پديد آورندگان :
ﻧﻮري ﻣﻬﺘﺎج، ﺣﻤﯿﺪه , ﺟﺎرﭼﯽ، ﺳﺎﻏﺮ داﻧﺸﮕﺎه ﺑﯿﻦ اﻟﻤﻠﻠﯽ اﻣﺎم ﺧﻤﯿﻨﯽ (ره) - داﻧﺸﮑﺪه ﻓﻨّﯽ و ﻣﻬﻨﺪﺳﯽ - ﻗﺰوﯾﻦ , ﮐﺸﺖ ﮐﺎر، اﺻﻐﺮ
چكيده فارسي :
در اﯾﻦ ﻣﻘﺎﻟﻪ ﺗﺄﺛﯿﺮ اﺳﺘﻔﺎده از زﯾﺮﻻﯾﻪ ﮔﺮاﻓﻨﯽ ﺑﺮ روي ﺟﺬب ﻧﺎﻧﻮﭘﻮﺳﺘﻪﻫﺎي ﻓﻠﺰي ﮐﺮوي ﻃﻼ (Au) و ﻧﻘﺮه (Ag) ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. در اﯾﻦ ﺑﺮرﺳﯽﻫﺎ ﺑﺮاي ﻫﺮ ﮐﺪام از دو ﭘﻮﺳﺘﻪ ﻓﻠﺰي ﻣﺬﮐﻮر ﺑﻪ ﻃﻮر ﺟﺪاﮔﺎﻧﻪ ﺳﻪ ﻧﻮع ﻫﺴﺘﻪ دياﻟﮑﺘﺮﯾﮏ ﻣﺘﻔﺎوتِ ﻫﻮا (Air)، ﺳﯿﻠﯿﮑﻮن (Si) و آﻟﻮﻣﯿﻨﺎ (Al2 O3) در ﻧﻈﺮ ﮔﺮﻓﺘﻪ ﺷﺪه اﺳﺖ. ﺑﺮرﺳﯽ، ﺷﺒﯿﻪ ﺳﺎزي و ﻣﻘﺎﯾﺴﻪ اﯾﻦ ﻧﺎﻧﻮ ﭘﻮﺳﺘﻪﻫﺎ ﺑﺮاي دو اﻧﺪازه ي ﺷﻌﺎع ﮐﻞ ّ ﺳﺎﺧﺘﺎر ﺑﺮاﺑﺮ ﺑﺎ 25 ﻧﺎﻧﻮﻣﺘﺮ و 50 ﻧﺎﻧﻮﻣﺘﺮ، اﻧﺠﺎم ﮔﺮﻓﺘﻪ اﺳﺖ. ﻫﺪف اﺻﻠﯽ اﯾﻦ ﻣﻘﺎﻟﻪ ﺑﺮرﺳﯽ ﭘﺎراﻣﺘﺮﻫﺎي ﻣﺨﺘﻠﻒ ﺳﺎﺧﺘﺎر ﺟﻬﺖ دﺳﺘﯿﺎﺑﯽ ﺑﻪ ﺑﻬﺒﻮد ﺟﺬب ﻣﯽ ﺑﺎﺷﺪ. ﻧﻤﻮدار ﺑﺮش ﻣﻘﻄﻊ ﻋﺮﺿﯽ (ACS) در ﺗﻤﺎم ﻣﻮارد ﻣﻄﺎﻟﻌﻪ ﺷﺪه اﺳﺖ. در ﻣﻄﺎﻟﻌﺎت اﻧﺠﺎم ﺷﺪه ﺑﺮ روي ﻧﺘﺎﯾﺞ، ﻣﺸﺎﻫﺪه ﻣﯽﺷﻮد ﺣﻀﻮر زﯾﺮﻻﯾﻪ ﮔﺮاﻓﻨﯽ در زﯾﺮ ﻧﺎﻧﻮﭘﻮﺳﺘﻪﻫﺎي ﻓﻠﺰي ﺑﺮ ﻣﯿﺰان داﻣﻨﻪ ﺟﺬب آﻧﻬﺎ ﻣﯽاﻓﺰاﯾﺪ. در اﯾﻦ ﺑﯿﻦ ﻋﻮاﻣﻠﯽ ﻣﺎﻧﻨﺪ اﻧﺪازه ﺿﺨﺎﻣﺖ ﭘﻮﺳﺘﻪي ﻓﻠﺰيِ ﻧﺎﻧﻮﭘﻮﺳﺘﻪ، اﻧﺪازه ﺿﺨﺎﻣﺖ زﯾﺮﻻﯾﻪ ﮔﺮاﻓﻨﯽ، ﺟﻨﺲ دياﻟﮑﺘﺮﯾﮏ ﻣﻮرد اﺳﺘﻔﺎده، اﻧﺪازه ﺷﻌﺎع ﮐﻠﯽّ ﺳﺎﺧﺘﺎر و ﻫﻤﭽﻨﯿﻦ ﺟﻨﺲ ﻣﺤﯿﻂ ﭘﯿﺮاﻣﻮن، ﺑﻪ ﺷﺪّت در ﻣﯿﺰان ﺑﻬﺒﻮد و اﻓﺰاﯾﺶ در داﻣﻨﻪ ﻧﻤﻮدار ﺑﺮش ﻣﻘﻄﻊ ﻋﺮﺿﯽ ﺟﺬب ﺳﺎﺧﺘﺎر، ﻣﺆﺛﺮّ ﻫﺴﺘﻨﺪ و ﺑﺮاي داﺷﺘﻦ ﺑﯿﺸﯿﻨﻪي ﺟﺬب، ﺑﺎﯾﺪ ﻣﺼﺎﻟﺤﻪاي ﺑﯿﻦ اﯾﻦ ﮐﻤﯿّﺖﻫﺎ وﺟﻮد داﺷﺘﻪ ﺑﺎﺷﺪ.
چكيده لاتين :
In this article the effect of using graphene substrate on absorption of spherical metallic gold (Au) and silver (Ag) nano shells has been investigated. In this study, for each one of the two mentioned metallic nano shells, three kind of different dielectrics: air, silicon (si) and alumina (Al2O3), have been considered. Investigation, simulation and comparison of these nano shells have been done in two sizes of structure overall radius equal to 25 nm and 50 nm. The main purpose of this paper is studing on parameters of the structure in order to provide absorption enhancement. Absorption cross section (ACS), for all cases, is investigated and shown plotted. According to performed studies on results, it is observed that utilizing graphene substrate under metallic nano shells increases amplitude of absorption. In this case, some parameters such as, thickness of metallic nano shells, thickness of graphene substrate, material of used dielectric, overall radius of structure and also material of surrounding medium are very effective on improving and increasing amplitude of absorption cross section. So, to have maximum absorption, a trade-off should be existed among mentioned parameters.
