scholarly journals A Three-Dimensional Dual-Band Terahertz Perfect Absorber as a Highly Sensitive Sensor

2021 ◽  
Vol 9 ◽  
Author(s):  
Wei Yin ◽  
Zhonglei Shen ◽  
Shengnan Li ◽  
Liuyang Zhang ◽  
Xuefeng Chen
Keyword(s):  
Impedance Matching ◽  
Three Dimensional ◽  
Interfacial Area ◽  
Absorption Efficiency ◽  
Matching Theory ◽  
Dual Band ◽  
Perfect Absorber ◽  
Sensing Applications ◽  
Highly Sensitive ◽  
Wide Range

Terahertz (THz) absorbers are highly desirable in sensing and detection devices. Herein, we have proposed a 3D dual-band near-perfect absorber that works in the THz regime for sensing applications. The theoretical calculation shows that the absorption efficiency of the absorber can reach 99.0 and 97.0% at 1.125 and 1.626 THz, respectively. Double absorption peaks can be tuned independently by alternating the geometric parameters of unit resonators. The underlying physical mechanism of the absorber matches well with the well-known impedance matching theory. Compared with its planar counterpart, our proposed absorber exhibits a figure of merit enhancement of at least two times due to its out-of-plane induced large interfacial area. Additionally, the absorber can work robustly at a wide range of incident angles and keep insensitive to polarization states, which renders it great for highly sensitive sensing.

Analysis of a Novel Y-Y Micromixer for Mixing at a Wide Range of Reynolds Numbers

2016 ◽  
Vol 138 (9) ◽  
Author(s):  
Vladimir Viktorov ◽  
Carmen Visconte ◽  
Md Readul Mahmud
Keyword(s):  
Three Dimensional ◽  
Interfacial Area ◽  
Reynolds Numbers ◽  
Mixing Efficiency ◽  
Change Of Direction ◽  
Analysis Technique ◽  
Wide Range ◽  
Passive Micromixer ◽  
In Series ◽  
Flow Through

A novel passive micromixer, denoted as the Y-Y mixer, based on split-and-recombine (SAR) principle is proposed and studied both experimentally and numerically over Reynolds numbers ranging from 1 to 100. Two species are supplied to a prototype via a Y inlet, and flow through four identical elements repeated in series; the width of the mixing channel varies from 0.4 to 0.6 mm, while depth is 0.4 mm. An image analysis technique was used to evaluate mixture homogeneity at four target areas along the mixer. Numerical simulations were found to be a useful support for observing the complex three-dimensional flow inside the channels. Comparison with a known mixer, the tear-drop one, based on the same SAR principle, was also performed, to have a point of reference for evaluating performances. A good agreement was found between numerical and experimental results. Over the examined range of Reynolds numbers Re, the Y-Y micromixer showed at its exit an almost flat mixing characteristic, with a mixing efficiency higher than 0.9; conversely, the tear-drop mixer showed a relevant decrease of efficiency at the midrange. The good performance of the Y-Y micromixer is due to the three-dimensional 90 deg change of direction that occurs in its channel geometry, which causes a fluid swirling already at the midrange of Reynolds numbers. Consequently, the fluid path is lengthened and the interfacial area of species is increased, compensating for the residence time reduction.

scholarly journals Recent development of SPR spectroscopy as potential method for diagnosis of dengue virus E-protein

Sensor Review ◽  
2018 ◽  
Vol 38 (1) ◽  
pp. 106-116 ◽  
Author(s):  
Nur Alia Sheh Omar ◽  
Yap Wing Fen
Keyword(s):  
Thin Films ◽  
Dengue Virus ◽  
Three Dimensional ◽  
Optical Biosensor ◽  
Future Research ◽  
Multilayer Thin Films ◽  
Content Type ◽  
Sensing Applications ◽  
E Protein ◽  
Wide Range

Purpose This paper aims to review the potential application of surface plasmon resonance (SPR) in diagnosis of dengue virus (DENV-2) E-protein and the development of SPR to become an alternative DENV sensor. Design/methodology/approach In this review, the existing standard laboratory techniques to diagnosis of DENV are discussed, together with their drawbacks. To overcome these drawbacks, SPR has been aimed to be a valuable optical biosensor for identification of antibodies to the DENV antigen. The review also includes the future studies on three-dimensional poly(amidoamine) (PAMAM) dendrimer-surface-assembled monolayer (SAM)-Au multilayer thin films, which are envisaged to have high potential sensitive and selective detection ability toward target E-proteins. Findings Application of SPR in diagnosis of DENV emerged over recent years. A wide range of immobilized biorecognition molecules have been developed to combine with SPR as an effective sensor. The detection limit, sensitivity and selectivity of SPR sensing in DENV have been enhanced from time to time, until the present. Originality/value The main purpose of this review is to provide authors with up-to-date and useful information on sensing DENV using SPR and to introduce a novel three-dimensional PAMAM-SAM-Au multilayer thin films for future research on SPR sensing applications.

scholarly journals Narrowband perfect metasurface absorber based on impedance matching

2020 ◽  
Vol 12 (3) ◽  
pp. 88
Author(s):  
Muhammad Ali Butt ◽  
Nikolai Lvovich Kazansky
Keyword(s):  
Refractive Index ◽  
Optical Materials ◽  
Near Infrared ◽  
Impedance Matching ◽  
Gold Layer ◽  
Perfect Absorber ◽  
Angle Of Incidence ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Metal Insulator Metal

We presented a numerical investigation of a metamaterial narrowband perfect absorber conducted via a finite element method based on commercially available COMSOL software. The periodic array of silicon meta-atoms (MAs) are placed on 80 nm thick gold layer. The broadband light at normal incidence is blocked by the gold layer and silicon MAs are used to excite the surface plasmon by scattering light through it. Maximum absorption of 95.7 % is obtained at the resonance wavelength of 1137.5 nm due to the perfect impedance matching of the electric and magnetic dipoles. The absorption is insensitive to the wide-angle of incidence ranging from 0 to 80 degrees. We believe that the proposed metamaterial device can be utilized in solar photovoltaic and biochemical sensing applications. Full Text: PDF ReferencesY. Cheng, X.S. Mao, C. Wu, L. Wu, R.Z. Gong, "Infrared non-planar plasmonic perfect absorber for enhanced sensitive refractive index sensing", Optical Materials, 53, 195-200 (2016). CrossRef S. S. Mirshafieyan, D.A. Gregory, "Electrically tunable perfect light absorbers as color filters and modulators", Scientific Reports,8, 2635 (2018). CrossRef D.M. Nguyen, D. Lee, J. Rho, "Control of light absorbance using plasmonic grating based perfect absorber at visible and near-infrared wavelengths", Scientific Reports, 7, 2611 (2017). CrossRef Y. Sun, Y. Ling, T. Liu, L. Huang, "Electro-optical switch based on continuous metasurface embedded in Si substrate", AIP Advances, 5, 117221 (2015). CrossRef H. Chu, Q. Li, B. Liu, J. Luo, S. Sun, Z. H. Hang, L. Zhou, Y. Lai, "A hybrid invisibility cloak based on integration of transparent metasurfaces and zero-index materials", Light: Science & Applications, 7, 50 (2018). CrossRef S. K. Patel, S. Charola, J. Parmar, M. Ladumor, "Broadband metasurface solar absorber in the visible and near-infrared region", Materials Research Express, 6, 086213 (2019). CrossRef Q. Qian, S. Ti, C. Wang, "All-dielectric ultra-thin metasurface angular filter", Optics Letters, 44, 3984 (2019). CrossRef P. Yu et al., "Broadband Metamaterial Absorbers", Advanced Optical Materials, 7, 1800995 (2019). CrossRef Y. J. Kim et al., "Flexible ultrathin metamaterial absorber for wide frequency band, based on conductive fibers", Science and Technology of advanced materials, 19, 711-717 (2018). CrossRef N.L. Kazanskiy, S.N. Khonina, M.A. Butt, "Plasmonic sensors based on Metal-insulator-metal waveguides for refractive index sensing applications: A brief review", Physica E, 117, 113798 (2020). CrossRef H. E. Nejad, A. Mir, A. Farmani, "Supersensitive and Tunable Nano-Biosensor for Cancer Detection", IEEE Sensors Journal, 19, 4874-4881 (2019). CrossRef

Tunable dual-band plasmonic perfect absorber and its sensing applications

2019 ◽  
Vol 36 (10) ◽  
pp. 2750 ◽  
Author(s):  
Leilei Shi ◽  
Qian Tang ◽  
Zhengqi Liu ◽  
Ye Liu ◽  
Yuyin Li ◽  
...  
Keyword(s):  
Dual Band ◽  
Perfect Absorber ◽  
Sensing Applications

Design of a metasurface-based dual-band Terahertz perfect absorber with very high Q-factors for sensing applications

2018 ◽  
Vol 416 ◽  
pp. 152-159 ◽  
Author(s):  
M. Janneh ◽  
A. De Marcellis ◽  
E. Palange ◽  
A.T. Tenggara ◽  
D. Byun
Keyword(s):  
Dual Band ◽  
Perfect Absorber ◽  
High Q ◽  
Sensing Applications ◽  
Q Factors ◽  
Very High

scholarly journals Aerogels for Biomedical, Energy and Sensing Applications

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 264
Author(s):  
Muhammad Tayyab Noman ◽  
Nesrine Amor ◽  
Azam Ali ◽  
Stanislav Petrik ◽  
Radek Coufal ◽  
...  
Keyword(s):  
High Performance ◽  
Structural Characteristics ◽  
Low Cost ◽  
Three Dimensional ◽  
Strain Sensors ◽  
High Porosity ◽  
Energy Materials ◽  
Sensing Applications ◽  
Highly Sensitive ◽  
Solid State Structures

The term aerogel is used for unique solid-state structures composed of three-dimensional (3D) interconnected networks filled with a huge amount of air. These air-filled pores enhance the physicochemical properties and the structural characteristics in macroscale as well as integrate typical characteristics of aerogels, e.g., low density, high porosity and some specific properties of their constituents. These characteristics equip aerogels for highly sensitive and highly selective sensing and energy materials, e.g., biosensors, gas sensors, pressure and strain sensors, supercapacitors, catalysts and ion batteries, etc. In recent years, considerable research efforts are devoted towards the applications of aerogels and promising results have been achieved and reported. In this thematic issue, ground-breaking and recent advances in the field of biomedical, energy and sensing are presented and discussed in detail. In addition, some other perspectives and recent challenges for the synthesis of high performance and low-cost aerogels and their applications are also summarized.

scholarly journals Wide-angle infrared plasmonic perfect absorber based on graphene-silica grating

2021 ◽  
Vol 51 (1) ◽  
Author(s):  
Fang Chen
Keyword(s):  
Chemical Potential ◽  
Dual Band ◽  
Infrared Range ◽  
Perfect Absorber ◽  
Spectral Position ◽  
Wide Angle ◽  
Perfect Absorption ◽  
Layer Graphene ◽  
Wide Range ◽  
Graphene Strip

In this paper, wide-angle infrared perfect absorption has been demonstrated by using a double-layer graphene strip grating coupled with a silicon dioxide grating. Numerical simulation of the finite-difference time-domain method indicates that the perfect absorption can be achieved due to the effective impedance matching, and all the incident electromagnetic energy is confined in the Al2O3 layer between the silver substrate and the graphene strip grating. Dual-band perfect absorption is achieved with the change of strip width or chemical potential of the bi-layer graphene strip grating. It is found that the spectral position of the absorption peak can be tuned by the chemical potential or the width of the graphene strip, and additionally by the size of the proposed absorber. Moreover, the proposed perfect absorber shows excellent absorption stability for a wide range of the incident angle up to ±65°. The proposed absorber may find potential application in tunable double band perfect absorbers in the mid-infrared range.

Effects of Dielectric Spacer on Absorbance Characteristics of a Dual-Band Nanoaperture Based Perfect Absorber

2018 ◽  
Vol 915 ◽  
pp. 28-33
Author(s):  
Aytac Onur ◽  
Mustafa Turkmen
Keyword(s):  
Resonance Frequency ◽  
Gold Film ◽  
Spectral Response ◽  
Near Field ◽  
Field Enhancement ◽  
Dual Band ◽  
Plasmon Coupling ◽  
Perfect Absorber ◽  
Sensing Applications ◽  
Dielectric Spacer

In this study, a novel perfect absorber (PA) array based on H-shaped nanoapertures for bio-sensing applications in infrared regime is presented. Proposed PA array has a dual-band spectral response, and the locations of these resonances can be adjusted by varying the geometrical dimensions and layer thicknesses of the structure. Nearly unity absorbance is obtained from the PA array for both resonances. The structure design is based on the near field plasmon coupling between the gold film layer and the top nanoaperture array. In this context, the dielectric spacer layer is used to support this plasmon coupling and the gold film on the silicon substrate is also utilized to eliminate the transmittance through the structure. Different dielectric spacers (MgF2, SiO2, and Al2O3) are used to investigate the effects of dielectric spacer on the absorbance characteristics of proposed PA array. High field enhancement is achieved by the interaction of the sharp corners of nanoapertures. The near field enhancements are more than 1500 times at the first resonance frequency, more than 1000 times at the second resonance frequency which is highly desirable for the infrared bio-sensing applications. Due to the high near-field enhancement and nearly unity absorbance, the proposed dual-band PA array with adjustable spectral responses can be useful for bio-sensing applications in infrared regime.

Design and experimental characterization of an electromagnetic transducer for large-scale vibratory energy harvesting applications

2011 ◽  
Vol 22 (17) ◽  
pp. 2009-2024 ◽  
Author(s):  
Ian L. Cassidy ◽  
Jeffrey T. Scruggs ◽  
Sam Behrens ◽  
Henri P. Gavin
Keyword(s):  
Energy Harvesting ◽  
Large Scale ◽  
Impedance Matching ◽  
Operating Conditions ◽  
Matching Theory ◽  
Experimental Investigations ◽  
Experimental Characterization ◽  
Electromagnetic Transducer ◽  
Wide Range

This article reports on the design and experimental characterization of an electromagnetic transducer for energy harvesting from large structures (e.g., multistory buildings and bridges), for which the power levels can be above 100 W and disturbance frequencies below 1 Hz. The transducer consists of a back-driven ballscrew coupled to a permanent-magnet synchronous machine with power harvesting regulated via control of a four-quadrant power electronic drive. Design considerations between various subsystems are illustrated and recommendations in terms of minimal values are made for each design metric. Developing control algorithms to take full advantage of the unique features of this type of transducer requires a mechanical model that can adequately characterize the device’s intrinsic nonlinear behavior. A new model is proposed that can effectively capture this behavior. Comparison with experimental results verifies that the model is accurate over a wide range of operating conditions. As such, the model can be used to assess the viability of the technology and to correctly design controllers to maximize power generation. To demonstrate the device’s energy harvesting capability, impedance matching theory is used to optimize the power generated from a base-excited tuned mass damper. Both theoretical and experimental investigations are compared and the results are shown to match closely.

A Three-Dimensional Tetraphenylethylene-Based Fluorescence Covalent Organic Framework for Molecular Recognition

2020 ◽  
Author(s):  
Junxia Ren ◽  
Yaozu Liu ◽  
Xin Zhu ◽  
Yangyang Pan ◽  
Yujie Wang ◽  
...  
Keyword(s):  
Molecular Recognition ◽  
Fluorescence Probe ◽  
Three Dimensional ◽  
Hazardous Substances ◽  
Covalent Organic Framework ◽  
Highly Sensitive ◽  
Volatile Organic ◽  
Polycyclic Aromatic ◽  
Better Than ◽  
Organic Framework

<p><a></a><a></a><a></a><a></a><a></a><a></a><a></a><a>The development of highly-sensitive recognition of </a><a></a><a></a><a></a><a></a><a>hazardous </a>chemicals, such as volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs), is of significant importance because of their widespread social concerns related to environment and human health. Here, we report a three-dimensional (3D) covalent organic framework (COF, termed JUC-555) bearing tetraphenylethylene (TPE) side chains as an aggregation-induced emission (AIE) fluorescence probe for sensitive molecular recognition.<a></a><a> </a>Due to the rotational restriction of TPE rotors in highly interpenetrated framework after inclusion of dimethylformamide (DMF), JUC-555 shows impressive AIE-based strong fluorescence. Meanwhile, owing to the large pore size (11.4 Å) and suitable intermolecular distance of aligned TPE (7.2 Å) in JUC-555, the obtained material demonstrates an excellent performance in the molecular recognition of hazardous chemicals, e.g., nitroaromatic explosives, PAHs, and even thiophene compounds, via a fluorescent quenching mechanism. The quenching constant (<i>K</i><sub>SV</sub>) is two orders of magnitude better than those of other fluorescence-based porous materials reported to date. This research thus opens 3D functionalized COFs as a promising identification tool for environmentally hazardous substances.</p>

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