Experimentally feasible green-light negative index metamaterial

Rahman, Mahfuzur; Aslam, Muhammad Imran; Güney, Durdu Ö.; Evans, Philip G.

doi:10.1109/metamaterials.2013.6809020

2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics 2013

DOI: 10.1109/metamaterials.2013.6809020

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Experimentally feasible green-light negative index metamaterial

Mahfuzur Rahman

Muhammad Imran Aslam

Durdu Ö. Güney

et al.

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2015

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“…1 can be fabricated by self-aligned electronbeam lithography exposures and dielectric layer deposition via atomic layer deposition by choosing, for example, Ag as the metal and Al2O3 as the dielectric. Considering the experimental data [66] and misalignments, we have previously verified [67] that the negative index persists. We have confirmed through a series of sensitivity analyses that the structure is also tolerant to other imperfections possible at different stages of the fabrication process including the variations in dielectric thickness (i.e., change from 8nm to 15nm), dielectric surface roughness (i.e., within ± 10% of the average thickness), and strip width (i.e., ± 2.5% change).…”

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Plasmon Injection to Compensate and Control Losses in Negative Index Metamaterials

et al. 2015

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Metamaterials have introduced a whole new world of unusual materials with functionalities that cannot be attained in naturally occurring material systems by mimicking and controlling the natural phenomena at subwavelength scales. However, the inherent absorption losses pose fundamental challenge to the most fascinating applications of metamaterials. Based on a novel plasmon injection (PI or )-scheme, we propose a coherent optical amplification technique to compensate losses in metamaterials. Although the proof of concept device here operates under normal incidence only, our proposed scheme can be generalized to arbitrary form of incident waves. The -scheme is fundamentally different than major optical amplification schemes. It does not require gain medium, interaction with phonons, or any nonlinear medium. The -scheme allows for loss-free metamaterials. It is ideally suited for mitigating losses in metamaterials operating in the visible spectrum and is scalable to other optical frequencies. These findings open the possibility of reviving the early dreams of making "magical" metamaterials from scratch. PACS numbers:Metamaterials have led to previously unthought-of applications such as flat lens [1], perfect lens [2], hyperlens [3][4][5], ultimate illusion optics [6][7][8], perfect absorber [9,10], optical analog simulators [11,12], metaspacers [13], and many others. Despite tremendous progress in theory and experimental realizations, the major current challenges seem to further delay the metamaterial era to come. For instance, achieving full isotropy, feasible fabrication methods, broad bandwidth, and compensation of dissipative losses especially at optical frequencies are among the challenges yet to be solved [14,15]. Perhaps, the most critical of all is how to avoid optical losses -especially in large-volume structures. The performance of devices utilizing metamaterials dramatically degrades at optical frequencies due to significant ohmic losses arising from the metallic constituents. The strategies proposed to mitigate the losses include passive reduction and active compensation schemes. Avoiding sharp edges [16], reducing skin depths [16][17][18], and classical analog of electromagnetically induced transparency are proposed as passive loss minimization techniques [19,20]. Constitutive materials such as dielectrics [21], nitrides [22], oxides [23], graphene [24], and superconductors [24-30] have also been explored for possible alternatives to lossy conductors. However, none of these materials have so far shown to outperform the performance of high-conductivity metals at room temperature [31,32]. Active compensation of losses using gain medium has been emerged as the most promising strategy to avoid the deleterious impacts of losses on metamaterial devices. Optically pumped semiconductor quantum dots and quantum wells incorporated in planar metamaterials have been experimentally shown to compensate the losses to some extent [33][34][35][36][37][38]. A remarkable improvement in the figure of merit (FOM) of a ...

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Plasmon Injection to Compensate and Control Losses in Negative Index Metamaterials

et al. 2015

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Experimentally feasible green-light negative index metamaterial

Cited by 1 publication

References 10 publications

Plasmon Injection to Compensate and Control Losses in Negative Index Metamaterials

Plasmon Injection to Compensate and Control Losses in Negative Index Metamaterials

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