Graphene-based dynamically tunable absorbers through guided mode resonance

Cao, Shuhua; Zhang, Dawei; Wang, Qi

doi:10.1016/j.spmi.2020.106550

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Due to these facts, the aligned MGDG structure has the weaker electric field intensity and smaller GH shift at the wavelength of m 37.5 m than those in the misaligned MGDG structure. These findings demonstrate that the MGDG structure is able to excite the GMR with the strongest electric field intensities, which effectively increases the interaction between the incident wave and the MGDG structure and its absorption [45][46][47]. Thus, the MGDG structure has the greatly decreased reflectance and the sharp reflection phase change at the wavelength of m 37.5 , m which contributes to its largest GH shift.…”

Section: = =mentioning

confidence: 78%

Dual dielectric grating-assisted enhancement of Goos-Hänchen shift in monolayer graphene

Shanshan¹,

Zhu²,

Lu³

et al. 2022

Phys. Scr.

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Recently, the dielectric gratings have been used in enhancing the Goos-Hänchen (GH) shifts of monolayer graphene. However, many of these structures are limited within single dielectric grating. Dual dielectric gratings are compelling candidates for the manipulation of the light-matter interaction owing to their flexible degree of freedom in geometrical parameters. Here, we present the GH shift of the reflected wave in the dual dielectric grating layers by using rigorous coupled-wave analysis (RCWA) and stationary phase method, where a monolayer graphene is placed on top of the lower dielectric grating layer and the upper and lower dielectric grating layers have different filling factors. It is found that a relatively large GH shift, with amplitude up to more than 8000 times of the incident wavelength, can be achieved in the dual dielectric grating layers with monolayer graphene due to the joint excitation of the guided mode resonance (GMR) in both the upper and lower dielectric grating layers. In addition, we can control the magnitude and position of GH shifts by changing chemical potential of monolayer graphene and the geometrical parameters of the dual dielectric grating layers. Our work opens a possibility for the improvement of the GH shift in the combined structure with the dual dielectric grating layers and the two-dimensional layered structure, which might enable the novel optoelectronic devices.

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Section: = =mentioning

confidence: 78%

Dual dielectric grating-assisted enhancement of Goos-Hänchen shift in monolayer graphene

Shanshan¹,

Zhu²,

Lu³

et al. 2022

Phys. Scr.

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“…By properly selecting the slit width as s = 74 nm with other structural parameters kept the same, near-perfect absorption of the monolayer graphene (97.8%) can be obtained at the wavelength of λ r = 1.55 µm with the full width at half maximum (FWHM) of ∆λ = 4.0 nm, as indicated by the theoretical RCWA result in Figure 5b. Compared with the previous graphene absorbers whose absorption efficiency is not high in the two-port system composed of graphene [8][9][10], and those metal mirror [17][18][19][20][21] or multilayer Bragg mirror [24][25][26][27][28][29] structuresthat are required to realize high absorption of graphene at critical coupling, the proposed absorber exhibits the advantage of achieving high absorption efficiency of graphene within a comparatively simple two-port system. Figure 5a shows absorption response of the Si-based PCS with graphene as a function of the slit width s. As can be seen in Figure 5a, the absorption of graphene associated with the quasi-BIC modes can be flexibly controlled by merely varying the slit width, and the locations of the two absorption channels of graphene are blue-shifted as s is increased due to the decrease in the effective refractive index of the structure.…”

Section: Basic Principles and Cmt For Absorption Enhancement Of Graphenementioning

confidence: 99%

“…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 ]. However, due to the inherent ohmic loss of metal materials, the use of the metallic mirror or structured substrate will inevitably result in suppression of light absorption in graphene.…”

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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“…GMR is more likely to occur in subwavelength grating structures [6][7][8], where the grating period is significantly smaller than the incident light wavelength. Such structures exhibit high diffraction efficiency and narrow bandwidth properties, making them suitable for designing narrow-band filters [9][10][11][12][13], optical modulators [14][15][16][17][18], and sensors [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Polarization Insensitivity Research of the Three-layer Silicon-based Symmetric Cascade Optical Sensor

Wei,

Huang,

et al. 2024

Preprint

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This paper presents a symmetric all-dielectric two-dimensional grating with high transmittance and high figure of merit (FOM) based on cylindrical nanoarrays as a liquid sensing structure with small volume and high sensitivity. The device is optimized using the finite element method to calculate the transmissivity under TE/TM polarization. When the incident angle is 4 degrees, the transmissivity of the grating is nearly 1 with a full width at half maximum of 0.0158 nm and a sensitivity of 256.196 nm/RIU. The FOM is 16214.937. The sensor characteristics of the incident angle on the device are analyzed, and the normalized electric field distribution indicates that the change of the incident angle has a significant modulation ability for the resonance energy distribution. The proposed sensor is independent of polarization state, easy to control and integrate, and has broad application prospects in fields such as liquid solution detection, ocean surveys, and position sensing.

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Graphene-based dynamically tunable absorbers through guided mode resonance

Cited by 7 publications

References 24 publications

Dual dielectric grating-assisted enhancement of Goos-Hänchen shift in monolayer graphene

Dual dielectric grating-assisted enhancement of Goos-Hänchen shift in monolayer graphene

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

Polarization Insensitivity Research of the Three-layer Silicon-based Symmetric Cascade Optical Sensor

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