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A graphene-assisted all-pass filter for a tunable terahertz transmissive modulator with near-perfect absorption

We proposed an all-pass filter based perfect absorber scheme which also can function as a highly efficient transmissive modulator. We theoretically analyzed the proposed scheme using the temporal coupled mode theory and showed that near-perfect absorption could be achieved with practically modest deviation from the critical coupling condition. We also demonstrated the feasibility...

Resonator-free optical bistability based on epsilon-near-zero mode

A majority of existing research on optical bistability rely on resonant schemes using nonlinear materials, which inevitably require a trade-off between the switching intensity and response time. In this work, we propose a novel non-resonant scheme, which utilizes strong light enhancement of the epsilon-near-zero (ENZ) mode to realize optical bistability. We used graphene as a non...

High fabrication-tolerant narrowband perfect graphene absorber based on guided-mode resonance in distributed Bragg reflector

We propose the narrowband perfect absorbers with enormously high fabrication tolerance, which consists of a low-contrast grating and a finite distributed Bragg reflector (DBR) layer with an ultrathin absorbing medium (graphene). It is numerically shown that the proposed perfect absorber outperforms the previously proposed schemes in fabrication tolerance. According to the...

A proposal of a perfect graphene absorber with enhanced design and fabrication tolerance

We propose a novel device structure for the perfect absorption of a one-sided lightwavve illumination, which consists of a high-contrast grating (HCG) and an evanescently coupled slab with an absorbing medium (graphene). The operation principle and design process of the proposed structure are analyzed using the coupled mode theory (CMT), which is confirmed by the rigorous coupled...

Tunable Wide-Angle Tunneling in Graphene-Assisted Frustrated Total Internal Reflection

• PubMed • Google ScholarSearch for Sangjun Lee in:Nature Research journals • PubMed • Google ScholarSearch for Hyungjun Heo in:Nature Research journals • PubMed • Google ScholarSearch for Sangin Kim ... interests. Corresponding author Correspondence to Sangin Kim. Supplementary information PDF files1.Supplementary Information Rights and permissions This work is licensed under a Creative Commons