scholarly journals Investigation of dual-bend serpentine/spiral waveguides coupled to a microchannel system for competent, evanescent-wave-absorption-based, on-chip, biological-/chemical-sensing applications

RSC Advances ◽  
2018 ◽  
Vol 8 (62) ◽  
pp. 35539-35550
Author(s):  
Amit Prabhakar ◽  
Neha Mishra ◽  
Deepti Verma ◽  
Soumyo Mukherji
Keyword(s):  
Evanescent Wave ◽  
Chemical Sensing ◽  
High Sensitivity ◽  
Biological Sensing ◽  
Wave Absorption ◽  
Sensing Applications ◽  
Sensing Platform ◽  
Bend Waveguide ◽  
On Chip

The reported device is a versatile sensing-platform, with high sensitivity, for any chemical/biological-sensing applications, if suitable surface adaptation is first performed to the microchannel-system-embedded duel-bend waveguide-probe.

scholarly journals Comparative Analysis of Highly Sensitive PCF for Chemical Sensing in THz Regime

2020 ◽  
Vol 12 (4) ◽  
pp. 94
Author(s):  
Mohammad Saiful Islam ◽  
Anwar Sadath ◽  
Md. Rakibul Islam ◽  
Mohammad Faisal
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensing ◽  
High Sensitivity ◽  
Confinement Loss ◽  
Core Diameter ◽  
Frequency Spectra ◽  
Crystal Fiber ◽  
Sensing Applications ◽  
Design Structure

Nowadays photonic crystal fiber (PCF) is used for sensing purposes in different fields. In this work, we have proposed a PCF based chemical (Benzene and Ethanol) sensor. Finite Element Method (FEM) based software COMSOL 5.3a is used to investigate the numerical characteristics for the proposed structure. From the numerical analysis, we obtained high sensitivity with low losses for an optimum core diameter of 210 µm. Our proposed PCF works on a broad range of core diameters and THz frequency spectra. The fabrication of this model is very simple due to its simplistic design structure. Full Text: PDF ReferencesMd.F.H. Arif, Md.J.H. Biddut, "A new structure of photonic crystal fiber with high sensitivity, high nonlinearity, high birefringence and low confinement loss for liquid analyte sensing applications", Sensing Bio-Sensing Res. 12, 8 (2017). CrossRef P. Kumar, Md.H. Bikash, K. Ahmed, S. Sen, "A Novel Hexahedron Photonic Crystal Fiber in Terahertz Propagation: Design and Analysis", Photonics 6(1), 32 (2019). CrossRef S. Asaduzzaman, K. Ahmed, T. Bhuiyan, T. Farah, "Hybrid photonic crystal fiber in chemical sensing", SpringerPlus 5, 748 (2016). CrossRef Md.S. Islam, J. Sultana, J. Atai, D. Abbott, S. Rana, M.R. Islam, "Ultra low-loss hybrid core porous fiber for broadband applications", App. Opt. 56(4), 1232 (2017). CrossRef S. Atakaramians, S. Afshar, H. Ebendorff-Heidepriem, M. Nagel, B.M. Fischer, D. Abbott, T.M. Monro, "THz porous fibers: design, fabrication and experimental characterization", Opt. Expr. 17(16), 14053 (2009). CrossRef

scholarly journals Epitaxial Graphene Sensors Combined with 3D Printed Microfluidic Chip for Heavy Metals Detection

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 982 ◽  
Author(s):  
Maria Francesca Santangelo ◽  
Ivan Shtepliuk ◽  
Donatella Puglisi ◽  
Daniel Filippini ◽  
Rositsa Yakimova ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Microfluidic Chip ◽  
Chemical Interaction ◽  
High Sensitivity ◽  
Epitaxial Graphene ◽  
Phase Detection ◽  
Lab On Chip ◽  
Sensing Platform ◽  
3D Printed ◽  
On Chip

Two-dimensional materials may constitute key elements in the development of a sensing platform where extremely high sensitivity is required, since even minimal chemical interaction can generate appreciable changes in the electronic state of the material. In this work, we investigate the sensing performance of epitaxial graphene on Si-face 4H-SiC (EG/SiC) for liquid-phase detection of heavy metals (e.g., Pb). The integration of preparatory steps needed for sample conditioning is included in the sensing platform, exploiting fast prototyping using a 3D printer, which allows direct fabrication of a microfluidic chip incorporating all the features required to connect and execute the Lab-on-chip (LOC) functions. It is demonstrated that interaction of Pb2+ ions in water-based solutions with the EG enhances its conductivity exhibiting a Langmuir correlation between signal and Pb2+ concentration. Several concentrations of Pb2+ solutions ranging from 125 nM to 500 µM were analyzed showing good stability and reproducibility over time.

IN-LINE OPTICAL FIBER STRUCTURES FOR ENVIRONMENTAL SENSING

2008 ◽  
Vol 18 (01) ◽  
pp. 167-177 ◽  
Author(s):  
A. DHAWAN ◽  
M. D. GERHOLD ◽  
J. F. MUTH
Keyword(s):  
Optical Fiber ◽  
Surface Plasmon ◽  
Evanescent Wave ◽  
Aqueous Media ◽  
High Sensitivity ◽  
High Specificity ◽  
Planar Waveguides ◽  
Sensing Applications ◽  
Biological Compounds ◽  
Wave Sensors

Surface plasmon and evanescent wave sensors are attractive for chemical and biological sensing applications. They can work in aqueous media and when used in conjunction with the appropriate surface chemistry they can have high specificity and high sensitivity. However, most surface plasmon sensors are relatively complex as they are based on the use of attenuated total internal reflection to excite surface plasmon resonance in a thin gold film and require light to be incident at the appropriate angle and polarization. Other surface plasmon and optical affinity sensors have used the evanescent waves in planar waveguides to interact with the environment. These devices are sensitive but, have strict optical coupling requirements and are difficult to fabricate. In optical fiber evanescent wave sensors the interaction with the surrounding environment is usually obtained by tapering an optical fiber, which significantly weakens the structure, or by just utilizing the end of the optical fiber. In this paper, in-line optical fiber structures are presented that are mechanically robust, and provide a large interaction length for high sensitivity. They are compatible with standard chemistries for optical affinity sensing of biological compounds.

scholarly journals Tunable Infrared Metamaterial Emitter for Gas Sensing Application

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1442 ◽  
Author(s):  
Ruijia Xu ◽  
Yu-Sheng Lin
Keyword(s):  
High Efficiency ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Ir Radiation ◽  
Optical Efficiency ◽  
Sensing Applications ◽  
On Chip ◽  
Ir Emission

We present an on-chip tunable infrared (IR) metamaterial emitter for gas sensing applications. The proposed emitter exhibits high electrical-thermal-optical efficiency, which can be realized by the integration of microelectromechanical system (MEMS) microheaters and IR metamaterials. According to the blackbody radiation law, high-efficiency IR radiation can be generated by driving a Direct Current (DC) bias voltage on a microheater. The MEMS microheater has a Peano-shaped microstructure, which exhibits great heating uniformity and high energy conversion efficiency. The implantation of a top metamaterial layer can narrow the bandwidth of the radiation spectrum from the microheater to perform wavelength-selective and narrow-band IR emission. A linear relationship between emission wavelengths and deformation ratios provides an effective approach to meet the requirement at different IR wavelengths by tailoring the suitable metamaterial pattern. The maximum radiated power of the proposed IR emitter is 85.0 µW. Furthermore, a tunable emission is achieved at a wavelength around 2.44 µm with a full-width at half-maximum of 0.38 µm, which is suitable for high-sensitivity gas sensing applications. This work provides a strategy for electro-thermal-optical devices to be used as sensors, emitters, and switches in the IR wavelength range.

Chemical Sensing With Resistive Microcantilevers

2002 ◽  
Vol 723 ◽  
Author(s):  
G. Muralidharan ◽  
A. Wig ◽  
L. A. Pinnaduwage ◽  
D. L. Hedden ◽  
P. G. Datskos ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Vapor Phase ◽  
Chemical Sensing ◽  
Thermal Response ◽  
High Sensitivity ◽  
Thermal Fluctuations ◽  
Sensing Applications ◽  
Thermal Measurements ◽  
Adsorbed Mass ◽  
High Level

AbstractMEMS-based microcantilevers have been proposed for a variety of biological and chemical sensing applications. Measuring the magnitude of microcantilever deflection due to adsorption-induced bending, and following the variation in the resonant frequency of the microcantilevers due to the adsorbed mass are two techniques commonly employed for sensing analytes. Apart from possessing a high level of sensitivity to small changes in mass, microcantilevers are also very sensitive to small changes in temperature and hence the flow of heat. One way of achieving high sensitivity in thermal measurements is by using a bimaterial microcantilever and measuring its deflection as a result of thermal fluctuations. Commercially available piezoresistive microcantilevers are an example of bimaterial cantilevers and in this study, we propose the use of such cantilevers for sensing explosives. We show that sensing can be accomplished by following the differences in the thermal response of the cantilevers introduced by the presence of explosives adsorbed from the vapor phase onto the surface of the cantilever. We discuss the issues involved in determining the sensitivity of detection and selectivity of detection.

FinFET for high sensitivity ion and biological sensing applications

2011 ◽  
Vol 88 (8) ◽  
pp. 1864-1866 ◽  
Author(s):  
Sara Rigante ◽  
Livio Lattanzio ◽  
Adrian M. Ionescu
Keyword(s):  
High Sensitivity ◽  
Biological Sensing ◽  
Sensing Applications

Review of Microfluidic Devices for On-Chip Chemical Sensing

2016 ◽  
Vol 136 (6) ◽  
pp. 244-249
Author(s):  
Takahiro Watanabe ◽  
Fumihiro Sassa ◽  
Yoshitaka Yoshizumi ◽  
Hiroaki Suzuki
Keyword(s):  
Chemical Sensing ◽  
Microfluidic Devices ◽  
On Chip
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