��=8.686?2��?Im[neff](dB/m)(2)This article uses the mode power attenuation coefficient �� to quantify the loss of the transmission mode, and use dB/m as the Erlotinib HCl unit. Generally, the refractive index of the analyte na decides the resonance wavelength. When the incident light reaches the interface between two different media, it can cause metal free electronic resonance. Inhibitors,Modulators,Libraries SPR will change with the index of refraction of the Inhibitors,Modulators,Libraries surface change, so the SPR is so sensitive to environmental changes. The relationship between wavelength and attenuation constant of the fundamental mode of the grapefruit PCF filled with one silver nanowire of 300 nm radius is shown in Figure 2, we can get two loss peaks, which are located at 310 nm (peak I) and 635 nm (peak II) when na = 1.33 (red solid curve).
It is noteworthy that Inhibitors,Modulators,Libraries the resonance peak shift of peak I is 1 nm, and that of peak II is 12 nm. It is obvious that the peak II is more sensitive than peak I. This can be explained by noting that the silver nanowire surface supports several waveguide modes which result in several peaks. Peak I is the coupling between the high-order mode and the core guided mode Inhibitors,Modulators,Libraries and peak II is the coupling between the fundamental waveguide mode and the core guided mode. In the next section we only focus on the peak II for sensing.Figure 2.Relationship between wavelength and attenuation constant of the fundamental mode of the grapefruit PCF occupied by one silver nanowire of 300 nm radius, and the fundamental mode at peak I (the origin of the resonance peak is 310 nm) and peak II (the origin …
The relationship between wavelength and attenuation constant of the fundamental mode of the peak II is shown in Figure 3(a). The red and blue curves represent samples with refractive indexes of 1.33 and 1.335, respectively. The Cilengitide sharp loss peak is in the range of 630�C650 nm. Because the fiber core and surface plasmon mode can produce resonance, the energy of light field in the core has a great loss. When the sample refractive index changes from 1.33 to 1.335, the resonance peak shifts 12 nm (��?peak) towards the longer wavelength.Figure 3.(a) Relationship between wavelength and attenuation constant of the fundamental mode of the grapefruit PCF occupied by one silver nanowire of 300 nm radius. The red and blue curves represent the refractive indices of the samples which are 1.33 and 1.335, …If the spectral variation of 0.
1 nm can be accurately detected, we can get the corresponding refractive index resolution as [1]:R=��na����min/����peak=4.17��10?5RIU(3)The MDV3100 power detection sensitivity for the refractive index variation ��na can be defined as [1]:S(��)=1��(��,na)?��(��,na)?na(4)We can get the maximal sensitivity at 647 nm, and equals 178 RIU?1. It is typically a safe assumption that a 1% change in the transmitted intensity can be detected reliably, which leads to a sensor resolution of 5.62 �� 10?5 RIU.2.2.