Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Characteristic extinction cross section of a nanodisk (60 nm in diameter and Fermi energy E F = 0.4 eV), dominated by a pronounced dipolar plasmon and strong near-field enhancement. Solid curve: Full electrodynamic calculation. Dashed curve: Fit to a Lorentzian polarizability. Inset: Near-field intensity normalized to incident intensity for plane-wave illumination with polarization parallel to the disk. ( b ) Normal-incidence absorbance by graphene disk arrays supported on a dielectric-coated gold surface (see the inset) for various values of the dielectric film thickness. Reproduced from reference , with permission from American Physical Society, 2012.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

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Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Schematic depiction of the absorption structure by coupling unpatterned graphene with dielectric bricks. ( b ) Calculated absorption spectrum of the designed structure shown in ( a ) under normal incidence . ( c ) Schematic illustration of the absorption structure by coupling unpatterned graphene with dielectric wires. ( d ) Calculated absorption spectrum of the designed structure shown in ( c ) for TM polarization under normal incidence . Reproduced from references [ , ], with permission from Optical Society of America, 2018; with permission from Optical Society of America, 2017.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

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Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Schematic illustration of coherent absorption in a nanostructured graphene, accompanied by the phase modulation of coherent absorption at the resonance wavelength of 8.476 µm . ( b ) Left: schematic of a graphene ribbon meta-surface illustrated by two counter propagating and coherently modulated input beams. Right: The difference ( | r | − | t | ) of the scattering coefficients for the graphene meta-surface as functions of frequency and Fermi energy E F , the solid blue line indicates quasi-CPA points where | r | = | t | . Reproduced from references [ , ], with permission from Optical Society of America, 2014; with permission from Nature Publishing Group, 2015.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

Techniques:

Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Left: schematic image of the perfect absorption structure realized by coupling graphene with 1D PMMA grating. Middle: SEM image of a fabricated structure, the scale bar equals 5 μm. Right: measured (solid line) and simulated (dashed line) absorption spectra of structures with different grating periods under normal incidence of a white light source with TE polarization . ( b ) Left: schematic image of the perfect absorption structure realized by coupling graphene with 2D subwavelength grating. Middle: measured (dot line) and simulated (dashed line) spectra of a fabricated perfect absorption structure. Right: measured (dot line) and simulated (dashed line) spectra of a resonant structure without graphene . Reproduced from references [ , ], with permission from Wiley, 2016; with permission from Optical Society of America, 2017.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

Techniques:

Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Schematic of the waveguide-cavity (covered by graphene)-waveguide (WCW) system. ( b ) The absorption of graphene with a length of 1.7 μm when N C = 3. Reproduced from reference , with permission from Optical Society of America, 2015.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

Techniques:

Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Schematic drawing of the graphene microcavity photodetector. Distributed Bragg mirrors form a high finesse optical cavity. ( b ) Spectral response of the bilayer graphene device. The dashed lines show calculation results: reflection R (red), transmission T (green), and absorption A (blue). The solid lines are measurement results: photoresponse for the device with cavity (blue) and photoresponse for the device without cavity (red). Reproduced from reference , with permission from American Chemical Society, 2012.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

Techniques: Transmission Assay

Journal: Nanomaterials

Article Title: Graphene-Based Perfect Absorption Structures in the Visible to Terahertz Band and Their Optoelectronics Applications

doi: 10.3390/nano8121033

Figure Lengend Snippet: ( a ) Top: schematic of the ultrathin optical modulator based on a tunable metasurface absorber. Bottom: a SEM image of the metasurface on graphene. Inset: a zoomed-in view of a portion of the metasurface. ( b ) The modulation depth achieved experimentally at different wavelength and corresponding insertion loss for the structure shown in ( a ) . ( c ) Top: schematic of a perfect absorption structure incorporating graphene plasmonic ribbons and plasmonic metallic antennas. Bottom: a SEM image of the top structure. ( d ) Absorption of the structure shown in ( c ) as a function of graphene Fermi level ( E F ) at the frequency for maximum absorption . Reproduced from references [ , ], with permission from American Chemical Society, 2014; with permission from American Chemical Society, 2018.

Article Snippet: The theoretical work discussed above may provide an effective way to enhance the performance of chip-integrated graphene photodetectors.

Techniques: