Abstract

A ring-core photonic crystal fiber (PCF) embedded composite gold nanowire is proposed to propagate single TE01 mode cylindrical vector beam. The ring-core PCF mainly supports six low loss modes including x-polarized fundamental mode, y-polarized fundamental mode, TE01 mode, TM01 mode, HE21-e and HE21-o modes. By introducing the composite gold nanowire into the center of the ring-core PCF, only the TE01 mode can propagate through the fiber with a low loss; while the other modes suffer a high loss due to the surface plasmon resonance (SPR). Numerical results demonstrate that the ring-core PCF embedded with two-shell structured composite gold nanowire has large loss ratios of the other modes to TE01 mode. The loss ratios are greater than or equal to 50 within the wavelength range from 1.3 to 1.39 μm. It indicates that single TE01 mode cylindrical vector beam can be obtained by using the ring-core PCF based on SPR, which makes the fiber have a great potential in laser processing, nanotechnology, high resolution imaging and optical capture.

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