Ultrathin ultra-broadband electro-absorption modulator based on few-layer graphene based anisotropic metamaterial

详细信息    查看全文

• 作者：Ayed Al Sayem^a ; ^{ayedalsayem143@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; M.R.C. Mahdy^b ; Ifat Jahangir^c ; ^{ifat00@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Md.Saifur Rahman^a
• 关键词：Electro-optic modulator ; Few layer graphene-dielectric metamaterial ; Ultra-broadband ; High modulation depth ; Ultra-low insertion loss ; Polarization independence
• 刊名：Optics Communications
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：384
• 期：Complete
• 页码：50-58
• 全文大小：1874 K

文摘

In this article, a few-layered graphene-dielectric multilayer (metamaterial) electro-optic modulator has been proposed in the mid and far infrared range that works on electro-absorption mechanism. Graphene, both mono layer and few layer, is an actively tunable optical material that allows control of inter-band and intra-band transition by tuning its chemical potential. Utilizing this unique feature of graphene, we propose a multilayer graphene dielectric stack where few layer graphene is preferred over mono layer graphene. Although the total thickness of the stack still remains in the nanometer range, this device can exhibit superior performances in terms of (i) high modulation depth, (ii) ultra-broadband performance, (iii) ultra-low insertion loss due to inherent metamaterial properties, (iv)nano-scale footprint, (v) polarization independence and (vi) capability of being integrated to a silicon waveguide. Interestingly, these superior performances, achievable by using few layer graphene with carefully designed metamaterial, may not be possible with mono layer graphene. Our proposals have been validated by both the effective medium theory and general transfer matrix method.