Graphene-based perfect optical absorbers harnessing guided mode resonances

Grande, M.; Vincenti, Maria Antonietta; Stomeo, T.; Bianco, Giuseppe Valerio; Ceglia, Domenico de; Aközbek, Neşet; Petruzzelli, V.; Bruno, Giovanni; Vittorio, Massimo De; Scalora, Michael; D’Orazio, A.

doi:10.1364/oe.23.021032

Cited by 96 publications

(51 citation statements)

References 25 publications

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“…When this type of guided mode of 1DPCs is excited by the grating, it is dually modulated by the periodic distribution of refractive index in the 1DPCs and the periodicity of the dielectric grating. Critical coupling of this dually modulated guided-mode resonance to graphene produces perfect absorption with a ultranarrow bandwidth of 0.03 nm, a value about two orders of magnitude lower than that of the GPAs presented in previous research252627. Correspondingly, the Q-factor of the absorption peak reaches a much higher value of 20000.…”

mentioning

confidence: 66%

“…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%

“…More recently, hole-array photonic crystal slab and slit-array dielectric grating are employed to enhance graphene absorption252627. The hole-array/slit-array can diffract the incident light into evanescent electromagnetic waves and then excite the guided-mode resonance within the photonic crystal slab/dielectric grating.…”

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confidence: 99%

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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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confidence: 66%

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confidence: 99%

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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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“…In particular, in the optical and THz regimes, graphene has been employed for the realization of optical absorbers exploiting Attenuated Total Reflectance (ATR) [2] or resonant configurations such as onedimensional (1D) periodic structures [3][4], two-dimensional photonic crystal cavities [5] and guided mode resonances [6][7]. On the other hand, in the microwave regime, few examples of graphene-based absorbers have been reported to date [8][9].…”

Section: Introductionmentioning

confidence: 99%

Optically transparent graphene-based Salisbury screen microwave absorber

Grande

D’Orazio

Bianco

et al. 2015

2015 IEEE 15th Mediterranean Microwave Symposium (MMS)

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We propose an analytical model to study the absorption of a graphene sheet in the microwave range when its sheet resistance is varied. We demonstrate that the maximum achievable for a suspended structure is 50% and it is independent of the frequency in the range of interest. Finally, we propose a microwave absorber based on a Salisbury screen configuration consisting of two opportunely doped graphene sheets separated by a quarter-wavelength dielectric lossless spacer. In particular, we show how it is possible to achieve nearperfect absorption over a wide frequency bandwidth and how this graphene-based absorber is less sensitive to the variation of the graphene sheet resistance. The realization of the microwave absorber with few-layer graphene leads to a fully transparent device in the visible-near infrared range.

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“…[26][27][28][29] And complete absorptions of monolayer graphene were numerically demonstrated by using critical coupling and guided mode resonance. [30][31][32] In the experiment, total absorptions about 40% [32] and 85% [33] and graphene absorption about 77% [25] in the visible and near-infrared were measured from monolayer graphene coupled with 1D dielectric grating or 2D silicon photonic crystals on top of a back mirror. However, higher absorption is highly desirable for high-performance graphene-based optoelectronic devices, and the experimentally realization of complete absorption for monolayer graphene based structures in the optical range is still a great challenge.…”

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confidence: 99%

Experimental Demonstration of Total Absorption over 99% in the Near Infrared for Monolayer‐Graphene‐Based Subwavelength Structures

Guo

Zhu

Yuan

et al. 2016

Advanced Optical Materials

113

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CommuniCationoptical absorption in experiment for monolayer graphene based subwavelength structures in the near-infrared. Peak absorptions over 99% at wavelength around 1.5 μm with full-width at half maximum (FWHM) about 20 nm are demonstrated from mono layer graphene coupled with different subwavelength gratings on top of a back gold mirror. The experimental results are in excellent quantitative agreement with the simulation results obtained by using finite-element method, which confirm convincingly the theoretical prediction of complete optical absorption for monolayer graphene in the near-infrared range.The schematic image of the absorption structure under investigation in this work is demonstrated in Figure 1a. The structure comprises a monolayer graphene which is sandwiched between a 1D polymethy1-methacrylate (PMMA) grating and a silica layer, and a gold layer is coated in the back side of the silica layer. The absorption structure shown in Figure 1a supports several resonant modes which could be excited by outside incident waves under phase matching conditions. When the incident wave is coupled with a resonant mode, the absorption of the structure could be enhanced due to the field enhancement in the structure. And complete absorption can be obtained when the reflection wave is canceled by the emission wave of the resonant mode since the transmission of the structure is blocked by the gold layer.The monolayer graphene based absorption structures shown in Figure 1a were fabricated on a silicon substrate, and an optical image of our fabricated sample is shown in Figure 1b. The fabrication processes are listed as follows. A 4 nm chromium (Cr) layer was first deposited on a 2 cm size silicon substrate by using electron-beam evaporation, and a 200 nm gold layer was deposited on the Cr layer by using magnetron sputtering. Then, a 520 nm silica layer was deposited by plasmaenhanced chemical vapor deposition on the gold layer. And next, a 1 cm size monolayer graphene (ACS MATERIAL) was transferred on the top of the silica layer. Finally, a PMMA layer was spin coated on the substrate and grating patterns with different periods were formed in the PMMA layer by using E-beam lithography. From Figure 1b we can see that the grating patterns with different periods have different diffraction colors, and the area of the sample with graphene has a slight difference in color from that of the area without graphene. The topview scanning electron microscope (SEM) image of a fabricated pattern is shown in Figure 1c, and the white bar in the figure represents 5 μm. We measured the Raman spectrum of the monolayer graphene after the device fabrication, and compared it with the Raman spectrum of the monolayer graphene before being transferred to our sample (provided by the ACS The copyright line of this paper was changed 13 October 2016 after initial publication.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, pr...

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Graphene-based perfect optical absorbers harnessing guided mode resonances

Cited by 96 publications

References 25 publications

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

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

Optically transparent graphene-based Salisbury screen microwave absorber

Experimental Demonstration of Total Absorption over 99% in the Near Infrared for Monolayer‐Graphene‐Based Subwavelength Structures

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