Tunable band-pass plasmonic waveguide filters with nanodisk resonators

Abstract

A novel and simple plasmonic filter based on metal-insulator-metal plasmonic waveguides with a nanodisk resonator is proposed and investigated numerically. By the resonant theory of disk-shaped nanocavity, we find that the resonance wavelengths can be easily manipulated by adjusting the radius and refractive index of the nanocavity, which is in good agreement with the results obtained by finite-difference time-domain (FDTD) simulations. In addition, the bandwidths of resonance spectra are tunable by changing the coupling distance between the nanocavity and waveguides. This result achieved by FDTD simulations can be accurately analyzed by temporal coupled mode theory. Our filters have important potential applications in high-density plasmonic integration circuits.

All Optical Logic Gates Based on Two Dimensional Plasmonic Waveguides with Nanodisk Resonators

“…The material-dependent constants ωp and γ are the bulk plasma and damping angular frequencies, respectively. The Drude parameters for silver can be assumed as ε∞ = 3.7, γ = 0.018eV, and ωp = 9.1eV [29]. We can solve Eqs.…”

“…as it is common in digital systems and includes a wide spectrum of frequency. In fact the proposed structure can play as a band-pass filter at the resonance wavelengths of the nanodisk [29]. Therefore, if we apply pulse sources, only the wavelengths corresponding to the resonance wavelengths can transmit to the outputs of the gates.…”

“…Recently, some plasmonic structures based on the nanodisk resonators such as filters and demultiplexers have been investigated [11,13,[29][30][31]. In this paper, some basic plasmonic logic gates of XOR, XNOR, NAND, and NOT, in simple plasmonic structures with nanodisk resonators are proposed and investigated numerically and analytically.…”

Numerical Investigation of Tunable Band-pass\band-stop Plasmonic Filters with Hollow-core Circular Ring Resonator

“…In previous works, by varying the outer dimensions of the structure, i.e. cavity length or radius, tunable filters were achieved [21][22][23]. But in this paper, we want to tune the resonant wavelengths of circular ring resonator plasmonic filters, without changing the outer size of the structure.…”

Tunable Nanoplasmonics

“…In addition, tuning mechanism using liquid crystal waveguide is proposed in [20]. Other filtering techniques are proposed in [21], [22]; however, these techniques lack the ability of tuning in easy and accurate manner…”