Broadband absorption enhancement of monolayer graphene by prism coupling in the visible range

Heo, Hyungjun; Lee, Sang-Jun; Kim, Sangin

doi:10.1016/j.carbon.2019.07.089

Cited by 20 publications

(15 citation statements)

References 31 publications

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“…38 When other dielectric materials are used (e.g., Fig. 6), the multiple dielectric layers can be fabricated through plasma-enhanced chemical vapor deposition (PECVD) 3,39 or spin-coating. 32 Note that imperfections, such as twisted or folded regions, are inevitable during fabrication, which will reduce the performance of the spectrum response obtained in numerical simulation.…”

Section: Resultsmentioning

confidence: 99%

Tunable absorption characteristics in multilayered structures with graphene for biosensing

Jin

Zhou

Lai

2020

J. Innov. Opt. Health Sci.

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Graphene derivatives, possessing strong Raman scattering and near-infrared absorption intrinsically, have boosted many exciting biosensing applications. The tunability of the absorption characteristics, however, remains largely unexplored to date. Here, we proposed a multilayer configuration constructed by a graphene monolayer sandwiched between a buffer layer and one-dimensional photonic crystal (1DPC) to achieve tunable graphene absorption under total internal reflection (TIR). It is interesting that the unique optical properties of the buffer-graphene-1DPC multilayer structure, the electromagnetically induced transparency (EIT)-like and Fano-like absorptions, can be achieved with pre-determined resonance wavelengths, and furtherly be tuned by adjusting either the structure parameters or the incident angle of light. Theoretical analyses demonstrate that such EIT- and Fano-like absorptions are due to the interference of light in the multilayer structure and the complete transmission produced by the evanescent wave resonance in the configuration. The enhanced absorptions and the huge electrical field enhancement effect exhibit potentials for broad applications, such as photoacoustic imaging and Raman imaging.

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Section: Resultsmentioning

confidence: 99%

Tunable absorption characteristics in multilayered structures with graphene for biosensing

Jin

Zhou

Lai

2020

J. Innov. Opt. Health Sci.

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show abstract

“…However, since the wave vector of a graphene SPP wave is considerably larger than that of an incident light beam, exciting an SPP wave in graphene by matching these two wave vectors is significantly challenging. Several methods, such as tailoring graphene into various geometric-patterned nanostructures [ 16 , 17 , 18 ], near-field probe coupling [ 19 , 20 ], prism coupling [ 21 , 22 , 23 ], dielectric grating coupling [ 24 , 25 , 26 ], metal grating coupling [ 27 ], and graphene grating coupling [ 24 , 28 , 29 , 30 , 31 ], have been proposed to overcome this mismatch to explore the advantages of graphene further. Among them, graphene grating, consisting of a graphene-based SPP waveguide array placed on a substrate, effectively compensates for this mismatch using the wave vector of the incident light by diffraction.…”

Section: Introductionmentioning

confidence: 99%

Excitation of Surface Plasmon Polariton Modes with Double-Layer Gratings of Graphene

et al. 2022

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A long-range surface plasmon polariton (SPP) waveguide, composed of double-layer graphene, can be pivotal in transferring and handling mid-infrared electromagnetic waves. However, one of the key challenges for this type of waveguide is how to excite the SPP modes through an incident light beam. In this study, our proposed design of a novel grating, consisting of a graphene-based cylindrical long-range SPP waveguide array, successfully addresses this issue using finite-difference time-domain simulations. The results show that two types of symmetric coupling modes (SCMs) are excited through a normal incident light. The transmission characteristics of the two SCMs can be manipulated by changing the interaction of the double-layer gratings of graphene as well as by varying various parameters of the device. Similarly, four SCMs can be excited and controlled by an oblique incident light because this light source is equivalent to two orthogonal beams of light. Furthermore, this grating can be utilized in the fabrication of mid-infrared optical devices, such as filters and refractive index sensors. This grating, with double-layer graphene arrays, has the potential to excite and manipulate the mid-infrared electromagnetic waves in future photonic integrated circuits.

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“…To enhance the light absorption of graphene in Vis–NIR region, several mechanisms such as guided-mode resonance [ 7 , 8 , 9 ], coherent absorption [ 10 ], cavity resonance [ 11 , 12 ], plasmonic resonance [ 13 , 14 ], and prism coupling [ 15 , 16 ] have been proposed to enhance the light–graphene interaction. Unfortunately, the peak values of light absorption in monolayer graphene are confined in the range of 30–60% in most cases [ 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. To significantly improve the light absorption of graphene, an effective approach is to integrate the graphene with the metasurfaces supported by the metallic mirror [ 17 , 18 , 19 , 20 , 21 ] or metallic structured substrate [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Light Absorption of Monolayer Graphene by Quasi-Bound State in the Continuum

et al. 2021

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Graphene is an ideal ultrathin material for various optoelectronic devices, but poor light–graphene interaction limits its further applications particularly in the visible (Vis) to near-infrared (NIR) region. Despite tremendous efforts to improve light absorption in graphene, achieving highly efficient light absorption of monolayer graphene within a comparatively simple architecture is still urgently needed. Here, we demonstrate the interesting attribute of bound state in the continuum (BIC) for highly efficient light absorption of graphene by using a simple Si-based photonic crystal slab (PCS) with a slit. Near-perfect absorption of monolayer graphene can be realized due to high confinement of light and near-field enhancement in the Si-based PCS, where BIC turns into quasi-BIC due to the symmetry-breaking of the structure. Theoretical analysis based on the coupled mode theory (CMT) is proposed to evaluate the absorption performances of monolayer graphene integrated with the symmetry-broken PCS, which indicates that high absorption of graphene is feasible at critical coupling based on the destructive interference of transmission light. Moreover, the absorption spectra of the monolayer graphene are stable to the variations of the structural parameters, and the angular tolerances of classical incidence can be effectively improved via full conical incidence. By using the full conical incidence, the angular bandwidths for the peak absorptivity and for the central wavelength of graphene absorption can be enhanced more than five times and 2.92 times, respectively. When the Si-based PCS with graphene is used in refractive index sensors, excellent sensing performances with sensitivity of 604 nm/RIU and figure of merit (FoM) of 151 can be achieved.

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Broadband absorption enhancement of monolayer graphene by prism coupling in the visible range

Cited by 20 publications

References 31 publications

Tunable absorption characteristics in multilayered structures with graphene for biosensing

Tunable absorption characteristics in multilayered structures with graphene for biosensing

Excitation of Surface Plasmon Polariton Modes with Double-Layer Gratings of Graphene

Highly Efficient Light Absorption of Monolayer Graphene by Quasi-Bound State in the Continuum

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