Plasmonic Waveguide Filters Based on Tunneling and Cavity Effects
- 530 Downloads
This work presents a bandstop plasmonic filter that comprises a metal–insulator–metal (MIM) waveguide and a few pairs of strip cavities that are embedded in the metal. The strip cavity acts as both a near-field antenna and an MIM resonator. The central frequency and the bandwidth of the forbidden band are inversely related to the cavity length and the cavity-to-waveguide distance, respectively. These results correlate with the predictions of the ring resonator model but only under the resonant condition that double the effective length of cavity is an integer multiple of the guiding wavelength in the cavity.
KeywordsPlasmonic filter Strip cavity Metal–insulator–metal
This work was supported by the National Science Council of the Republic of China under contract numbers NSC98-2112-M-006-005-MY3 and NSC99-2120-M-002-012. The National Center for High-Performance Computing of Taiwan and the Computer and the Network Center of National Cheng Kung University are also acknowledged for uses of high-performance computing facilities.
- 1.Raether H (1988) Surface plasmons on smooth and rough surfaces and on gratings. Springer, BerlinGoogle Scholar
- 2.Maier SA (2007) Plasmonics: fundamentals and applications. Springer, New YorkGoogle Scholar
- 21.Taflove A, Hagness SC (2005) Computational electrodynamics: the finite-difference time-domain method, 3rd edn. Artech House, NorwoodGoogle Scholar
- 23.Pozar DM (1998) Microwave engineering. Wiley, New YorkGoogle Scholar