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 Near-infrared coherent perfect absorption in plasmonic metal-insulator-metal waveguide

2015 ◽  
Vol 23 (19) ◽  
pp. 24464 ◽  
Author(s):  
Hyeonsoo Park ◽  
Seong-Yeol Lee ◽  
Joonsoo Kim ◽  
Byoungho Lee ◽  
Hwi Kim
Keyword(s):  
Near Infrared ◽  
Perfect Absorption ◽  
Metal Insulator ◽  
Coherent Perfect Absorption ◽  
Metal Waveguide ◽  
Metal Insulator Metal

scholarly journals Research on Fano Resonance Sensing Characteristics Based on Racetrack Resonant Cavity

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1359
Author(s):  
Yaxin Yu ◽  
Jiangong Cui ◽  
Guochang Liu ◽  
Rongyu Zhao ◽  
Min Zhu ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Fano Resonance ◽  
Near Infrared ◽  
Resonant Cavity ◽  
High Sensitivity ◽  
Infrared Region ◽  
Optical Integrated Circuits ◽  
Element Simulation ◽  
Metal Insulator Metal ◽  
Sensing Characteristics

To reduce the loss of the metal–insulator–metal waveguide structure in the near-infrared region, a plasmonic nanosensor structure based on a racetrack resonant cavity is proposed herein. Through finite element simulation, the transmission spectra of the sensor under different size parameters were analyzed, and its influence on the sensing characteristics of the system was examined. The analysis results show that the structure can excite the double Fano resonance, which has a distinctive dependence on the size parameters of the sensor. The position and line shape of the resonance peak can be adjusted by changing the key parameters. In addition, the sensor has a higher sensitivity, which can reach 1503.7 nm/RIU when being used in refractive index sensing; the figure of merit is 26.8, and it can reach 0.75 nm/°C when it is used in temperature sensing. This structure can be used in optical integrated circuits, especially high-sensitivity nanosensors.

scholarly journals High Q Resonant Graphene Absorber with Lossless Phase Change Material Sb2S3

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2820
Author(s):  
Qi Meng ◽  
Xingqiao Chen ◽  
Wei Xu ◽  
Zhihong Zhu ◽  
Shiqiao Qin ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Near Infrared ◽  
Infrared Region ◽  
Q Factor ◽  
Thermal Emitters ◽  
Crystallization Fraction ◽  
Q Factors ◽  
Refractive Index Grating ◽  
Change Material

Graphene absorbers have attracted lots of interest in recent years. They provide huge potential for applications such as photodetectors, modulators, and thermal emitters. In this letter, we design a high-quality (Q) factor resonant graphene absorber based on the phase change material Sb2S3. In the proposed structure, a refractive index grating is formed at the subwavelength scale due to the periodical distributions of amorphous and crystalline states, and the structure is intrinsically flat. The numerical simulation shows that nearly 100% absorption can be achieved at the wavelength of 1550 nm, and the Q factor is more than hundreds due to the loss-less value of Sb2S3 in the near-infrared region. The absorption spectra can be engineered by changing the crystallization fraction of the Sb2S3 as well as by varying the duty cycle of the grating, which can be employed not only to switch the resonant wavelength but also to achieve resonances with higher Q factors. This provides a promising method for realizing integrated graphene optoelectronic devices with the desired functionalities.

scholarly journals Bismuth-based metamaterials: from narrowband reflective color filter to extremely broadband near perfect absorber

Nanophotonics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 823-832 ◽  
Author(s):  
Amir Ghobadi ◽  
Hodjat Hajian ◽  
Murat Gokbayrak ◽  
Bayram Butun ◽  
Ekmel Ozbay
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Solar Irradiation ◽  
Color Filter ◽  
Visible Range ◽  
Perfect Absorber ◽  
Perfect Absorption ◽  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Sub Wavelength

AbstractIn recent years, sub-wavelength metamaterials-based light perfect absorbers have been the subject of many studies. The most frequently utilized absorber configuration is based on nanostructured plasmonic metals. However, two main drawbacks were raised for this design architecture. One is the fabrication complexity and large scale incompatibility of these nano units. The other one is the inherent limitation of these common metals which mostly operate in the visible frequency range. Recently, strong interference effects in lithography-free planar multilayer designs have been proposed as a solution for tackling these drawbacks. In this paper, we reveal the extraordinary potential of bismuth (Bi) metal in achieving light perfect absorption in a planar design through a broad wavelength regime. For this aim, we adopted a modeling approach based on the transfer matrix method (TMM) to find the ideal conditions for light perfect absorption. According to the findings of our modeling and numerical simulations, it was demonstrated that the use of Bi in the metal-insulator-metal-insulator (MIMI) configuration can simultaneously provide two distinct functionalities; a narrow near unity reflection response and an ultra-broadband near perfect absorption. The reflection behavior can be employed to realize additive color filters in the visible range, while the ultra-broadband absorption response of the design can fully harvest solar irradiation in the visible and near infrared (NIR) ranges. The findings of this paper demonstrate the extraordinary potential of Bi metal for the design of deep sub-wavelength optical devices.

scholarly journals Design and Fabrication of a Wavelength-Selective Near-Infrared Metasurface Emitter for a Thermophotovoltaic System

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 157 ◽  
Author(s):  
Atsushi Sakurai ◽  
Yuki Matsuno
Keyword(s):  
Near Infrared ◽  
Underlying Mechanism ◽  
Infrared Region ◽  
Spectral Emissivity ◽  
Metal Insulator ◽  
Metal Insulator Metal ◽  
Thermal Emitter ◽  
Wavelength Selectivity ◽  
Selective Thermal Emitter ◽  
Difference Time

In this study, a tungsten-SiO2-based metal–insulator–metal-structured metasurface for the thermal emitter of the thermophotovoltaic system was designed and fabricated. The proposed emitter was fabricated by applying the photolithography method. The fabricated emitter has high emissivity in the visible to near-infrared region and shows excellent wavelength selectivity. This spectral emissivity tendency agreed well with the result calculated by the finite-difference time-domain method. Additionally, the underlying mechanism of its emission was scrutinized. Study of the fabrication process and theoretical mechanisms of the emission, clarified in this research, will be fundamental to design the wavelength-selective thermal emitter.

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 Plasmonic Refractive Index Sensor with High Figure of Merit Based on Concentric-Rings Resonator

2017 ◽  
Author(s):  
Zhaojian Zhang ◽  
Junbo Yang ◽  
Xin He ◽  
Jingjing Zhang ◽  
Jie Huang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Near Infrared ◽  
Optical Resolution ◽  
Infrared Region ◽  
Refractive Index Sensor ◽  
Plasmonic Sensor ◽  
Special Cases ◽  
Metal Insulator Metal ◽  
High Figure

A plasmonic refractive index (RI) sensor based on metal-insulator-metal (MIM) waveguide coupled with concentric double rings resonator (CDRR) is proposed and investigated numerically. Utilizing the novel supermodes of the CDRR, the FWHM of the resonant wavelength can be modulated, and a sensitivity of 1060 nm/RIU with high figure of merit (FOM) 203.8 is realized in the near-infrared region. The unordinary modes as well as the influence of structure parameters on the sensing performance are also discussed. Such plasmonic sensor with simple framework and high optical resolution could be applied to on-chip sensing systems and integrated optical circuits. Besides, the special cases of bio- sensing and triple rings are also discussed.

scholarly journals Passively Q-Switched Yb:CALGO Laser Based on Mo:BiVO4 Absorber

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2364
Author(s):  
Lina Zhao ◽  
Ye Yuan ◽  
Luyang Tong ◽  
Wenyu Zhang ◽  
Zhongshuai Zhang ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Peak Power ◽  
Near Infrared ◽  
Maximum Output Power ◽  
Single Pulse ◽  
Infrared Region ◽  
Maximum Output ◽  
Linear Absorption ◽  
Central Wavelength ◽  
Transmission Electron

A stable, passively Q-switched Yb:CaGdAlO4 laser based on Mo:BiVO4 saturable absorber was demonstrated. Close observations of the structure and morphology of the nanoparticles by using transmission electron microscope, Raman spectrum and linear absorption were measured. The nonlinear transmission of Mo:BiVO4 was characterized by a 30 ps laser with a central wavelength of 1064 nm and a repetition rate of 10 Hz. The experimental maximum output power of the pulsed laser was 510 mW with a repetition rate of 87 kHz and pulse width of 3.18 μs, corresponding to a peak power of 1.84 W and a single pulse energy of 5.8 μJ. The experimental results indicate that Mo:BiVO4-SA is a great candidate for passively Q-switched lasers in the near infrared region.

scholarly journals Ultrathin and Electrically Tunable Metamaterial with Nearly Perfect Absorption in Mid-Infrared

2019 ◽  
Vol 9 (16) ◽  
pp. 3358 ◽  
Author(s):  
Yuexin Zou ◽  
Jun Cao ◽  
Xue Gong ◽  
Ruijie Qian ◽  
Zhenghua An
Keyword(s):  
Resonant Mode ◽  
Infrared Region ◽  
Perfect Absorber ◽  
Geometrical Structures ◽  
Material Loss ◽  
Absorption Region ◽  
Perfect Absorption ◽  
Mid Infrared ◽  
Wide Range ◽  
Metal Insulator Metal

Metamaterials integrated with graphene exhibit tremendous freedom in tailoring their optical properties, particularly in the infrared region, and are desired for a wide range of applications, such as thermal imaging, cloaking, and biosensing. In this article, we numerically and experimentally demonstrate an ultrathin (total thickness < λ 0 / 15 ) and electrically tunable mid-infrared perfect absorber based on metal–insulator–metal (MIM) structured metamaterials. The Q-values of the absorber can be tuned through two rather independent parameters, with geometrical structures of metamaterials tuning radiation loss (Qr) of the system and the material loss (tanδ) to further change mainly the intrinsic loss (Qa). This concise mapping of the structural and material properties to resonant mode loss channels enables a two-stage optimization for real applications: geometrical design before fabrication and then electrical tuning as a post-fabrication and fine adjustment knob. As an example, our device demonstrates an electrical and on-site tuning of ~5 dB change in absorption near the perfect absorption region. Our work provides a general guideline for designing and realizing tunable infrared devices and may expand the applications of perfect absorbers for mid-infrared sensors, absorbers, and detectors in extreme spatial-limited circumstances.

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