Greatly enhanced ultrabroadband light absorption by monolayer graphene

Zhao, Wangshi; Shi, Kaifeng; Lu, Zhaolin

doi:10.1364/ol.38.004342

Cited by 46 publications

(22 citation statements)

References 41 publications

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“…The proposed structure may have potential application in fabrication of various optical devices especially optical modulators. We also notice that there were works using ATR to enhance graphene absorption, 23,26,27 however extra resonant structures were not included there, total absorption were not achieved.…”

Section: Introductionmentioning

confidence: 99%

Absorption enhancement and total absorption in a graphene-waveguide hybrid structure

Guo

Dai

et al. 2017

AIP Advances

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We propose a graphene/planar waveguide hybrid structure, and demonstrate total absorption in the visible wavelength range by means of attenuated total reflectance. The excitation of planar waveguide mode, which has strong near field enhancement and increased light interaction length with graphene, plays a vital role in total absorption. We analyze the origin and physical insight of total absorption theoretically by using an approximated reflectance, and show how to design such hybrid structure numerically. Utilizing the tunability of doped graphene, we discuss the possible application in optical modulators. We also achieve broadband absorption enhancement in near-IR range by cascading multiple graphene-waveguide hybrid structures. We believe our results will be useful not only for potential applications in optical devices, but also for studying other two-dimension materials.

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Section: Introductionmentioning

confidence: 99%

Absorption enhancement and total absorption in a graphene-waveguide hybrid structure

Guo

Dai

et al. 2017

AIP Advances

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“…Another way is to utilize the plasmonic oscillations associated with optical nanoantennas that can create a localized strong electric field [28][29][30][31][32][33]. While the attenuated total reflection configuration setup can also be employed to enhance absorption near the critical angle [34], the enhancement is generally not very significant. It should be noted that guided resonances in dielectric gratings [35,36] can create an enhanced electric field to boost graphene absorption through critical coupling using photonic crystals [37], and may achieve total absorption.…”

Section: Introductionmentioning

confidence: 99%

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Zhao

Zhang

2015

J. Opt. Soc. Am. B

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It has been demonstrated recently that metal gratings can significantly improve the near-infrared absorptance of graphene from 0.023 to nearly 0.70 because of the excitation of magnetic polaritons (MPs). In the present study, it is shown that the absorptance of graphene can be further enhanced to more than 0.80 by surface plasmon polaritons (SPPs) enabled by the grating. Meanwhile, graphene behaves as a sheet resistor that is able to boost the absorption when MPs or SPPs are excited without changing their resonance frequencies or dispersion relations. The effects of higher-order MPs, as well as the grating geometry on the enhanced absorptance, are also examined. Rigorous coupled-wave analysis (RCWA) is employed to calculate the radiative properties and power dissipation density in both the graphene and the metal grating. This study will facilitate the understanding of the coupling phenomena between graphene and nanostructures and may also benefit the design of next-generation graphenebased optical and optoelectronic devices.

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“…However, in the visible and near-infrared range, graphene only absorbs about 2.3% of the light at normal incidence, which is a severe limitation to its further application in optoelectronic devices. Tremendous research efforts have been made to improve light absorption in graphene and various methods have been presented to enhance the light-graphene interaction by improving the optical electric field around the graphene111213141516171819202122232425262728. For example, Fabry-Perot microcavity is constructed by integrating graphene between two mirrors1617.…”

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confidence: 99%

Achieving ultranarrow graphene perfect absorbers by exciting guided-mode resonance of one-dimensional photonic crystals

Long

Shen

et al. 2016

Sci Rep

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Graphene perfect absorbers with ultranarrow bandwidth are numerically proposed by employing a subwavelength dielectric grating to excite the guided-mode resonance of one-dimensional photonic crystals (1DPCs). Critical coupling of the guided-mode resonance of 1DPCs to graphene can produce perfect absorption with a ultranarrow bandwidth of 0.03 nm. The quality factor of the absorption peak reaches a ultrahigh value of 20000. It is also found that the resonant absorption peaks can be tuned by controlling the dispersion line of the guided mode and the period of the grating. When the parameters of the grating and the 1DPCs are suitably set, the perfect absorption peaks can be tuned to any randomly chosen wavelength in the visible wavelength range.

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Greatly enhanced ultrabroadband light absorption by monolayer graphene

Cited by 46 publications

References 41 publications

Absorption enhancement and total absorption in a graphene-waveguide hybrid structure

Absorption enhancement and total absorption in a graphene-waveguide hybrid structure

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Achieving ultranarrow graphene perfect absorbers by exciting guided-mode resonance of one-dimensional photonic crystals

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