye; Silica; titania; Sol-gel method; Thin film lasing; Fluorescence properties; Atomic force microscopy; patternig; シリカ; チタニア; 原始間力顕微鏡

Laser action on thin films that operates without using an external cavity or constructing a periodic spatial structure is attracting interest for application to integrated photonic devices. In this study, we first fabricated thin gain media with rhodamine doped silica(SiOィイD22ィエD2)/titania(TiOィイD22ィエD2) composite films by the sol-gel technique. An existence of thickness cutoff for gain narrowing and light trapping in the optically richer film with higher TiOィイD22ィエD2/SiOィイD22ィエD2 ratio suggested a contribution of multiple inward reflections of emitted light within simple asymmetric planar waveguides. The observed peak separations between discrete waveguided modes were strongly indicative of lasing by a longitudinal resonant structure with coherent length in the order of tens of micrometers.Secondly, gold (Au) nanoparticles were fabricated in the SiOィイD22ィエD2/TiOィイD22ィエD2 films to modify their optical functions based on nonlinear optical effects and single electron charging phenomena. U … More nder ultraviolet irradiation, Au(III) ions doped in the films were reduced to generate gold particles accompanying an evolution of the surface plasmon band. Bu means of atomic force microscopy (AFM) using a conductive cantilever, local reduction of the Au(III) ions also generated Au particles embedded at a certain position of the film. The size of the particles were controlled by the voltages applied between the cantilever and an indium-tin-oxide coated glass substrate.Finally, fluorescence properties of rhodamine-doped SiOィイD22ィエD2/TiOィイD22ィエD2 films was controlled by incorporation of Au nanoparticles. As-deposited films doped with rhodamine and Au(III) ions exhibited no fluorescence due to quenching of the excited states of rhodamine by Au(III) ions. After generation of gold nanoparticles by photoreduction under ultraviolet irradiation, the rhodamine dye was reactivated to emit fluorescence. This photoresponsive phenomenon enabled us to make fluorescent micropatterns by selective particle generation in the film using a photomask as well as a UV pulse laser. Fabrication of fluorescence patterning was also carried out by local reduction of Au(III) ions using AFM with a conductive cantilever. Less

激光作用在薄膜上，不使用外腔或构建周期性空间结构的操作是吸引兴趣的应用集成光子器件。在本研究中，我们首先利用溶胶-凝胶技术制备了罗丹明掺杂的二氧化硅（SiO_xD_22）/二氧化钛（TiO_xD_22）复合薄膜作为薄增益介质。在具有较高TiO_（22）O观察到的离散波导模式之间的峰值分离强烈指示激光的纵向共振结构的相干长度在几十微米的顺序。其次，金（Au）纳米颗粒制备在SiO_xO U ...更多信息 在紫外光照射下，掺杂在薄膜中的Au（III）离子被还原生成金粒子，并伴随着表面等离子体激元带的演化。利用原子力显微镜（AFM）的导电悬臂梁，局部还原Au（III）离子也生成Au颗粒嵌入薄膜的某个位置。最后，通过掺杂Au纳米粒子来控制若丹明掺杂的SiO_xO_22_xO_2/TiO_xO_22_xO_2薄膜的荧光性能。由于Au（III）离子对罗丹明的激发态的猝灭，掺杂罗丹明和Au（III）离子的沉积膜没有荧光。在紫外光照射下通过光还原产生金纳米颗粒后，罗丹明染料被重新激活以发射荧光。这种光响应现象使我们能够通过使用光掩模以及UV脉冲激光在膜中选择性地产生颗粒来制作荧光微图案。荧光图案化的制造也进行了局部还原Au（III）离子使用AFM与导电悬臂。少

项目成果

S. Takeoka: "Size-Dependent Near-Infrared Photoluminescence from Ge Nanocrystals in SiO_2 Matrices"Physical Review B. 58. 7921-7925 (1998)

S. Takeoka：“SiO_2 基质中 Ge 纳米晶体的尺寸依赖性近红外光致发光”物理评论 B. 58. 7921-7925 (1998)

Y. Inoue: "Single-Electron Tunneling through Ge Nanocrystals Fabricated y Cosputtering Method"Solid-State Electronics. 42. 1605-1608 (1998)

Y. Inoue：“通过 Ge 纳米晶体制造的单电子隧道和共溅射方法”固态电子学。

T. Kume: "Long-Range Surface Modes Supported by SiO_2-Ag Composite Thin Films"Surface Science. 395. 23-29 (1998)

T. Kume：“SiO_2-Ag复合薄膜支持的长程表面模式”表面科学。

P. Xu: "Fluorescence Patterning in Dye-Doped Sol-Gel Films by Generation of Gold Nanoparticles"Chemistry of Material. 11. 2626-2628 (1999)

P. Xu：“通过生成金纳米粒子在染料掺杂溶胶-凝胶薄膜中形成荧光图案”材料化学。

Y. Inoue: "Single-Electron Tunneling through Si Nanocrystals Dispersed in Phosphosilicate Glass Thin Films"Journal of Applied Physics. 86. 3199-3203 (1999)

Y. Inoue：“通过分散在磷硅酸盐玻璃薄膜中的硅纳米晶体的单电子隧道”应用物理学杂志。