Tunable bidirectional perfect THz absorber realized by graphene-based one-dimensional photonic crystals

Zhang, Pingsheng; Deng, Xiaobing; Liu, Hongfei; Yuan, Jiren

doi:10.1007/s11082-023-04555-9

Cited by 6 publications

(3 citation statements)

References 37 publications

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“…These PCs are periodic structures made of two dielectric media having a larger refractive index contrast as compared to other optical components, thus enabling photonic bandgaps (PBGs) as prohibited frequency/ wavelength bands that are similar to the energy bands obtained in the case of electronic waves through periodic potential of ions in the solid crystal [5]. PCs are generally made of dielectric media, but other materials like metals, chalcogenide, semiconductors and gyroidal graphene were also introduced in place of dielectrics as reported by several workers [6][7][8][9][10][11][12][13]. With the introduction of new dispersive and smart materials like plasma, magnetized cold plasma, graphene, superconductor, liquid crystal and metamaterial, the field of PC research finds applications in diverse fields of science and technology [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a gas sensor based on one-dimensional photonic crystal structure with a designed defect cavity

et al. 2023

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A symmetric one-dimensional photonic crystal configuration with defect layer is proposed for an optical gas sensor based device application. Here, Silicon and Si3N4 are considered as materials of dielectric layers with zero value of extinction coefficient in the wavelength range of concern. The transmission of PC configuration is estimated using the transfer matrix approach in case of configuration with and without defect, and the infiltrated gas is treated as defect layer. On the basis of the defect mode’s wavelength, gas can be determined. In addition, quality factor and sensitivity of the device are improved due to the variation of refractive index of layer B, thickness of defect, angle of incidence and the number of unit cells on either side of defect layer. By making analysis of the effect of these parameters on the sensitivity and quality factor, interesting results have been obtained and conclusions drawn. We have also proposed and investigated a symmetric structure with defect made with a single material to improve optical sensing parameters. Further for the sake of comparison, the various gases are used to show improved sensing characteristics for respective gases, which can be used to determine gas. It is inferred that such refractive index optical sensor based on defect mode position is highly sensitive and offers precise optical sensing characteristics and possibly find applications in gas detection.

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Section: Introductionmentioning

confidence: 99%

Analysis of a gas sensor based on one-dimensional photonic crystal structure with a designed defect cavity

et al. 2023

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“…These windows offer energy savings, cost efficiency, and affordability. The increasing architectural trend toward using more glass, coupled with the demand for energy conservation, presents a unique opportunity for smart windows [20][21][22][23][24][25]. Smart shades: Smart shades, composed of zinc and steel, utilize shape memory alloy wires to monitor sunlight entering structures and regulate CO2 levels.…”

Section: Innovative Techniques In Smart Structuresmentioning

confidence: 99%

Smart materials for sustainable energy

Bhattacharjee,

Roy

2024

Nat. Resour. Conserv. Res.

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In the new era of technologies, different smart or responsive materials are used which can respond to external stimuli, such as a specific amount of mechanical stress, pressure, temperature, pH, or sunlight radiations, by modifying their shape or dimensions or mechanical properties. As global temperatures rise and weather patterns become more erratic and severe. The risk to communities with energy-passive structures is growing, smart materials such as smart rooftops, thermoelectrics, photovoltaics, pyroelectrics, chromoactive, photoluminescent, as well as other innovations, help to conserve renewable energy smartly and sustainably. This review paper reflects on the applications of different smart materials as renewable smart resources. Intelligent quantum dot solar cells, Schottky solar cells, organic thin-film photovoltaic cells, dye-sensitized solar cells (DSSCs), and organic-inorganic heterojunction solar cells have high conversion efficiency, low cost, and possess wide absorption spectra that reach the near-infrared range. Biomechanical energy can be transformed into green energy using triboelectric and piezoelectric-based smart nanogenerators such as zinc oxide nanowires. Shape memory materials such as Nitinol (NiTi) have been embedded in the wind turbine blades to enhance aerodynamic efficiency. Piezoelectric nanogenerators can convert mechanical energy directly into electrical energy by using wireless sensors to harvest energy from moving water in hydroelectric power plants. Thermoelectric materials such as silver antimony telluride (AgSbTe2) offer a sustainable energy option, which employs industrial waste heat to produce power. Smart materials like graphene are more reliable and effective than carbon nanotubes for storing green hydrogen. Smart non-enzymatic biofuel cells are used in biomedical gadgets such as anesthesia machines and pacemakers, which are self-powered and have great sensitivity. Shape memory materials (SMM) are introduced in natural gas and oil reservoirs because they offer exceptional qualities such as the shape memory effect (SME), lightweight, corrosion resistance, and superelasticity, which enhance the performance and robustness of offshore industries. These new advancements, challenges, and applications of smart materials for renewable energy are covered in this review paper.

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“…These devices can exhibit simultaneous narrowband or broadband absorption in different directions of wave propagation [21,22], or exhibit narrowband absorption in one direction and reflection in another [23]. While some progress has been achieved in bidirectional multifunctional THz modulating devices, there is still a huge potential for obtaining greater absorptivity, absorption bandwidth, and functional integration.…”

Section: Introductionmentioning

confidence: 99%

A bidirectional broadband multifunctional terahertz device based on vanadium dioxide

Li,

Liang,

Bao

et al. 2024

Preprint

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We propose a bidirectional and switchable terahertz absorber/reflector, utilizing vanadium dioxide. Detailed simulations reveal that the device is capable of achieving broadband absorption and reflection by manipulating the phase state of vanadium dioxide. Specifically, when vanadium dioxide is in its insulating phase, the device exhibits exceptional bidirectional broadband absorption characteristics, with an absorptivity exceeding 90% across a frequency range of 1.9 THz to 10 THz for both forward and backward TE/TM-polarized incident waves. Notably, this absorption behavior remains robust regardless of the polarization angle of the incident wave. When vanadium dioxide transitions to its metal phase, the device demonstrates a reflectivity of over 90% in the lower frequency range for forward and backward TE-polarized incident waves. In the higher frequency range, the device exhibits both reflection and absorption effects for TE-polarized waves. The performance of the device is insensitive to the angle of incidence of electromagnetic waves whether the vanadium dioxide is in the insulating or metallic phase. Furthermore, when the device is used as an absorber (reflector), changes in vanadium dioxide conductivity do not affect the stable performance of the device at high (low) frequencies. Given its versatility and high efficiency, the device has promising applications in a number of fields such as terahertz energy harvesting, sensing, optical switching and shielding.

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Tunable bidirectional perfect THz absorber realized by graphene-based one-dimensional photonic crystals

Cited by 6 publications

References 37 publications

Analysis of a gas sensor based on one-dimensional photonic crystal structure with a designed defect cavity

Analysis of a gas sensor based on one-dimensional photonic crystal structure with a designed defect cavity

Smart materials for sustainable energy

A bidirectional broadband multifunctional terahertz device based on vanadium dioxide

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