Title :
Surface Plasmon Interferometer Based on Wedge Metal Waveguide and Its Sensing Applications
Author :
Ming, Yang ; Wu, Zi-jian ; Wu, Hao ; Xu, Fei ; Lu, Yan-qing
Author_Institution :
Nat. Lab. of Solid State Microstructures, Nanjing Univ., Nanjing, China
Abstract :
We propose a surface plasmon interferometer based on a wedge metal waveguide. Working principles of the device are introduced through theoretical analyses. The interference performances are investigated by finite-difference time-domain (FDTD) method. Because of the special wedge geometry, the interferometer shows an extremely low coupling loss in comparison with the previous reports. An interesting surface plasmon polariton (SPP) coupling and splitting phenomenon is found at the wedge section. It is then split into two surface plasmon modes in two interference arms. Refractive index sensing applications of this interferometer are also discussed, which shows sensitivity as high as 6 × 103 nm/RIU.
Keywords :
finite difference time-domain analysis; light interference; light interferometers; optical losses; optical sensors; optical waveguides; polaritons; refractive index measurement; surface plasmon resonance; coupling loss; finite-difference time-domain method; interference performances; refractive index sensing; splitting phenomenon; surface plasmon interferometer; surface plasmon polariton; wedge geometry; wedge metal waveguide; Couplings; Gold; Interference; Plasmons; Propagation constant; Refractive index; Sensors; Sensors; plasmonics;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2012.2186562
