Preparation And Performance Of Mie Resonance Of Zinc Sulfide Particles Based

The existence of many factors such as the mobility of electron and relaxation time limits the speed and bandwidth of telecommunications.The speed of optical devices is only limited by the speed of light.Therefore,ultra-high-speed and large-capacity all-optical networks are effective solutions to the bottleneck of telecommunications systems.All-optical switch is a key element in all-optical signal processing systems.In this work,two Mie resonant of ZnS based optical switches with AAO template and SiO₂ aerogel as carrier respectively were prepared by sol-gel method and impregnation method,and the switching performance and structure of the sample were analyzed by CST MWS.First,ZnS was prepared by sol-gel method with thiourea and zinc acetate as sulfur and zinc sources,respectively,and dissolving them in a mixed solution of isopropanol and ammonia.Secondly,for the optical switch using the AAO template as the carrier,zinc sulfide was loaded into the AAO template by the template impregnation method and successfully produced the optical switch.The effects of ZnS sol concentration,template dipping times,template size,dipping atmosphere,pretreatment and surface residue were studied by analyzing the material micro-morphology.At vacuum atmosphere,the pretreated AAO template with a size of 1 cm×1 cm was immersed 10times in 0.1 mol/L ZnS sol for 10 min each time,and the surface was treated with 9.5wt%dilute hydrochloric acid for 5 times.Regular arrangement of uniform scale ZnS was prepared-inside the AAO template.The transmission results indicate that Mie resonance occurred in the wavelength range of 200 nm?400 nm.For the optical switch using SiO₂ aerogel as the carrier,orthosilicate,deionized water,and absolute ethanol were used as precursors,and dried under normal pressure to prepare SiO₂ aerogel.After that,the ZnS was loaded into the SiO₂ aerogel using the dipping method and successfully produced the optical switch.The results of material micro-morphology and element content,optical properties indicate,that ZnS particles were obtained in SiO₂ aerogel,and the Mie resonance occurred in the wavelength range of 1250 nm?2000 nm.Finally,in order to determine the switching characteristics of the two types of optical switches,the two types of optical switches were designed and analyzed by CST MWS software,and it was found that the optical switch using the AAO template as the carrier achieved the highest switching ratio in the 150 nm range of ZnS particles.But the sensitivity decreases with the increasing of particles size.The switching ratio with SiO₂ aerogel as the carrier decreases gradually with the increasing of ZnS particle size,reaching a minimum at about 700 nm,and then with the increase of the particle size,the switching ratio will gradually increase.The sensitivity of optical switches using SiO₂ aerogels increases with the increasing of the ZnS particles size.