Highly Sensitive Surface Plasmon Resonance Based D-Shaped Photonic Crystal Fiber Refractive Index Sensor
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...55 × 10−5, which is comparable with [8,12,16,18,28]....
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...Another hexagonal lattice D-shaped PCF sensor, where a gold layer was deposited on the flat surface to obtain SPR phenomena, has been proposed [16]....
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...Figure 2 shows the resonance spectrum and the electric field distribution of the fundamental core guided mode, SPP mode, and the coupling mode at the analyte having RI na = 1.44. In Fig. 2a, the blue line shows the real part of the effective index (Re(neff)), green line represents the SPP mode neff and pink line shows the Im(neff) of the y-polarized fundamental core mode. At the resonant wavelength (1.23 μm), the effective index of the core guided fundamental mode and SPP mode coincide, and at this wavelength a sharp loss peak is observed. This shows Fig. 1 Cross section of the proposed D-shaped photonic crystal fiber 1368 Plasmonics (2017) 12:1367–1372...
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