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1.
激光诱导玻璃内部金纳米颗粒的析出及光谱 总被引:4,自引:0,他引:4
使用钛宝石飞秒激光引发和热处理相结合,实现了在含有金离子的硅酸盐玻璃内部,有空间选择性地析出金纳米颗粒。对吸收光谱的研究表明,随着热处理温度的升高,吸收峰强度增大且红移;随着激光功率密度的增大,金纳米颗粒也增大。在特定的激光和热处理条件作用下,可以在玻璃内部有空间选择性的使金离子还原后聚集,形成金纳米颗粒,具有量子尺寸效应。改变激光功率和热处理温度可以控制所析出的金属纳米粒子的尺寸,从而实现多色显示,飞秒激光诱导金纳米颗粒具有稳定性,颜色具有持久性。 相似文献
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将800nm高重复频率250kHz的飞秒激光分别聚焦到掺Ag和没有掺Ag的Gd2O3-MoO3-B2O3玻璃表面,研究掺Ag对飞秒激光诱导析晶的影响.对激光辐照的区域显微拉曼分析发现对于没掺Ag玻璃,诱导玻璃析晶需要的激光功率和辐照时间比掺了Ag的玻璃要大要长,这说明Ag的掺入促进了玻璃的析晶.其机理可能为飞秒激光的多光子吸收效应,导致玻璃基质中桥氧键断裂,产生非桥氧空穴和自由电子,玻璃中的Ag离子捕获电离出来的电子被还原成Ag原子,Ag原子在热动力的驱动下移动聚集形成银纳米颗粒,形成的银纳米团簇作为核促进了钼酸盐玻璃的析晶. 相似文献
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将800nm高重复频率250 kHz的飞秒激光分别聚焦到掺Ag和没有掺Ag的Gd2O3-MoO3- B2O3玻璃表面,研究掺Ag对飞秒激光诱导析晶的影响。对激光辐照的区域显微拉曼分析发现对于没掺Ag玻璃,诱导玻璃析晶需要的激光功率和辐照时间比掺了Ag的玻璃要大要长,这说明Ag的掺入促进了玻璃的析晶。其机理可能为飞秒激光的多光子吸收效应,导致玻璃基质中桥氧键断裂,产生非桥氧空穴和自由电子,玻璃中的Ag离子捕获电离出来的电子被还原成Ag原子,Ag原子在热动力的驱动下移动聚集形成银纳米颗粒,形成的银纳米团簇作为核促进了钼酸盐玻璃的析晶。 相似文献
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使用聚焦后的800nm,150 fs,250 kHz的高重复频率飞秒脉冲激光研究它在非掺杂氧化铋玻璃内部三维选择性的诱导析晶.通过拉曼光谱测定发现析出的晶体是TiO2且为金红石相.研究表明,经过250 kHz的飞秒激光辐照一段时间后,玻璃内部由于脉冲能量的连续累积会使得激光辐照区域出现热累积效应,达到玻璃的析晶温度后诱导晶体析出.通过连续移动激光束,可以实现连续刻写TiO2晶线,通过EDX测试显示聚焦区域出现了由于热累积效应而形成热驱动使得离子发生迁徙.实验结果表明这种方法适用于在透明介质材料中三维选择性刻写晶体以制备集成光学器件. 相似文献
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使用聚焦后的800nm,150fs,250kHz的高重复频率飞秒脉冲激光研究它在非掺杂氧化铋玻璃内部三维选择性的诱导析晶. 通过拉曼光谱测定发现析出的晶体是TiO2且为金红石相.研究表明, 经过250kHz的飞秒激光辐照一段时间后,玻璃内部由于脉冲能量的连续累积会使得激光辐照区域出现热累积效应,达到玻璃的析晶温度后诱导晶体析出.通过连续移动激光束,可以实现连续刻写TiO2晶线,通过EDX测试显示聚焦区域出现了由于热累积效应而形成热驱动使得离子发生迁徙.实验结果表明这种方法适用于在透明介质材料中三维选择性刻写晶体以制备集成光学器件. 相似文献
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光限幅材料在激光轰击过程中的稳定性将在很大程度上决定其实用化价值。文章采用红外(IR)光谱、拉曼(Raman)光谱、透射电子显微镜(TEM)及孔结构分析等测试方法对纳米碳管(CNTs)复合光限幅材料在激光轰击过程中组成、结构的演变进行跟踪研究。结果表明,在强激光轰击下,复合体系中二氧化硅(SiO2)基质的组成未发生显著改变且网络结构趋于完整,具有较好的稳定性。掺杂CNTs石墨化程度提高,SiO2凝胶玻璃基质对其起一定的保护作用。轰击过程产生的热效应使得SiO2颗粒长大,由其堆积而成的孔随之增大。 相似文献
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Seisuke Nakashima Koji Sugioka Katsumi Midorikawa Kohki Mukai 《Applied Physics A: Materials Science & Processing》2013,110(4):765-769
The optical property and the magneto-optical response were space-selectively modified in transparent Fe3+- and Au3+-doped glasses by using infrared femtosecond- (fs-) laser irradiation and subsequent annealing. This irradiation process induces the precipitation of not only magnetic spinel-type Fe-oxide nanoparticles but also Au nanoparticles inside the glasses, which shows localized surface plasmon resonance absorption at the wavelengths larger than 500 nm. As the annealing time and the temperature increases, the position of the LSPR peaks exhibits red shifts, which is due to the growth of Au nanoparticles. Faraday rotation angles as a function of wavelength were measured, and the difference spectra exhibit distinct positive peaks, indicating that the coupling between the LSPR due to the Au nanoparticles and the diamagnetism of the matrix glass is effective. To decrease the coupling with the diamagnetic glass, a two-step annealing process (at 450 °C for 90 min and at 550 °C for 30 min) was carried out after irradiation with fs-laser. The preliminary annealing at the lower temperature contributes to the precipitation of ferrimagnetic magnetite nanoparticles. Au nanoparticles were subsequently grown by annealing at 550 °C. In this case, effective coupling between the LSPR and ferrimagnetic nanoparticles has significantly suppressed the intensity of the positive peak in the Faraday spectra compared with the single annealing process. 相似文献
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Jongho Shin Kyungsik Jang Ki-Soo Lim Ik-Bu Sohn Young-Chul Noh Jongmin Lee 《Applied Physics A: Materials Science & Processing》2008,93(4):1015-927
We report the spectroscopic properties of femtosecond laser-irradiated sodium-alumino-borate glass doped with silver and gold
ions. We precipitated gold and silver nanoparticles by laser irradiation and annealing at 400°C for 30 min. The irradiation
and annealing treatment produced different absorption and emission characteristics in Au3+ doped and Au3+, Ag+ codoped glasses, and the possible mechanisms of the observed results are discussed. The size of the nanoparticles was estimated
by TEM and absorption band analysis. 相似文献
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We report on space-selective co-precipitation of silver and gold nanoparticles in Ag+, Au3+ co-doped silicate glasses by irradiation of femtosecond laser pulses and subsequent annealing at high temperatures. The color of the irradiated area in the glass sample changed from yellow to red with the increase of the annealing temperature. The effects of average laser power and annealing temperature on precipitation of the nanoparticles were investigated. A reasonable mechanism was proposed to explain the observed phenomena. 相似文献
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Nanoscale writing of Cu nanoparticles in glasses is introduced using focused electron irradiation by transmission electron microscopy. Two types of copper borosilicate glasses, one with high and another with low Cu loading, have been tested at energies of 200–300 keV, and formation of Cu nanoparticles in a variety of shapes and sizes using different irradiation conditions is achieved. Electron energy loss spectroscopy analysis, combined with high-resolution transmission electron microscopy imaging, confirmed the irradiation-induced precipitated nanoparticles as metallic, while furnace annealing of the glass triggered dendrite-shaped particles of copper oxide. Unusual patterns of nanoparticle rings and chains under focused electron beam irradiation are also presented. Conclusively, electron beam patterning of Cu-loaded glasses is a promising alternative route to well-established femtosecond laser photoreduction of Cu ions in glass. 相似文献
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A. L. Stepanov V. N. Popok D. E. Hole A. A. Bukharaev 《Physics of the Solid State》2001,43(11):2192-2198
Sodium calcium silicate glasses with Ag+ implanted ions are studied. The ion implantation conditions are as follows: the energy is 60 keV, the dose is 7×1016 cm−2, and the ion current density is 10 μA/cm2. Ion implantation provides the formation of a composite layer that incorporates silver nanoparticles in the surface region
of glass. The size distribution of nanoparticles over the depth in the composite layer is strongly nonuniform. The effect
of a high-power pulsed excimer laser on the composite layer is investigated. It is found that, under laser irradiation, the
size of silver nanoparticles in the implanted layer decreases but the size distribution of nanoparticles over the depth remains
nonuniform, even though it becomes slightly narrower compared to that observed prior to irradiation. The experimental results
are interpreted in terms of the effects of the melting of glass and metallic particles on a nanosecond scale.
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Translated from Fizika Tverdogo Tela, Vol. 43, No. 11, 2001, pp. 2100–2106.
Original Russian Text Copyright ? 2001 by Stepanov, Popok, Hole, Bukharaev. 相似文献
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We investigate sodium–calcium silicate glasses implanted with 60 keV Ag+ ions with a dose of 3·1016 cm–2 at an ion current density of 10 A/cm2. As a result of the ion implantation, a composite layer with silver nanoparticles is synthesized in the region near the surface. However, this layer is characterized by high nonuniformity in the size distribution of these particles over the depth of the layer. Subsequent pulsed laser irradiation in combination with equilibrium heat treatment makes it possible to modify this composite layer, improving the uniformity in the size distribution of the nanoparticles. This is particularly promising for the improvement of the technology of obtaining nonlinear optical materials. To control the parameters of the layers obtained we suggest a method based on an analysis of the optical reflection and transmission spectra measured on the side of the implanted and opposite surfaces of glass samples. 相似文献
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S. Jana R. Samanta M. Purkait 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2012,66(9):1-6
A series of silver nanoparticle embedded in erbium-doped tellurite glasses were synthesized using a one step melt-quenching method. Density and refractive index of glasses were measured. Thermal and optical characterizations were performed and plasmon bands of elliptical nanoparticles were observed. An enhancement of green (525 and 550 nm) and red (632 nm) lines in luminescence spectra of Er3+-doped silver-embedded tellurite glass was recorded and explained by energy transfer mechanism from silver nanoparticles to erbium ion in addition to enhanced local field in vicinity of metallic nanoparticles in the glass. The presence of nanoparticles was confirmed by transmission electron microscopy imaging and reduction of silver ions to silver neutral particles discussed through the redox potential estimation in probable reactions. Silver-erbium co-doped tellurite glass exhibits strong novel optical properties which nominate it as the promising glass for laser, color displays, and photonic applications. 相似文献
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K. V. Oreshkina V. D. Dubrovin A. I. Ignat’ev N. V. Nikonorov 《Optics and Spectroscopy》2017,123(4):590-596
The effect of silver on the optical, spectral-luminescent, and crystallization properties of bromide photo-thermo-refractive glasses is studied. Multicomponent photosensitive glasses of the Na2O–ZnO–Al2O3–SiO2 system with photosensitizing agents (cerium, antimony, silver) and halogenides (fluorine and bromine) are synthesized. Ultraviolet irradiation and thermal treatment below the glass-transition temperature of the glasses cause the formation of silver molecular clusters, which exhibit luminescence in the visible and infrared regions. UV irradiation and thermal treatment of glasses above the glass-transition temperature lead to the growth of silver nanoparticles with plasmon resonance peak in the region of 420 nm. Further thermal treatment of glasses above the glass-transition temperature shifts the plasmon-resonance maximum by 70 nm to longer wavelengths, which is related to the growth of a crystalline shell consisting of mixed silver and sodium bromides on nanoparticles. This formation of a crystalline phase on colloidal centers results in a local increase in the refractive index of the irradiated region by +Δn ~ 900 ppm compared to the nonirradiated region. Photo-thermo-refractive glasses with increased silver concentration are promising photosensitive materials for creating holographic optical elements and devices for line narrowing and stabilizing filters, spectral beam combiners, and filters for increasing the spectral brightness of laser diodes. A positive change in the refractive index of Photo-thermo-refractive glasses provides the possibility of recording in them 3D waveguide and integrated-optical structures. 相似文献
19.
Z.-C. Fu J. Dai T. Li H.-Y. Liu Q.-F. Dai L.-J. Wu S. Lan S.-L. Tie X. Wan A. V. Gopal V. A. Trofimov T. M. Lysak 《Applied physics. B, Lasers and optics》2012,108(1):61-66
Femtosecond laser ablation based on two-photon absorption was employed to cut ZnO nanorods into uniform ZnO nanoparticles of deep subwavelength size. The fabricated ZnO nanoparticles possess a shorter mean transport length for photons at the emission wavelength and a much smaller scattering cross section at the pump wavelength, leading to highly efficient two-photon-pumped random lasing with a low threshold of ??8?mJ/cm2. It was demonstrated that the significant enhancement in two-photon luminescence after the irradiation of femtosecond laser pulses could also be utilized for realizing optical data storage. 相似文献