A plasmonic splitter with flexible power splitting ratio at optical fiber communication waveband

¹ State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China
² School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, P.R. China

^a e-mail: lang.peilin@gmail.com

Received: 26 April 2014
Revised: 20 August 2014
Accepted: 25 August 2014
Published online: 10 October 2014

Abstract

We present a plasmonic splitter based on metal-insulator-metal (MIM) structure. This splitter consists of two parallel waveguides and two resonators. One resonator is a ring tangentially connected with the two waveguides, and the other resonator is a semi-ring directly connected to the lower waveguide. The finite-difference time-domain (FDTD) method is used to numerically analyze the transmittance spectra of the splitter. The results show that this splitter is a beam splitter when the wavelength of the incident wave is around 1355 nm or 1553 nm. This splitter can also be regarded as a power splitter. To our knowledge, this is the first designed surface plasmon polaritons (SPPs) splitter which utilize both the communication wavelengths at around 1310 nm and 1550 nm. This characteristics show potential applications in future optical circuits.