Binary optimization of gold nano-rods for designing an optical modulator

Emami, Farzin; Akhlaghi, Mehdi; Nozhat, Najmeh

doi:10.1007/s10825-015-0689-x

Cited by 6 publications

(1 citation statement)

References 45 publications

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“…As a result, they are suitable candidates for the realization of highly integrated optical circuits. Various structures have been proposed based on SPPs such as plasmonic filters 7 , 8 , sensors 9 – 12 , directional couplers 13 , 14 , splitters 15 , demultiplexers (DEMUXes) 16 , 17 , logic gates 18 – 20 , modulators 21 , 22 , switches 23 – 26 and so on. One of the most important devices in optical communication is DEMUX structures.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable and scalable 2,4-and 6-channel plasmonics demultiplexer utilizing symmetrical rectangular resonators containing silver nano-rod defects with FDTD method

Khani

Farmani

Mir

2021

Sci Rep

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Reconfigurable and scalable plasmonics demultiplexers have attracted increasing attention due to its potential applications in the nanophotonics. Therefore, here, a novel method to design compact plasmonic wavelength demultiplexers (DEMUXes) is proposed. The designed structures (two, four, and six-channel DEMUXes) consist of symmetrical rectangular resonators (RRs) incorporating metal nano-rod defects (NRDs). In the designed structures, the RRs are laterally coupled to metal–insulator-metal (MIM) waveguides. The wavelengths of the output channels depend on the numbers and radii of the metal NRDs in the RRs. The results obtained from various device geometries, with either a single or multiple output ports, are performed utilizing a single structure, showing real reconfigurability. The finite-difference time-domain (FDTD) method is used for the numerical investigation of the proposed structures. The metal and insulator used for the realization of the proposed DEMUXes are silver and air, respectively. The silver’s permittivity is characterized by the well-known Drude model. The basic plasmonic filter which is used to design plasmonic DEMUXes is a single-mode filter. A single-mode filter is easier to cope with in circuits with higher complexity such as DEMUXes. Also, different structural parameters of the basic filter are swept and their effects on the filter’s frequency response are presented, to provide a better physical insight. Taking into account the compact sizes of the proposed DEMUXes (considering the six-channel DEMUX), they can be used in integrated optical circuits for optical communication purposes.

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