排序方式: 共有120条查询结果,搜索用时 234 毫秒
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通过传统熔融淬冷技术制备Ge28Sb12Se60硫系玻璃,并由热蒸发技术制备出Ge28Sb12Se60非晶态薄膜,利用电感耦合等离子体(ICP)刻蚀机在不同刻蚀气体氛围下制备出Ge-Sb-Se硫系光波导.研究了不同刻蚀功率和不同刻蚀气体流量比等条件参数对制备所得Ge-Sb-Se波导表面形貌的影响,利用台阶仪测量其刻蚀速率,扫描电子显微镜(SEM)和扫描探针显微镜(SPM)测量波导形貌以及表面粗糙度.结果显示,对于相同组分材料的Ge-Sb-Se硫系薄膜,相比于CF4/O2刻蚀气体,CF4/CHF3混合刻蚀气体制备出的波导具有较低的表面粗糙度、较光滑的侧壁和较大的刻蚀选择比,1 550 nm处2μm宽波导传输损耗为(1.73±0.24)d B·cm-1. 相似文献
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We investigate the third-order optical nonlinearities in four novel porphyrin dimers (dimers A to D) and a monomeric porphyrin H2 CPTPP measured by using the single-beam z-scan technique with a pulsed Q-switched Nd:YAG nanosecond laser at 532nm. All the samples show strong excited state absorption (ESA) and high value of Х^(3) in the ns domain at this wavelength. We perform a comparison between dimer A and its monomer H2 CPTPP in their third-order optical nonlinearity, and discuss the relationships between the values of Х^(3) and the different bridging groups for all the dimers. 相似文献
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Fibre Optical Parametric Amplification in Defect Bragg Fibres with Zero Dispersion Slow Light Effect 下载免费PDF全文
Nonlinearity enhancement by slow light effect and strong light confinement in defect Bragg fibres is demonstrated and anMysed in applications of fibre optical parametric amplifiers. Broadband low group velocity and zero dispersion as well as the strong light confinement by band gap enhances the nonlinear coefficient up to more than one order than the conventional high nonlinear fibres. Moreover, the zero dispersion wavelength of coupled core mode can be designed arbitrarily, under which the phase-matching bandwidth of the nonlinear process can be extended. 相似文献
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193nm光刻曝光系统的现状及发展 总被引:1,自引:0,他引:1
投影曝光工艺是集成电路制造过程中的关键环节,曝光系统的工艺水平已成为衡量微电子制造技术的重要标志。重点介绍了目前193 nm光刻设备曝光系统的发展现状和趋势,以及为提高曝光质量所采用的相关分辨率增强技术;通过分析曝光系统的构成和其中的关键技术,探讨了国内研制相关曝光设备所面临的挑战。 相似文献
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章俊张培晴牛雪珂戴世勋张巍王训四聂秋华 《光学学报》2015,(4):244-251
稀土掺杂硫系玻璃是实现中红外发光的重要手段,通过在稀土掺杂硫系玻璃样品上构造光子晶体结构可以大大增强其发光效率。制备了Tm3+离子掺杂硫系玻璃样品并测试了其光谱特性,通过设计光子晶体结构来增强Tm3+离子跃迁产生的3.73 mm处的荧光强度。利用有限时域差分法(FDTD)进行运算,模拟结果表明,通过优化设计的光子晶体结构参数,掺杂样品在3.73 mm处的光子态密度相比于未采用光子晶体结构所产生的光子态密度有极大提高,计算其Purcell放大因子可达到未进行结构设计的50倍以上。光子态密度的极大提高以及Purcell放大因子为增强发光强度提供了理论依据,该研究结果对实现高效率中红外光源器件具有重要的指导意义。 相似文献
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The electric and magnetic energy distributions in photonic crystals (PC) are calculated by using the plane wave expansion (PWE) method. Even though the total electric and magnetic energy in each unit cell of photonic crystals are equal to each other, the ratio of electric and magnetic energy densities varies depending on the local position. Based on Fermi's golden rule, the optical gain is analysed in the full quantum framework that takes the nonuniform energy density ratio into account. This nonuniform energy density ratio in photonic crystals, defined in an equal form as gain modification factor, leads to spatially inhomogeneous modification of optical gain. Results reported in the paper provide a new perspective for analysing gain characteristics, as well as the lasing properties, in photonic crystals. 相似文献
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Extending span distance is an important way to reducethe cost of long-haul dense wavelength division multi-plexing (DWDM) systems. In traditional DWDM sys-tems based on erbium-doped fiber amplifiers (EDFAs),span distance is about 80—100 km. Quantum limitationin noise figure (NF) of EDFAs (3 dB) prevents furtherextension of span distance with acceptable costs on trans-mission distance. capacity, and performance. Distributedfiber Raman amplifiers (DFRAs) have been proven tohave better… 相似文献
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