Dually guided-mode-resonant graphene perfect absorbers with narrow bandwidth for sensors

Long, Yun-Ze; Li, Yuanxing; Shen, Liang; Liang, Wenyue; Deng, Haixiao; Xu, Haitao

doi:10.1088/0022-3727/49/32/32lt01

Cited by 38 publications

(29 citation statements)

References 26 publications

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“…To overcome this problem, various physical mechanisms [ 18 – 43 ] to enhance absorption of graphene in the visible region have been proposed, which include strong photon localization on the defect layer in one-dimensional (1D) photonic crystals [ 18 , 28 , 33 , 38 ], total internal reflection [ 19 , 20 , 23 , 27 ], surface plasmon resonances [ 21 , 22 , 30 , 31 , 33 ], evanescent diffraction orders of the arrays of metal nanoparticles [ 34 ], and critical coupling to guided mode resonances [ 25 , 26 , 32 , 34 , 35 , 37 , 39 – 41 ]. Besides the absorption enhancement in graphene, achieving multiband and broadband light absorption in graphene is also important for some graphene-based optoelectronic devices from a practical point of view.…”

Section: Introductionmentioning

confidence: 99%

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

et al. 2018

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It is well known that a suspended monolayer graphene has a weak light absorption efficiency of about 2.3% at normal incidence, which is disadvantageous to some applications in optoelectronic devices. In this work, we will numerically study multiband and broadband absorption enhancement of monolayer graphene over the whole visible spectrum, due to multiple magnetic dipole resonances in metamaterials. The unit cell of the metamaterials is composed of a graphene monolayer sandwiched between four Ag nanodisks with different diameters and a SiO2 spacer on an Ag substrate. The near-field plasmon hybridizations between individual Ag nanodisks and the Ag substrate form four independent magnetic dipole modes, which result into multiband absorption enhancement of monolayer graphene at optical frequencies. When the resonance wavelengths of the magnetic dipole modes are tuned to approach one another by changing the diameters of the Ag nanodisks, a broadband absorption enhancement can be achieved. The position of the absorption band in monolayer graphene can be also controlled by varying the thickness of the SiO2 spacer or the distance between the Ag nanodisks. Our designed graphene light absorber may find some potential applications in optoelectronic devices, such as photodetectors.

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Section: Introductionmentioning

confidence: 99%

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

et al. 2018

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“… where β is the propagation wavenumber along the guiding direction, k 0 is the free-space wavenumber, n eff is the effective refractive index of the mode inside the core, m is the diffraction order, λ 0 is the free-space wavelength and Λ is the grating period. Writing an analytical expression for the phase-matching condition in Device I is cumbersome because our grating diffracts incoming waves in not only the x-direction but also in the y-direction, as opposed to the explicitly used devices with 1D grating 44 – 51 does. Therefore, the guided-mode’s propagation direction is not simply the x-direction as in Device 0.…”

Section: Resultsmentioning

confidence: 99%

“…The difference between two methods is the structures where GMRs are excited. The third method is to couple graphene to the GMRs of photonic crystal slabs (PhCs) 43 or 1-dimensional photonic crystals (1DPCs), excited by sub-wavelength grating (SWG) couplers 44 , 45 . The guided-mode leaks out evanescent waves to graphene.…”

Section: Introductionmentioning

confidence: 99%

Near-absolute polarization insensitivity in graphene based ultra-narrowband perfect visible light absorber

Yıldırım

Ghobadi

Özbay

2018

Sci Rep

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Strong light-graphene interaction is essential for the integration of graphene to nanophotonic and optoelectronic devices. The plasmonic response of graphene in terahertz and mid-infrared regions enhances this interaction, and other resonance mechanisms can be adopted in near-infrared and visible ranges to achieve perfect light absorption. However, obtaining near-absolute polarization insensitivity with ultra-narrow absorption bandwidth in the visible and near-infrared regimes remains a challenge. In this regard, we numerically propose a graphene perfect absorber, utilizing the excitation of guided-modes of a dielectric slab waveguide by a novel sub-wavelength dielectric grating structure. When the guided-mode resonance is critically coupled to the graphene, we obtain perfect absorption with an ultra-narrow bandwidth (full-width at half-maximum) of 0.8 nm. The proposed design not only preserves the spectral position of the resonance, but also maintains >98% absorption at all polarization angles. The spectral position of the resonance can be tuned as much as 400 nm in visible and near-infrared regimes by tailoring geometrical parameters. The proposed device has great potential in efficient, tunable, ultra-sensitive, compact and easy-to-fabricate advanced photodetectors and color filters.

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“…The FoM of the HRA is relatively small due to the large FWHM. However, the sensitivity of the HRA is comparable with many other nanostructures, such as waveguide gratings [43][44][45] and plasmonic absorbers [46,47] in the visible and near-infrared region, and there is a good linearity between the absorption peak and the refractive index of the background. Therefore, dual-band absorption enhancement of the HRA may be suitable for sensing-related applications.…”

Section: Resultsmentioning

confidence: 96%

Dual-Band Light Absorption Enhancement in Hyperbolic Rectangular Array

Sang

Wang

et al. 2019

Applied Sciences

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The effect of dual-band light absorption enhancement in a hyperbolic rectangular array (HRA) is presented. The enhanced light absorption of the HRA results from the propagating surface plasmon (PSP) resonance, and a dual-band absorption with low and flat sideband level can be realized. The impedance theory is used to evaluate the absorption properties of the HRA, and shows that the input impedances of the HRA varied abruptly around the absorption bands to meet the impedance matching. The absorption spectra of the HRA can be estimated using the effective medium theory (EMT), and its accuracy can be improved as the number of film stacks is increased. The dual-band absorptions of the HRA are very robust to the variations of the width and the number of film stack. Potential application in refractive index sensing can be achieved by utilizing the two absorption bands.

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Dually guided-mode-resonant graphene perfect absorbers with narrow bandwidth for sensors

Cited by 38 publications

References 26 publications

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

Multiband and Broadband Absorption Enhancement of Monolayer Graphene at Optical Frequencies from Multiple Magnetic Dipole Resonances in Metamaterials

Near-absolute polarization insensitivity in graphene based ultra-narrowband perfect visible light absorber

Dual-Band Light Absorption Enhancement in Hyperbolic Rectangular Array

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