Double and triple-wavelength plasmonic demultiplexers based on improved circular nanodisk resonators

Abstract

Plasmonic demultiplexers using improved circular nanodisk resonators (CNRs) and metal-insulatormetal waveguides have been designed. The proposed structures use air and silver as insulator and metal layers, respectively. The relative permittivity of silver has been characterized by Drude, Palik, and Drude-Lorentz models in our finite-difference time-domain simulations. To obtain demultiplexers, first two filters based on improved CNRs are designed. One of the most outstanding features of a CNR is that the resonance wavelength can be tuned by changing its radius. It is shown that increasing the CNRs radii for the single-mode bandpass filter increases the resonance wavelength, linearly. Accordingly, double and triple-wavelength demultiplexers (DeMuxes) have been proposed for the wavelength range of 600 to 2000 nm. Due to their small area, the proposed demultiplexers can be applied in integrated optical circuits for optical communication purposes.

Tunable single‐mode bandpass filter based on metal–insulator–metal plasmonic coupled U‐shaped cavities

“…Since the 3D simulations are more complex and more time-consuming, 2D simulations are often used for their reduced calculation time and relative simplicity. Using 2D structures for plasmonic filters is therefore a very prevalent approach [46][47][48][49][50], where most of such structures can be generalised to 3D configurations with finite thicknesses. Accordingly, the proposed plasmonic BPFs are also designed based on 2D simulations.…”

Optical biosensors using plasmonic and photonic crystal band-gap structures for the detection of basal cell cancer

“…The insulator layer is air with , and the metal layers are silver. The complex relative permittivity of silver is characterized by the Drude model 59 : where ε ∞ = 3.7 is the medium dielectric constant for the infinite frequency, ω p = 1.38 × 1016 Hz presents the bulk plasma frequency, ɤ = 2.73 × 1013 Hz denotes the electron collision frequency, and ω is the angular frequency of incident light.

Figure 1 3D topology of the initial structure.

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Refractive Index Sensor Based on a Metal-Insulator-Metal Bus Waveguide Coupled with a U-Shaped Ring Resonator

“…When the size of a specific nanostructure is reached, SPPs can break through the limited conventional diffraction and control light on the nanoscale [ 3 , 4 ]. SPPs have three characteristics: low dimension and high intensity and subwavelength, which make them a good energy and information carrier, and their ability to combine subwavelengths can be used to make various optical devices [ 5 ], such as wavelength demultiplexers [ 6 , 7 ], plasmonic filters [ 8 , 9 ], logic gates [ 10 ], couplers [ 11 ], and sensors [ 12 , 13 ].…”