Plasmonic tunable filter based on trapezoid resonator waveguide

Abstract

2015): Plasmonic tunable filter based on trapezoid resonator waveguide, Journal of Modern Optics,The metal-insulator-metal waveguide structures coupled with a trapezoid cavity are proposed in theory. A variety of transmission features have been found from the simulation results, which is caused by the interference of the plasmonic modes in the trapezoid resonator. The transmission spectra can be effectively modulated by optimizing the geometrical parameters of our configurations such as the height, the upper and bottom edge lengths. Also, the coupling distance possesses great importance on the transmission characteristic. It is found that when the coupling distance is chosen to be around 20 nm, the filter works efficiently. When the trapezoid resonator is attached to the waveguide bus, the bandwidth becomes large. Besides, an effective band-stop filter can be achieved when the bottom edge length is large enough. The finite element method is carried out to verify our designs. We hope our work may open some new avenues for a high-performance plasmonic filter.

Plasmonic induced transparency in a coupled system composed of metal-insulate-metal stub and trapezoid cavity resonator

“…where ε ∞ is the relative permittivity at infinite frequency with the value of 3.7, ω p is the plasma frequency which is set as 1.38×10 16 Hz, γ is the damping frequency of the oscillations and the value is 2.73×10 13 Hz, and ω is the angular frequency of the incident light [19]. The transmission spectrum and resonance modes at different wavelengths were investigated with the parameters set as: L 1 =50nm, L 2 =250nm, H =300nm and g =20nm.…”

“…On the basis of these designs, some new structures were proposed to implement more functionality by modulating the offset positions of resonators [14] or rotating the angles of the ring resonators [15]. Recently, Song et al proposed a trapezoid resonator which shows novel transmission properties and mode distributions [16]. In Song's paper, they discussed the dependence of transmission spectra and resonance wavelengths on the parameters of the trapezoid resonator.…”

Sensing Features of the Fano Resonance in an MIM Waveguide Coupled with an Elliptical Ring Resonant Cavity

“…SPP is a phenomenon in which incident photons are coupled with electrons that are free in the surface of the conductor [4,5]. In recent years, researchers have proposed a large number of devices related to MIM waveguides to realize a variety of instruments that have different functions, such as filters [6][7][8][9][10][11], splitters [12,13], sensors [14][15][16][17][18][19][20][21], and they greatly promote the development of novel instruments.…”

Transmittance of MIM Waveguides Containing Semi-Circular Ring Shaped and Rectangular Ring Shaped Grooves

“…Owing to the fact that surface plasmon waves are confined to the metal-dielectric interface, refractive index sensors [10], DNA sequencing structures [11], plasmonic nanoloop arry antenas [12] have been proposed and investigated theoretically or experimentally. Various structures for filtering an optical wavelength in plasmonic structures have been proposed and studied such as: a tooth shaped frequency filter which is an MIM waveguide with a rectangular groove [13], a brag reflector which is an MIM waveguide containing rectangular grooves with different heights [14], the MIM waveguides with triangular grooves [15], and the trapezoidal resonator waveguide [16]. In these structures, groove dimensions and the material inside the groove are important, because variation in the dimensions and material affect the effective index of the groove, and the amount of the power entered into the groove [17].…”

“…In the reported MIM waveguide structures containing grooves for filtering purposes [13][14][15][16], the grooves interact through one edge with the wave propagating inside the MIM waveguide in the straight direction. It is expected that if grooves are designed so that the grooves interact with the wave through two edges, then the efficiency would be enhanced.…”