In this letter, we propose and analyze an ultra-compact wavelength filter on silicon-based hybrid plasmonic waveguides, which confines light in a nanometeric silica dioxide layer between the silicon substrate and metal cap. The filter consists of a stub structure coupled to a straight waveguide. The three-dimensional finite-difference time-domain (FDTD) method is applied to calculate the spectral responses of such devices. Similar resonant behaviors are obtained since those devices are based on two-dimensional Metal-Insulator-Metal waveguide structure. Results also show that by adding stubs and tuning the distance between stubs can further improve the device’s performance and shape the spectral response to some extent.
© 2012 Optical Society of America
Original Manuscript: January 17, 2012
Revised Manuscript: March 13, 2012
Manuscript Accepted: March 27, 2012
Published: May 15, 2012
N. Zhu and T. Mei, "Analysis of an ultra-compact wavelength filter based on hybrid plasmonic waveguide structure," Opt. Lett. 37, 1751-1753 (2012)