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While varying the incident light polarization, the spatial distribution of the PL intensity in the nanogap of an Au bowtie changed as predicted by the simulation results on the electromagnetic field enhancement distribution.
The local field intensity enhancement distribution E/E0 in the logarithmic scale due to the presence of Ag NPs was simulated using the finite-difference time-domain method, as shown in Figure 4a.
Open image in new window Fig. 3 a Electric (|E|2/|Einc|2, black curve) and magnetic (|H|2/|Hinc|2, red curve) field intensity enhancement distribution along the x-direction at xy-plane, where y = 0.
Figure 4 (a) The local field intensity enhancement distribution E/E 0 in the logarithmic scale due to the presence of the equilateral triangular Ag NP island with 120 nm edge lengths and the incident wavelength is 480 nm.
Figure 4b shows the electric field intensity enhancement distribution along the wall of the bowtie antenna (through the z-direction, where x = 25 nm), which demonstrates that the strongly concentrated local electromagnetic fields extend deep into the water and glass medium and gradually decrease with the distance along ±z-direction.
For example, Fang et al. [39] showed that the enhancement distribution could vary between 2.8 × 104 and 4.1 × 1010, where the hot spots accounted for 0.0063% of the total number of sites examined but contributed about 24% to the average SERS intensity.
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The enhancement distributions of all possible inter- and intracontacts were used as backgrounds.
From the enhancement distributions shown in Fig. 3, both for inter- and intrachromosomal chimaeric transcripts, a shift towards larger enhancement can be seen with either kind of restriction enzyme.
The enhancement-distribution histograms of three representing regions: eyeball, muscle and a blood vessel are calculated in order to determine BBB breakdown enhancement range for each individual subject.
b Electric field intensity enhancement (|E|2/|Einc|2) distribution along the gold/glass interface calculated at the resonance wavelength of the bowtie response (~793 nm) under an x-polarized light source (depicted in the figure with a white arrow).
d Magnetic field intensity enhancement (|H|2/|Hinc|2) distribution along the gold/glass interface calculated at the resonance wavelength of the bowtie response (~793 nm) under an x-polarized light source (depicted in the figure with a white arrow).
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Justyna Jupowicz-Kozak
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