Wavelength demultiplexing structure based on arrayed plasmonic slot cavities

Abstract

A compact wavelength demultiplexing structure based on arrayed metal-insulator-metal (MIM) slot cavities is proposed and demonstrated numerically. The structure consists of a bus waveguide perpendicularly coupled with a series of slot cavities, each of which captures SPPs at the resonance frequency from the bus waveguide and tunes the transmission wavelength by changing its geometrical parameters. A cavity theory model is used to design the operating wavelengths of the structure. Moreover, single band transmission of each channel and the adjustable transmission bandwidth can be obtained by altering the drop waveguide positions and the coupling distance. The proposed arrayed slot cavity-based structure could be utilized to develop ultracompact optical wavelength demultiplexing device for large-scale photonic integration.

Plasmonic Filter and Demultiplexer Based on Square Ring Resonator

“…Obviously, for a particular wavelength we can obtain a φ to indicate the incident light and reflected light constructive interfered by changing l. From FDTD, the drop efficiency at 1310 nm can be enhanced to 64% when l = 34 nm, but the FWHM is also improved to 67 nm, as given in Figure 3b. This outcome is comparable with some previous works [4][5][6][7][8][9]. A monitor is set behind the source to detect the reflection, showing that the reflection is only approximately 3% at the drop wavelength, as depicted in Figure 3b.…”

“…Compared with previous works [7][8][9], this device has comparable performance. Furthermore, it makes possible the application of ring resonators on plasmonic integrated …”

“…If the reflector is applied, as shown in Figure 5c, the drop efficiencies will be enhanced, and the corresponding parameters will be: IL = 2.0 dB and CT = 23.2 dB for channel 1; IL = 3.2 dB and CT = 18.0 dB for channel 2. Compared with previous works [7][8][9], this device has comparable performance. Furthermore, it makes possible the application of ring resonators on plasmonic integrated wavelength division multiplex (WDM) systems, which is valuable for designing on-chip integrated circuits.…”

“…Therefore, MIM-based plasmonic devices will play an important role in future PICs. Recently, many kinds of plasmonic devices utilizing the MIM structure have been introduced, such as filter [4][5][6], demultiplexer [7][8][9], switch [10][11][12][13], and sensor devices [14][15][16][17][18][19].…”

Optical bistability based on Bragg grating resonators in metal-insulator-metal plasmonic waveguides

“…[7][8][9] On the one hand, SPP functional devices which utilize surface plasmons in metal-insulator-metal (MIM) waveguides could be easily integrated in more complex plasmonic circuits. MIM structure based splitters, 10 filters, 11 demultiplexers 12 and Bragg reflectors [13][14][15] have been reported recently. On the other hand, optical bistability is a rapidly expanding field of current research because of its potential application in all-optical transistors, switches, memories and logic gates.…”