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Enhancing surface plasmon polariton propagation by two-layer dielectric-loaded waveguides on silver surface |
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| Authors: | Ming-Yang Pan En-Hong Lin Likarn Wang Pei-Kuen Wei |
| Affiliation: | 1. Institute of Photonics Technologies, National Tsing Hua University, 300, Hsinchu, Taiwan 2. Research Center for Applied Sciences, Academia Sinica, 11529, Taipei, Taiwan 3. Institute of Biophotonics, National Yang-Ming University, 11221, Taipei, Taiwan 4. Institute of Optoelectronic Science, National Taiwan Ocean University, 20224, Keelung, Taiwan |
| Abstract: | We report a study of a two-layer dielectric-loaded surface plasmon polariton waveguide (TDLSPPW) which consisted of two dielectric layers (high-index/low-index) on a silver film. The discontinuity of the electric field at the interfaces resulted in a concentrated field in the low-index region. It efficiently reduced the propagation loss of the surface plasmon polariton mode. The mode fields and corresponding complex propagation constants were calculated by a vector finite-difference method. The propagation properties were measured by a modified near-field optical microscope. It is confirmed that the propagation length of the proposed TDLSPPW was about 1.6 times longer than conventional single-layer SPP waveguides. In addition, a 90° waveguide turn with 3 μm radius showed that the bending loss was smaller than 2 dB. |
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