共查询到20条相似文献,搜索用时 15 毫秒
1.
Tajima K. Ohashi M. Shiraki K. Tateda M. Shibata S. 《Lightwave Technology, Journal of》1992,10(11):1532-1535
The Rayleigh scattering and infrared absorption losses of P2 O5-F-doped silica glass, which is a candidate material for ultra-low-loss optical fiber, were investigated experimentally. The Rayleigh scattering loss of 8.5 wt.% P2O5 and 0.3 wt.% F-doped SiO2 glass is found to be 0.8 times that of pure silica glass. It is also found that the infrared absorption property of P2O5-F-SiO2 glass is almost the same as that of pure silica glass. The minimum loss for the proposed composition is estimated to be 0.11 dB/km at 1.55 μm wavelength, and 0.21 dB/km at 1.3 μm wavelength 相似文献
2.
Shibata S. Horiguchi M. Jinguji K. Mitachi S. Kanamori T. Manabe T. 《Electronics letters》1981,17(21):775-777
Loss minima in two fluoride glass and chalcogenide glass fibres were calculated. The intrinsic losses are predicted to be 1 × 10?3 dB/km at 3.4 ?m for BaF2-GdF3-ZrF4 glass fibre, 1 × 10?2 dB/km at 2.7 ?m for BaF2-CaF2-YF3-AlF3 glass fibre and 1 × 10?2 dB/km at 4.5 ?m for GeS3 glass fibre. 相似文献
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Howlader M.M.R. Suehara S. Takagi H. Kim T.H. Maeda R. Suga T. 《Advanced Packaging, IEEE Transactions on》2006,29(3):448-456
A sequential plasma activation process consisting of oxygen reactive ion etching (RIE) plasma and nitrogen radical plasma was applied for microfluidics packaging at room temperature. Si/glass and glass/glass wafers were activated by the oxygen RIE plasma followed by nitrogen microwave radicals. Then, the activated wafers were brought into contact in atmospheric pressure air with hand-applied pressure where they remained for 24 h. The wafers were bonded throughout the entire area and the bonding strength of the interface was as strong as the parents bulk wafers without any post-annealing process or wet chemical cleaning steps. Bonding strength considerably increased with the nitrogen radical treatment after oxygen RIE activation prior to bonding. Chemical reliability tests showed that the bonded interfaces of Si/Si could significantly withstand exposure to various microfluidics chemicals. Si/glass and glass/glass cavities formed by the sequential plasma activation process indicated hermetic sealing behavior. SiO/sub x/N/sub y/ was observed in the sequentially plasma-treated glass wafer, and it is attributed to binding of nitrogen with Si and oxygen and the implantation of N/sub 2/ radical in the wafer. High bonding strength observed is attributed to a diffusion of absorbing water onto the wafer surfaces and a reaction between silicon oxynitride layers on the mating wafers. T-shape microfluidic channels were fabricated on glass wafers by bulk micromachining and the sequential plasma-activated bonding process at room temperature. 相似文献
6.
Jung Jun Bae Seong Chu Lim Gang Hee Han Young Woo Jo Dinh Loc Doung Eun Sung Kim Seung Jin Chae Ta Quang Huy Nguyen Van Luan Young Hee Lee 《Advanced functional materials》2012,22(22):4819-4826
In spite of recent successful demonstrations of flexible and transparent graphene heaters, the underlying heat‐transfer mechanism is not understood due to the complexity of the heating system. Here, graphene/glass defoggers are fabricated and the dynamic response of the temperature as a function of input electrical power is measured. The graphene/glass defoggers reveal shorter response times than Cr/glass defoggers. Furthermore, the saturated temperature of the graphene/glass defoggers is higher than for Cr/glass defoggers at a given input electrical power. The observed dynamic response to temperature is well‐fitted to the power‐balance model. The response time of graphene/glass defogger is shorter by 44% than that of the Cr/glass defogger. The convective heat‐transfer coefficient of graphene is 12.4 × 10?4 W cm?2 °C?1, similar to that of glass (11.1 × 10?4 W cm?2 °C?1) but smaller than that of chromium (17.1 × 10?4 W cm?2 °C?1). The graphene‐based system reveals the lowest convective heat‐transfer coefficient due to its ideal flat surface compared to its counterparts of carbon nanotubes (CNTs) and reduced graphene oxide (RGO)‐based systems. 相似文献
7.
SiO2-B2O3 glass for the PANDA optical fibre is prepared from the colloidal sol-gel process. The preparation of SiO2-B2O3 glass is through the gellation of fumed silica dispersed in water containing boric acid. Two processes to dry the gel are examined, and freeze-drying is selected as the better drying method. The process produces a dried gel without cracks and with a uniform distribution of boron oxide concentration. The dried gel is sintered into glass 相似文献
8.
Shang‐lin Gao Rong‐Chuan Zhuang Jie Zhang Jian‐Wen Liu Edith Mäder 《Advanced functional materials》2010,20(12):1885-1893
A simple approach to deposit multiwalled carbon nanotube (MWNT) networks onto glass fiber surfaces achieving semiconductive MWNT–glass fibers is reported, along with application of fiber/polymer interphases as in‐situ multifunctional sensors. This approach demonstrates for the first time that the techniques of conducting electrical resistance measurements could be applicable to glass fibers for in situ sensing of strain and damage; the techniques were previously limited to conductive and semiconductive materials. The electrical properties of the single MWNT–glass fiber and the “unidirectional” fiber/epoxy composite show linear or nonlinear stress/strain, temperature, and relative humidity dependencies, which are capable of detecting piezoresistive effects as well as the local glass transition temperature. The unidirectional composites containing MWNT–glass fibers exhibit ultrahigh anisotropic electrical properties and an ultralow electrical percolation threshold. Based on this approach, the glass fiber—the most widely used reinforcement in composites globally—along with the surface electrical conductivity of MWNTs will stimulate and realize a broad range of multifunctional applications. 相似文献
9.
采用丝网印刷法制备了钡铁氧体厚膜,系统研究了玻璃粉含量对钡铁氧体厚膜磁性能的影响。结果表明,随着玻璃粉含量的增大,样品的致密度逐渐提高;饱和磁化强度、剩磁和矫顽力均呈现出先增大后减小的趋势;而剩磁比(Mr/Ms)单调上升。当玻璃粉含量增大到质量分数7%时,所制得样品的饱和磁化强度、剩磁和矫顽力均达到最大值,分别为151,76.6,310 kA/m。当玻璃粉含量为质量分数13%时,剩磁比达到0.615。 相似文献
10.
《Microwave Theory and Techniques》1982,30(10):1420-1438
A state of the art review of nonsilica based infrared fibers is presented. Two types of fiber materials have been investigated--crystals and glasses. Crystal fiber work appears to be focused on development of short haul CO/sub 2/ laser power delivering lines at 10.6 µm. The maximum delivering power of the CW CO/sub 2/ laser has reached up to about 100 W by the polycrystalline KRS-5 fiber. A number of glass fibers are being developed in fluorides, sulfides and heavy metal oxides. The best optical attenuation of each glass fiber has been respectively reduced to 21 dB/km at 2.55 µm for ZrF/sub 4/-based glass fiber with a core-clad structure, 78 dB/km at 2.4 µm for As-S unclad glass fiber, and 13 dB/km at 2.05 µm (70 dB/km at 2.40 µm) for GeO/sub 2/-Sb/sub 2/O/sub 3/ glass fiber with a core-clad structure. Recent progress of these infrared fibers offers great potential for new wavelength fiber finks operating in the 2-10 µm region which have not been realized by silica-based fiber. 相似文献
11.
Undoped fluoride glass slides have been exposed to pulsed 193-nm ultraviolet (UV) irradiation. Their absorption changes have been measured to evaluate UV-induced index changes using Kramers-Kronig relation. A layer-peeling polishing technique was applied to characterize the local UV-induced index change of highly absorbing glass. Index changes up to 1.75/spl times/10/sup -4/ have been evaluated with this method in fluorozirco-aluminate glass. Fluoroaluminate and fluorozirconate glass showed only small index changes of about 2.0/spl times/10/sup -6/ and 2.6/spl times/10/sup -6/ at a wavelength of 1550 nm. 相似文献
12.
We have examined the performance and hot-carrier stress reliability of n-channel polycrystalline silicon (poly-Si) thin film
transistors (TFTs) on RCA-leached glass. We have found out that the TFT’s performance and reliability are improved by RCA-leaching
of the glass when compared to TFTs on bare glass due to the formation of a silica-rich layer on the glass surface by the RCA-leaching.
The silica-rich layer acts as a barrier for impurity diffusion from glass as well as it modifies the poly-Si/glass interface
which determines the physical structure of the active poly-Si. 相似文献
13.
Watekar P.R. Songbae Moon Aoxiang Lin Seongmin Ju Won-Taek Han 《Lightwave Technology, Journal of》2009,27(5):568-575
An alumino-germano-silica glass fiber doped with silicon nanoparticles and erbium ions was fabricated using the modified chemical vapor deposition (MCVD) method. Optical properties of the glass fiber were investigated using a Judd-Ofelt analysis. It was found that incorporating silicon nanoparticles with erbium ions did not alter Er-related optical properties of the silica glass fiber. The incorporation of silicon particles in a fiber core caused wide band absorption from 480 nm to 1200 nm. A third order optical nonlinearity of the Si-Er-doped alumino-germano-silica glass fiber was measured to be about 3.8 x 10-15 m2/W. 相似文献
14.
Ramaswamy R.V. Srivastava R. Chludzinski P. Anderson T.J. 《Quantum Electronics, IEEE Journal of》1988,24(5):780-786
The Ag+-Na+ ion-exchange process in a soda-lime silicate glass was studied at 330° as a function of composition of AgNO3-NaNO3 melt, mixing condition, and exchange time. The concentration profile of silver in glass was measured by atomic absorption spectroscopy and SEM technique. The surface index change and the index profile were determined from mode index measurement. Ion-exchange was modeled by an ion-diffusion limited process in the glass with an equilibrium chemical reaction at the melt-glass interface. A large value of 75 for the equilibrium constant at low-silver melt concentrations (<10-2 mole fractions) shows that uptake of silver in glass varies in highly nonlinear fashion with the melt concentration. The results provide boundary conditions necessary for solution of the diffusion equation and design of single-mode waveguides 相似文献
15.
The first L-band EDFA to employ fluorophosphate glass as the host glass material has been realised. The lowest fibre loss yet reported for fluorophosphate glass fibre of 0.7 dB/m is achieved. The amplifier achieved a flat gain with an average value of 21.7 dB in the L-band. 相似文献
16.
The measured spectroscopic properties of Pr3+-doped into sulfide and fluoride hosts are used to model the gain efficiency of a 1300-nm Pr-doped fiber amplifier. It is found that excited-state absorption from the long-lived 3H5 level in Pr3+-doped sulfide glass causes a significant degradation in performance, especially at wavelengths shorter than 1320 nm, Pr3+ -doped fluoride glass does not suffer significantly from this effect, although the maximum gain is smaller in the fluoride glass 相似文献
17.
为了实现普通硅酸盐玻璃表面的金属化,利用波长为355nm的脉冲紫外激光刻蚀粗化活化,并结合化学镀,在其表面局域制备出了导电金属铜层。研究了激光加工参量对玻璃表面微观形貌、粗糙度、刻蚀深度的影响规律,并在玻璃表面成功引入了钯元素。结果表明,当第1次紫外激光扫描速率为200mm/s、脉冲频率为100kHz、能量密度为27J/cm2~37J/cm2和填充间距在10μm左右时,玻璃表面可以获得的刻蚀深度在25μm~35μm之间,刻蚀区域的粗糙度Ra在6μm~7μm之间,此时玻璃不会开裂;而第2次激光的能量密度在9J/cm2~11J/cm2之间时(其余参量不变),钯元素的引入实现了化学镀铜,此时铜层和玻璃之间的平均结合强度可以达到10MPa以上,铜层的体积电阻率可以达到10-6Ω·cm数量级。这是一种具有局域选择性、无需掩模、低成本、高结合强度和良好导电性的玻璃表面金属化工艺。 相似文献
18.
Yu-Chou Shih Yeong-Her Lin Jiun-Pyng You Frank G. Shi 《Journal of Electronic Materials》2013,42(3):410-416
In this study, silver pastes containing different sizes of glass frits were employed to form the front-side electrodes in order to examine the size effect of the glass frits on the interfacial microstructures between the front-side silver contacts and the n-type silicon emitter layers, which will subsequently affect the electrical performance of silicon solar cells. The interfacial microstructures at the Ag/Si interfaces were investigated by advanced electron microscopy techniques. The transfer length method (TLM) was used to measure the specific contact resistivity of silver electrodes screen-printed on the n-type silicon substrates. The particle size of the glass frits was found to strongly affect the interfacial microstructures and therefore resulted in different specific contact resistivities (ρ c) of the fabricated silver ohmic contacts. Nanosized glass frits showed excellent etching ability during engineered thermal treatments. The samples made with silver pastes containing microsized glass frits showed a thick residual glass layer at the Ag/Si interface, while the silver paste with nanosized glass frits was found to form an interface with less glass residue, which led to lower resistance after otherwise identical processing. 相似文献
19.
采用真空热蒸发以及退火工艺制备了支持局域表面等离激元的微纳结构薄膜,在此薄膜上蒸镀了硫系玻璃Ge28Sb12Se60薄膜。应用Z-扫描技术,在飞秒激光脉冲激发下研究其光学非线性增强的色散特性,在650 nm和850 nm波段观察到了非线性吸收增强;非线性折射率随着波长的增加由负变正。通过扫描电子显微镜和透过光谱表征和分析了硫系玻璃Ge28Sb12Se60薄膜非线性吸收增强的原理,非线性吸收随着波长的增加由单光子吸收为主逐渐转变为双光子吸收为主;银膜的微纳结构导致硫系玻璃薄膜的共振中心频率发生了偏移。实验制备的用于增强硫系玻璃非线性的微纳结构制作简单,无需复杂光刻工艺,为非线性光子学器件的设计提供了新的思路。 相似文献
20.
Sham-Tsong Shiue Kwang-Yi Chen 《Lightwave Technology, Journal of》1997,15(9):1669-1674
This work investigates the optimal design of double-coated optical fibers to minimize the mechanical strip force. As assumed, herein, the stripper consists of two hinged arms and paired blades with a semicircular bore, Analytical results indicate that the strip force is a function of the stripper's bore radius. The stripper's optimal bore radius attempts to make it close to the glass fiber radius. Notably, the stripper does not damage the glass fiber surface during the stripping process. Based on the type of strip force, the stripping process can be divided into two steps. In the first step, a strip force Ft must break the polymeric coatings and allow the crack on the cutting plane to extend to the glass fiber surface. In the second step, a strip force Fa must break the adhesive bond between the glass fiber and primary coating to remove the polymeric coatings away. The strip force Fa is independent of the stripping length. The strip force Fa and the work deemed necessary to strip the polymeric coatings are proportional to the adhesive stress between the glass fiber and primary coating. The shear strength of the primary coating should exceed the adhesive stress between the glass fiber and primary coating; otherwise, the primary coating cannot be stripped completely from the glass fiber surface. The strip force Fa can be minimized by appropriately selecting polymeric coatings and their thicknesses. To minimize such a strip force, the thickness and Young's modulus of the primary coating should be increased. On the other hand, the thickness and Young's modulus of the secondary coating should be decreased 相似文献