scholarly journals High-Performance Tunable Multichannel Absorbers Couple with Graphene-Based Grating and Dual-Tamm Plasmonic Multilayer Structures

2021 ◽  
Author(s):  
Jinlei Hu ◽  
Zheng-Da Hu ◽  
Jicheng Wang ◽  
Aliaksei Balmakou ◽  
Sergei Khakhomov ◽  
...  
Keyword(s):  
Strong Coupling ◽  
High Performance ◽  
Near Infrared ◽  
Chemical Potential ◽  
Matrix Theory ◽  
Grating Period ◽  
Polarization Angle ◽  
Optical Resonance ◽  
Perfect Absorption ◽  
Infrared Frequencies

Abstract We present a tunable multichannel absorbers in a hybird optical Tamm system at near-infrared frequencies. The simulation results reveal the structure capable of exciting four perfect absorption peaks, which are generated by two types of resonance, namely a guide-mode resonance (GMR) in a graphene-based grating and optical resonance induced by Tamm states in metal-photonic crystal heterostructure-metal (M-PCH-M) composites based on transfer matrix theory (TMT). The numerical and theoretical studies show that the strong coupling between the two modes gives rise to mode hybridization by adjusting the grating period. Coupled mode theory (CMT) has been employed to explain the strong coupling phenomenon. Furthermore, the active modulation of the GMR-based peak can be manipulated discretely by tuning the polarization angle or continuously by changing the chemical potential of graphene. The presented optical absorption filter is going to satisfy high level of effectiveness when developing perspective high-performance optoelectronic devices including modulators, switches, solar cells, thermal radiation and wave filters.

scholarly journals High-performance Tunable Multichannel Absorbers Couple with Graphene-based Grating and Dual-Tamm Plasmonic Structures

2021 ◽  
Author(s):  
Jinlei Hu ◽  
Zhengda Hu ◽  
Jicheng Wang ◽  
Aliaksei Balmakou ◽  
Sergei Khakhomov ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Potential ◽  
Grating Period ◽  
Polarization Angle ◽  
Perfect Absorption ◽  
Plasmonic Structures ◽  
Resonant Modes ◽  
Tamm State ◽  
High Level ◽  
Absorption Filter

Abstract We present a hybrid Tamm system targeting the tunable multichannel absorber. The proposed optical absorber is analyzed and investigated by using the transfer matrix method (TMM). The numerical and theoretical studies show that the four perfect absorption peaks are generated by two types of resonant modes excited in the structure, which can be reasonably explained by the guide-mode resonance (GMR) and optical Tamm state (OTS). More importantly, the strong interaction between the two modes gives rise to mode hybridization by adjusting the grating period. Furthermore, the active modulation of the GMR-based peak can be manipulated discretely by tuning the polarization angle or continuously by changing the chemical potential of graphene. The presented optical absorption filter will meet high level of effectiveness in developing high-performance optoelectronic devices.

A single-patterned five-band terahertz metamaterial absorber based on multiple resonance mechanisms

2018 ◽  
Vol 32 (03) ◽  
pp. 1850029 ◽  
Author(s):  
Zong-De Ju ◽  
Guo-Qing Xu ◽  
Zhi-Hua Wei ◽  
Jing Li ◽  
Qian Zhao ◽  
...  
Keyword(s):  
High Performance ◽  
Imaging System ◽  
Metamaterial Absorber ◽  
Polarization Angle ◽  
Absorption Mechanism ◽  
Perfect Absorption ◽  
Simple Method ◽  
Multiple Resonance ◽  
Resonance Modes ◽  
Single Pattern

A single-patterned five-band terahertz metamaterial absorber based on simple metal–dielectric–metal sandwich structure is investigated and demonstrated. The numerical simulations reveal the different dependence of the absorption ability on the incident polarization angle, dielectric layer, and structural dimensions of the single pattern. The extracted electric field distribution indicates that the five-band near-perfect absorption performance (average over 98%) mainly originates from the combination of LC, dipole, quadrupole, and high-order resonance. The researches on magnetic field and power loss density distributions further reveal the absorption mechanism. Moreover, additional resonance mode can be excited to form a six-band high-performance absorber only by adjusting some geometric dimensions of the single pattern with multiple resonance modes. The simple method provides us a very good idea to implement a super multi-band absorber. The proposed absorbers here can be applied in massive related fields, such as metamaterial sensors, thermal radiation, and imaging system.

scholarly journals Hybrid Nanodisk Film for Ultra-Narrowband Filtering, Near-Perfect Absorption and Wide Range Sensing

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 334 ◽  
Author(s):  
Wenli Cui ◽  
Wei Peng ◽  
Li Yu ◽  
Xiaolin Luo ◽  
Huixuan Gao ◽  
...  
Keyword(s):  
Plasmon Resonance ◽  
High Performance ◽  
Near Infrared ◽  
Structural Parameters ◽  
Normal Incidence ◽  
Plasmonic Nanostructures ◽  
Perfect Absorption ◽  
Biomedical Sensing ◽  
Wide Range ◽  
Plasmon Resonances

The miniaturization and integration of photonic devices are new requirements in the novel optics field due to the development of photonic information technology. In this paper, we report that a multifunctional layered structure of Au, SiO2 and hexagonal nanodisk film is advantageous for ultra-narrowband filtering, near-perfect absorption and sensing in a wide refractive index (RI) region. This hexagonal nanostructure presented two remarkable polarization independent plasmon resonances with near-zero reflectivity and near-perfect absorptivity under normal incidence in the visible and near-infrared spectral ranges. The narrowest full width at half maximum (FWHM) of these resonances was predicted to be excellent at 5 nm. More notably, the double plasmon resonances showed extremely obvious differences in RI responses. For the first plasmon resonance, an evident linear redshift was observed in a wide RI range from 1.00 to 1.40, and a high RI sensitivity of 600 nm/RIU was obtained compared to other plasmonic nanostructures, such as square and honeycomb-like nanostructures. For the second plasmon resonance with excellent FWHM at 946 nm, its wavelength position almost remained unmovable in the case of changing RI surrounding nanodisks in the same regime. Most unusually, its resonant wavelength was insensitive to nearly all structural parameters except the structural period. The underlying physical mechanism was analyzed in detail for double plasmon resonances. This work was significant in developing high-performance integrated optical devices for filtering, absorbing and biomedical sensing.

scholarly journals Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

2021 ◽  
Author(s):  
Aliakbar Mashkour ◽  
Amangaldi Koochaki ◽  
Ali Abdolahzadeh Ziabari ◽  
Azadeh Sadat Naeimi
Keyword(s):  
Near Infrared ◽  
Chemical Potential ◽  
Infrared Region ◽  
Geometrical Parameters ◽  
Silica Layer ◽  
Q Factor ◽  
Optical Modulators ◽  
Perfect Absorption ◽  
Central Wavelength ◽  
Metal Insulator Metal

Abstract In this paper a Metal-Insulator-Metal (MIM) plasmonic absorber consisting of asymmetric double bars with bent arms located on top of a silica layer coated on a metal film is proposed, and its resonant features are analyzed. The suggested structure supports both Fano and dipole perfect absorption resonances at the Near-Infrared Region (NIR). The asymmetry introduced into the structure can be induced by changing the bending angle or rotation angle of one of the antennas while the other one remains fixed. Simulation results demonstrate that by applying both asymmetry factors to the structure, one can have two individual Fano peaks at the same time. It is shown that the magnitude, central wavelength and line-width of the Fano peaks are adjustable by controlling the geometrical parameters of the structure. It is also indicated that, the quality factor (Q-factor) of the Fano resonance is inversely related to the degree of asymmetry introduced into the structure. According to the simulations, an ultra-narrow resonance peak with a bandwidth of 1.87 nm at the wavelength of 710 nm (corresponding to a Q-factor of 387) can be obtained by controlling the geometrical parameters. It is also discussed that, the absorptivity of Fano and the dipole peaks can be adjusted inversely, by manipulating the grapheme chemical potential. The ratio of the absorptivity to the chemical potential of graphene about-275 %/eV and 226 %/eV is calculated for the Fano peak and dipole peak, respectively. Accordingly, the presented structure is an adjustable NIR absorber with a fully tunable absorption spectrum which can be utilized in various applications from tunable reflectors and photo-detectors to ultra-narrowband and broadband optical modulators.

scholarly journals A Perfect Absorber Based on Similar Fabry-Perot Four-Band in the Visible Range

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 488 ◽  
Author(s):  
Pinghui Wu ◽  
Congfen Zhang ◽  
Yijun Tang ◽  
Bin Liu ◽  
Li Lv
Keyword(s):  
Near Infrared ◽  
Layer Structure ◽  
Incident Angle ◽  
Middle Layer ◽  
Absorption Efficiency ◽  
Visible Range ◽  
Polarization Angle ◽  
Perfect Absorber ◽  
Perfect Absorption ◽  
Fabry Perot

A simple metamaterial absorber is proposed to achieve near-perfect absorption in visible and near-infrared wavelengths. The absorber is composed of metal-dielectric-metal (MIM) three-layer structure. The materials of these three-layer structures are Au, SiO2, and Au. The top metal structure of the absorber is composed of hollow three-dimensional metal rings regularly arranged periodically. The results show that the high absorption efficiency at a specific wavelength is mainly due to the resonance of the Fabry–Perot effect (FP) in the intermediate layer of the dielectric medium, resulting in the resonance light being trapped in the middle layer, thus improving the absorption efficiency. The almost perfect multiband absorption, which is independent of polarization angle and insensitivity of incident angle, lends the absorber great application prospects for filtering and optoelectronics.

scholarly journals Graphene Nanoribbon Gap Waveguides for Dispersionless and Low-Loss Propagation with Deep-Subwavelength Confinement

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1302
Author(s):  
Zhiyong Wu ◽  
Lei Zhang ◽  
Tingyin Ning ◽  
Hong Su ◽  
Irene Ling Li ◽  
...  
Keyword(s):  
High Performance ◽  
Chemical Potential ◽  
Shape Change ◽  
Optical Switch ◽  
Pulse Amplitude ◽  
Propagation Distance ◽  
Graphene Nanoribbon ◽  
Low Loss ◽  
High Loss ◽  
On Chip

Surface plasmon polaritons (SPPs) have been attracting considerable attention owing to their unique capabilities of manipulating light. However, the intractable dispersion and high loss are two major obstacles for attaining high-performance plasmonic devices. Here, a graphene nanoribbon gap waveguide (GNRGW) is proposed for guiding dispersionless gap SPPs (GSPPs) with deep-subwavelength confinement and low loss. An analytical model is developed to analyze the GSPPs, in which a reflection phase shift is employed to successfully deal with the influence caused by the boundaries of the graphene nanoribbon (GNR). It is demonstrated that a pulse with a 4 μm bandwidth and a 10 nm mode width can propagate in the linear passive system without waveform distortion, which is very robust against the shape change of the GNR. The decrease in the pulse amplitude is only 10% for a propagation distance of 1 μm. Furthermore, an array consisting of several GNRGWs is employed as a multichannel optical switch. When the separation is larger than 40 nm, each channel can be controlled independently by tuning the chemical potential of the corresponding GNR. The proposed GNRGW may raise great interest in studying dispersionless and low-loss nanophotonic devices, with potential applications in the distortionless transmission of nanoscale signals, electro-optic nanocircuits, and high-density on-chip communications.

High-performance near-infrared photodetectors based on C3N quantum dots integrated with single-crystal graphene

2021 ◽  
Author(s):  
Yun Zhao ◽  
Xiaoqiang Feng ◽  
Menghan Zhao ◽  
Xiaohu Zheng ◽  
Zhiduo Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Electric Field ◽  
Single Crystal ◽  
High Performance ◽  
Near Infrared ◽  
Fast Response ◽  
Local Electric Field ◽  
Infrared Photodetectors ◽  
Photocurrent Response

Employing C3N QD-integrated single-crystal graphene, photodetectors exhibited a distinct photocurrent response at 1550 nm. The photocurrent map revealed that the fast response derive from C3N QDs that enhanced the local electric field near graphene.

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