In-line rainbow trapping based on plasmonic gratings in optical microfibers

Guan, Chunying, Shi, Jinhui, Ding, Ming, Wang, Pengfei, Hua, Ping, Yuan, Libo and Brambilla, Gilberto (2013) In-line rainbow trapping based on plasmonic gratings in optical microfibers. Optics Express, 21 (14), 16552-16560. (doi:10.1364/OE.21.016552).

Abstract

In-line rainbow trapping is demonstrated in an optical microfiber with a plasmonic grating. The dispersions of x- and y-polarized surface plasmon polariton (SPP) modes are analyzed in detail by the 3D finite element method (FEM). In this system, the incident light is coupled from an optical microfiber into a graded grating. The plasmonic structure shows strong localization as the dispersion curve approaches cut-off frequency. Gradually increasing the depth or width of the grating elements ensures that the cut-off frequency of the SPP mode varies with the position along the microfiber. Near-infrared light at different frequencies can be trapped in different spatial positions. The in-line rainbow trapping is important for potential applications including optical storage, slow light, optical switch and enhanced light-matter interactions in fiber integrated devices and highly integrated optical circuits.

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Contributors

Author: Gilberto Brambilla

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