High Figure of Merit Optical Buffering in Coupled-Slot Slab Photonic Crystal Waveguide with Ionic Liquid.

Israa Abood,Sayed Elshahat,Zhengbiao Ouyang

doi:10.3390/nano10091742

Israa Abood, Sayed Elshahat + Show 1 more

Open Access

https://doi.org/10.3390/nano10091742

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Journal: Nanomaterials	Publication Date: Sep 3, 2020
Citations: 8	License type: CC BY 4.0

Affiliation: Shenzhen University, Assiut University

Abstract

Slow light with adequate low group velocity and wide bandwidth with a flat band of the zero-dispersion area were investigated. High buffering capabilities were obtained in a silicon-polymer coupled-slot slab photonic crystal waveguide (SP-CS-SPCW) with infiltrating slots by ionic liquid. A figure of merit (FoM) around 0.663 with the lowest physical bit length of 4.6748 µm for each stored bit in the optical communication waveband was gained by appropriately modifying the square air slot length. Posteriorly, by filling the slots with ionic liquid, the was enhanced to be 4.2817 μm with the highest FoM of 0.72402 in wider transmission bandwidth and ultra-high bit rate in terabit range, which may become useful for the future 6G mobile communication network. Ionic liquids have had a noticeable effect in altering the optical properties of photonic crystals. A polymer was used for the future incorporation of an electro-optic effect in buffers to realize the dynamic controlling of optical properties. Ionic liquids enhanced the transmission rate through optical materials. Additionally, the delay time in the ns-range was achieved, providing longer delay and ultra-low group velocity, which is important for light-matter interaction in light amplifiers and nonlinear devices.

Highlights

Incoming polymer technology has provided attractive candidates for photonic materials due to their low-cost production and wide bandwidth [1,2,3]
We considered polymerized Room temperature ionic liquids (RTILs) in our calculations based on silicon-polymer, coupled-slot, slab photonic crystal waveguide (SP-CS-SPCW), which exploits the benefits of both coupled-slot cavity and RTILs infiltrated
It is interesting to note that the GVD changes with negative and positive values in the operating frequency range, which is suitable for dispersion compensation applications

Summary

Introduction

Incoming polymer technology has provided attractive candidates for photonic materials due to their low-cost production and wide bandwidth [1,2,3]. RTILs possess strong electrostatic field, good electrical and thermal conductivity, good light transmittance and high refractive index [6,7], good chemical stability and thermal stability, and are recyclable and environmentally friendly. Several RTILs with relatively low indices (n f < 1.50) and high-index RTILs ((n f > 1.70) are commercially available [5] These ILs are used as immersion liquids to tune the optical properties of photonic crystals (PhCs) or to match the refractive indices of the constituting materials of these photonic crystals. The RTIL-based planar optical components can be realized on glass substrates because of the relatively high refractive indices of RTIL-derived polymers (about 1.65) [5]. We considered polymerized RTILs in our calculations based on silicon-polymer, coupled-slot, slab photonic crystal waveguide (SP-CS-SPCW), which exploits the benefits of both coupled-slot cavity and RTILs infiltrated

Theoretical Characteristics

Structure Geometry and Simulation Results

Dispersion

Losses

Conclusions