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We theoretically analyse the temperature effects on a surface plasmon resonance (SPR) sensor in Kretschmann configuration. The temperature effects include the thermo-optic effect and the dispersion of thermal-optic coefficient in the dielectric along with the thermal expansion effect, phonon-electron scattering and electron-electron scattering in the metal layer. We simulate the temperature dependence of the resonance position and the sensitivity of the SPR sensor under wavelength-interrogation and angular-interrogation mode of operation and the differences are pointed out in the two modes. 相似文献
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Ultra-low specific on-resistance vertical double-diffused metal-oxide semiconductor with a high-k dielectric-filled extended trench 下载免费PDF全文
An ultra-low specific on-resistance trench gate vertical double-diffused metal-oxide semiconductor with a high-k dielectric-filled extended trench(HK TG VDMOS) is proposed in this paper.The HK TG VDMOS features a high-k(HK) trench below the trench gate.Firstly,the extended HK trench not only causes an assistant depletion of the n-drift region,but also optimizes the electric field,which therefore reduces Ron,sp and increases the breakdown voltage(BV).Secondly,the extended HK trench weakens the sensitivity of BV to the n-drift doping concentration.Thirdly,compared with the superjunction(SJ) vertical double-diffused metal-oxide semiconductor(VDMOS),the new device is simplified in fabrication by etching and filling the extended trench.The HK TG VDMOS with BV = 172 V and Ron,sp = 0.85 mΩ·cm2 is obtained by simulation;its Ron,sp is reduced by 67% and 40% and its BV is increased by about 15% and 5%,in comparison with those of the conventional trench gate VDMOS(TG VDMOS) and conventional superjunction trench gate VDMOS(SJ TG CDMOS). 相似文献
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A multimode fiber-optic surface plasmon resonance(SPR) sensor with a MgF2 film as a modulated layer is studied.The fiber-optic SPR sensor is investigated theoretically,specifically the influence of the dielectric protecting layer,using a four-layer model.The sensor is then fabricated with the optimal parameters suggested by the theoretical simulation.The sensor has a high sensitivity in the analyte refractive index(RI) range of 1.33-1.40.The best sensitivity of 4 464 nm/RIU is achieved in the experiment.The use of dielectric film(MgF2) can not only modulate the resonance wavelength of the sensor,but also protect the silver film from oxidation. 相似文献
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增强荧光辐射在生物成像、高灵敏探测、集成光源等方面都具有重要的应用价值.金属纳米颗粒的周围或者金属纳米结构的间隙都可以产生强的电磁场,相应的,这些结构附近的局域态密度也被极大地增强.虽然增强荧光辐射已经在多种金属纳米颗粒和颗粒对中被证明,但是利用金属纳米结构对荧光分子的吸收和辐射过程同时进行调制仍然是一个有挑战的问题.本文研究了金属-介质-金属超表面对荧光辐射的调控,其中局域表面等离激元(LSP)和磁等离激元(MPP)分別与于分子的吸收和辐射过程发中耦合相互作用.对于吸收过程,LSP的耦合作用使得可以通过旋转泵浦激光的偏振态来实现荧光分子的空间选择激发.此外,MPP模式的偏振依赖特性使得矩形渔网结构中的荧光分子的辐射波长和偏振态也受到调控.实验观测结果经过了时域有限差分模拟的验证.本文报道的纳米结构在光辐射器件和纳米尺度集成光源等方面都具有潜在的应用价值. 相似文献
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Numerical Investigation of Surface Plasmons Associated Subwavelength Optical Single-Pass Effect 下载免费PDF全文
Surface plasmons (SPs) associated optical single-pass effect has been investigated in novel subwavelength metallic structures, including single slit and grating structures. With influence of SPs, these metallic structures can enhance transmission in incident direction and suppress it in the opposite direction, exhibiting a single-pass effect. The finite difference time domain method is employed to study the influences of structure parameters on far-field transmission, near-field electric field distribution and extinction ratio of the single-pass transmission effect. A maximal extinction ratio of 47.83dB is achieved in the grating structure. 相似文献
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微生物燃料电池(Microbial fuel cell,MFC)传感器检测水体毒性灵敏度偏低是阻碍其实际应用的瓶颈之一。本研究利用多壁碳纳米管(MWNT)和导电炭黑(GCB)修饰石墨毡(GF),作为阳极电极启动MFC传感器。考察了碳纳米材料修饰阳极电极对MFC传感器电化学性能及水体毒性检测灵敏度的影响。结果表明,GCB和MWNT修饰的电极比未修饰的电极内阻小,MFC的功率输出由大到小的顺序为:GCB/GF-MFC(2.63 W/m~2)MWNT/GF-MFC(2.56 W/m~2)GF-MFC(2.09 W/m~2)。以3,5-二氯苯酚(DCP)作为模型毒物进行毒性检测实验,10 mg/L DCP对3个MFC毒性传感器的平均抑制率为:MWNT/GF-MFC(31.8%)GCB/GF-MFC(26.3%)GF-MFC(20.1%),碳纳米材料修饰阳极电极组装MFC的毒性检测灵敏度均有所提高,MWNT/GF-MFC灵敏度最高。本研究对MFC型传感器在水污染预警中的实际应用研究提供了参考。 相似文献