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Research on the precipitation of quantum-size particles from Ag_2O-doped glasses

Ag_2O掺杂玻璃中量子尺寸粒子的沉淀研究

基本信息

批准号：
06452316
负责人：
SHIBATA Shuichi
金额：
$ 5.06万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Glasses containing quantum-size metal particles can exibit a large nonlinear optical susceptibility, X^<(3)>, with ultra fast speed of nsec - psec. They are currently at the forefront reseaech for photonic switches in optical communication and optical computing. This research has been dedicated to prepare high-content Ag_2O-doped glass substrates and subsequently demonstrate precipitation of quantum-size particles by ion irradiation of 10-20keV ion energy.Because of good chemical durability and easy Ag ion doping, P_2O_5-Al_2O_3-Ag_2O(Ag_2O=10-20 mol %) were chosen as glass substrate materials. Ion irradiation such as N_2^+, Ar^+ with relatively low energy can precipitate high concentration of the quantum-sized Ag particles near the glass surface. Their sizes were estimated directly by FE-SEM,and from the data of the intensity and shape of the plasma absorption peak at the wavelength of 420 nm.To measure the X^<(3)> value, the Ag particle concentration should increase. Thus, appropriate glass composition was searched : P_2O_5-Al_2O_3-Ag_2O (15-20mol %) -Na_2O (15-20mol %) glasses were successfully found and resulted in the two times concentration as large as that of non-Na_2O glasses. At 450 nm wavelength, by degenerate four-wave mixing (DFWM) with a short pulsu laser, X^<(3)> of 5.5-8.8*10^<-7> esu was estimated from these samples. Precise control of particle size by the technique is in progress.

含有量子尺寸金属颗粒的玻璃可以表现出很大的非线性光学极化率X^（3），其速度超快，可达nsec - psec。他们目前处于光通信和光计算中光子交换研究的最前沿。本研究以P_2O_5-Al_2O_3-Ag_2O（Ag_2O=10- 20mol%）为玻璃基片材料，采用10- 20 keV的离子辐照法制备了高含量的Ag_2 O掺杂玻璃基片，并在此基础上研究了离子辐照法制备量子尺寸颗粒的过程。用较低能量的N_2^+、Ar^+等离子辐照可以在玻璃表面附近析出高浓度的量子尺寸的Ag颗粒。通过FE-SEM和420 nm波长处等离子体吸收峰的强度和形状的数据直接估计它们的尺寸。为了测量X^<（3）>值，应增加Ag颗粒浓度。在此基础上，找到了合适的玻璃组成：P_2O_5-Al_2O_3-Ag_2O（15- 20mol%）-Na_2O（15- 20mol%）玻璃，其浓度是非Na_2 O玻璃的两倍。在450 nm波长下，用短脉冲激光简并四波混频（DFWM）测得样品的X_（3）= 5.5-8.8 × 10 ~（-1）<-7>esu。该技术对颗粒大小的精确控制正在进行中。