Ultra-wideband surface plasmonic Y-splitter
Xi Gao,
1,2
Liang Zhou,
3
Xing Yang Yu,
1
Wei Ping Cao,
1
Hai Ou Li,
1
Hui Feng Ma,
2
and
Tie Jun Cui
2,*
1
School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China
2
State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing
210096, China
3
Guangzhou Haige Communication Group Incorporated Company, Guangzhou 510663, China
*
tjcui@seu.edu.cn
Abstract: We present an ultra-wideband Y-splitter based on planar THz
plasmonic metamaterials, which consists of a straight waveguide with
composite H-shaped structure and two branch waveguides with H-shaped
structure. The spoof surface plasmonic polaritons (SSPPs) supported by the
straight waveguide occupy the similar dispersion relation and mode
characteristic to the ones confined by the branch waveguides. Attributing to
these features, the two branch waveguides can equally separate the SSPPs
wave propagating along the straight plasmonic waveguide to form a 3dB
power divider in an ultra-wideband frequency range. To verify the
functionality and performance of the proposed Y-splitter, we scaled down
the working frequency to microwave and implemented microwave
experiments. The tested device performances have clearly validated the
functionality of our designs. It is believed to be applicable for future
plasmonic circuit in microwave and THz ranges.
OCIS codes: (050.6624) Subwavelength structures; (230.7390) Waveguides, planar;
(240.6680) Surface plasmons.
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Received 19 Jun 2015; revised 13 Aug 2015; accepted 18 Aug 2015; published 26 Aug 2015
7 Sep 2015 | Vol. 23, No. 18 | DOI:10.1364/OE.23.023270 | OPTICS EXPRESS 23270