共查询到15条相似文献,搜索用时 46 毫秒
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超导纳米线单光子探测器件(SNSPD)是超导单光子探测系统的核心器件。文中介绍了成功制备的基于5nm厚的NbN超导超薄薄膜的SNSPD器件。器件核心结构为150nm宽的纳米曲折线结构,纳米线条占空比为75%,面积为20μm×20μm。超导纳米线是利用电子束曝光(EBL)技术和反应离子刻蚀(RIE)等工艺技术制备的。所制备的SNSPD样品,在温度3.5K下的临界电流约12.9μA;在1310nm波长光波辐照,12.5μA的偏置电流下,探测效率约0.016%。 相似文献
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为了降低光学表面的菲涅耳反射,提出了一种制备仿生减反结构的方法.利用银镜反应并结合退火处理在硬性材质基底表面制备银纳米粒子,经反应离子刻蚀工艺,在基底表面形成一层纳米蛾眼减反结构.分析了周期分布和随机分布纳米蛾眼的光学特性,实验研究了退火参量和刻蚀参量对银纳米颗粒直径、密度以及高度的影响,并在硅和石英基底上分别制备了随机减反结构.测试结果表明:硅基平均反射率小于4.5%,双面石英基透过率达98.1%.理论和实验均表明:随机分布的纳米仿生蛾眼结构具有宽光谱、广视角和高减反特性,所提出的制备方法具有简便易行、低成本、大幅面等优点,在光电器件中具有良好的潜在应用前景. 相似文献
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基于高定向热解石墨晶体(highly oriented pyrolitic graphite,HOPG)研制了一种新型反射式X射线谱仪.该谱仪具有高反射效率、较高能谱分辨率及相对较宽的能谱测量范围.根据计算,在相同的入射条件下,该谱仪的效率比一般X射线弯晶谱仪高3个量级;谱仪能谱分辨率理论值最高达350;理论探测范围是6.891keV至9.193 keV.我们将该谱仪应用在高功率密度激光与固体靶相互作用的实验中,发现在普通弯晶谱仪无法采到信号的实验条件下,HOPG谱仪依然采集到清晰的Cu K谱线.分析发现在8.048 keV(Cu的Kα光子能量)附近的能谱分辨能力最高达到40 eV,分辨率大于200. 相似文献
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基于产线工艺制备了纳米绒面多晶硅太阳电池,并表征其光电转换性能。研究结果表明:相对传统微米绒坑,纳米绒面能够提升多晶硅太阳电池的短路电流,相应的光电转换效率绝对值提升大于0.4%,产线均值光电转换效率超过了19.1%。结合漫反射光谱和外量子效率测试结果,改进的光电转换的原因归结为纳米绒面能够有效地诱捕短波和长波太阳光子,增强短波和长波太阳光响应。本研究证实纳米绒面多晶硅太阳电池可利用产线工艺制备且具有较高的光电转换效率,能够实现产业化。 相似文献
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Highly oriented pyrolytic graphites are irradiated with 40.5-Me V and 67.7-Me V ^112Sn-ions in a wide range of fluences: 1×10^11 ions/cm^2–1×10^14ions/cm^2. Raman spectra in the region between 1200 cm^-1 and 3500cm^-1 show that the disorder induced by Sn-ions increases with ion fluence increasing. However, for the same fluence, the amount of disorder is greater for 40.5-Me V Sn-ions than that observed for 67.7-Me V Sn-ions, even though the latter has a slightly higher value for electronic energy loss. This is explained by the ion velocity effect. Importantly, ~ 3-cm^-1frequency shift toward lower wavenumber for the D band and ~ 6-cm^-1 shift toward lower wavenumber for the 2D band are observed at a fluence of 1×10^14 ions/cm^2, which is consistent with the scenario of radiation-induced strain. The strain formation is interpreted in the context of inelastic thermal spike model, and the change of the 2D band shape at high ion fluence is explained by the accumulation of stacking faults of the graphene layers activated by radiation-induced strain around ion tracks. Moreover,the hexagonal structure around the ion tracks is observed by scanning tunneling microscopy, which confirms that the strains near the ion tracks locally cause electronic decoupling of neighboring graphene layers. 相似文献
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利用聚焦离子束刻蚀方法和电子束制版结合干法刻蚀方法制备了二维近红外波段光子晶体,发现两种方法都可以制备出均匀的二维光子晶体,聚焦离子束方法操作简单,电子束制版结合干法刻蚀方法操作步骤复杂.光谱测试表明,利用聚焦离子束方法在有源材料上刻蚀的光子晶体不发光,而电子束制版结合干法刻蚀方法制备的小晶格常数光子晶体即使有些无序,其出光效率也提高到没有光子晶体时的两倍.对两种方法所加工的光子晶体不发光和提高出光效率的机理进行了分析.
关键词:
聚焦离子束
电子束制版
光子晶体
出光效率 相似文献
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The angular intensity distribution of thermal energy He beam scattered from highly oriented pyrolytic graphite (HOPG) surface has been measured by means of supersonic molecular beam scattering technique in the wide surface temperature range. To separate the elastic and inelastic scattering components, simple analysis method has been developed by applying the classical binary collision theory of the hard cube model (HCM). From the extracted elastic scattering component in the scattering distribution, the Debye temperature of the HOPG surface has been derived as 590 ± 30 K. On the basis of the HCM analysis for the extracted inelastic scattering components of He beam, the effective mass for the HOPG surface has been found to be 72 u (six carbon atoms). 相似文献