IDR @ IIT Bhubaneswar
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Item Vortex Shedding Optical Flowmeter based on Photonic Crystal Fiber(2019) Arumuru V.; Dash J.N.; Dora D.; Jha R.In the present work we propose a PCF (photonic crystal fiber) based Modal interferometer detector for sensing low flow velocity by detecting the frequency of vortices shed from a bluff body. The proposed novel design encapsulates the interferometric arm inside a metal casing to protect the sensor from harsh process fluids. The characterization of the developed probe is conducted under no flow conditions using a piezo actuator to evaluate the sensor response over wide frequency range (0�500 Hz). The developed sensors shows a reasonably flat response in the tested frequency range. Experiments are conducted by employing the developed sensor behind a bluff body of a vortex flowmeter to measure the frequency of the shed vortices and hence, the fluid flow rate. The low flow rate sensitivity of the vortex flowmeter is improved many folds by using the present sensor and the minimum Reynolds number detected is Re = 5000. A linear trend is observed between the frequency of the vortices and the flow velocity which is desirable for fluid flow measurement. The PCF based interferometric sensor with metal encapsulation makes the vortex flowmeter, sensitive at low flow rates, robust and economical to be used in industrial application. � 2019, The Author(s).Item On the propagation characteristics and performance of graphene oxide based fiber optic plasmonic sensor(2019) Nayak J.K.; Jha R.We report a study on the electric field analysis, propagation characteristics (propagation length and penetration depth) and performance analysis of an optical fiber based plasmonic sensor using dielectric overlayers such as Graphene, Graphene Oxide (GO), and Silicon (Si) on silver (Ag). The usage of graphene and GO helps to protect silver from oxidation along with opening a new window for bio sensing. We found that the GO as a dielectric overlayer on Ag exhibit higher electric field intensity and Figure of Merit (FOM) as compared to widely used dielectric like Si and Graphene. � 2018 IOP Publishing Ltd.Item Non-graphene two-dimensional nanosheets for temperature sensing based on microfiber interferometric platform: Performance analysis(2019) Sharma G.; Shrivastav A.M.; Kumar A.; Jha R.Materials belongs to the family of two-dimensional materials have attracted great scientific attention inspired by the success of graphene. Now, the scientists have been discovered new monolayer materials by combining a variety of elements, such as molybdenum with sulfur and boron with nitrogen. Owing the unique properties, with ultrathin thickness, devices based on these materials exhibit novel behavior. Here we have synthesized these materials via various chemical routes and their structural, optical and morphological characterizations have been studied. Additionally, the temperature sensitive response of these materials is done by coating of these 2D materials (MoS 2 , Graphene Oxide, hBN) via dip coating method on the microfiber probe fabricated by flame and brush technique. These probes are characterized by wavelength interrogation method within in temperature range of 40�160 �C. The MoS 2 coated sensing probe shows temperature sensitivity as high as 527 pm/�C. Depending upon the applications the performance of the devices can be tailored and can be used for high temperature applications. The sensing probes possess the advantages of low cost, easy fabrication process, laymen application, high temperature applicability, immunity of EM interference. � 2019 Elsevier B.V.Item Hypersensitive and selective biosensing based on microfiber interferometry and molecular imprinted nanoparticles(2019) Shrivastav A.M.; Sharma G.; Jha R.The molecular imprinting techniques with interferometric platform are promising for next-generation optical sensors for online and remote biosensing and device applications. This technique has shown a tremendous potential to provide a highly specific detection of target analyte/molecule with artificial complementary scaffolds in the polymeric nanostructures relay with tunable aspect ratio, low cost synthesis procedure and applicability in harsh environment. To date, no molecular imprinted nanoparticles has been integrated with optical microwire platform in the literature. Here, we report the synthesis of a molecularly imprinted nanocarrier using hydrothermal process that act as receptors and combines optical microwire as transducing support. The detailed sensing process for one of the widely used pesticides (parathion methyl) in the detection range of 10?12 to 10?4 M with hyper-sensitivity and detection limit of 1.30 � 1012 nm/M and 79.43 fM respectively have been achieved. The compact sensing probe tested with real water samples collected from various sources show percentage recovery of around 100%. We strongly believe that the process for probe development will open a new gateway for next generation selective biosensing for biomedical research applications. � 2019 Elsevier B.V.Item Microfiber attached polymer diaphragm as a versatile microphone(2018) Dass S.; Jha R.An optical microphone consisting of a microfiber attached to a polymer diaphragm is presented. The measured acoustic sensitivity of the microphone is 856.2 mV/kPa and its working range is up to 2500 Hz. The sensitivity and working range of this microphone setup can be tailored easily as per the requirement. � 2018 OSA - The Optical Society. All rights reserved.Item Black Phosphorus: A New Platform for Gaseous Sensing Based on Surface Plasmon Resonance(2018) Srivastava T.; Jha R.We numerically demonstrate and propose sensitivity enhancement of surface plasmon resonance (SPR)-based conventional gaseous sensor using few layers of black phosphorous (BP), as compared with other 2D material such as graphene and molybdenum disulphide (MoS2). Results of our optimized numerical study show that with implementation of bilayer BP over a conventional gaseous sensor, sensitivity enhances by 35%, which is further increased up to 73% by addition of a monolayer MoS2 at an operating wavelength \lambda =633 nm. Therefore, the proposed SPR gaseous sensor could potentially open a new platform for high-performance gaseous sensing in the visible region. � 1989-2012 IEEE.Item AZO coated microchannel incorporated PCF-based SPR sensor: A numerical analysis(2018) Dash J.N.; Das R.; Jha R.An aluminum-doped zinc oxide (AZO) coated photonic crystal fiber (PCF) is proposed and numerically analyzed for surface plasmon resonance-based refractive index (RI) sensing. A microchannel is incorporated in this PCF, which is proposed to be fabricated using a pulsed laser. Such a structure is expected to have less roughness compared to that fabricated by mechanical polishing. Furthermore, properties such as no island formation and absence of intraband transition are added advantages of AZO. Numerical simulation shows that the maximum wavelength sensitivity and the corresponding resolution of this sensor are 5000 nm/RIU and 2 � 10-5 RIU, respectively. Furthermore, the amplitude sensitivity is found to be as high as 167 RIU-1. The proposed structure can be easily fabricated and utilized for sensing applications as it does not require either coating of metals on the inner surface of holes of PCF nor filling of the voids of PCF and it requires a small amount of analyte for RI monitoring. � 1989-2012 IEEE.Item Square Knot Resonator-Based Compact Bending Sensor(2018) Dass S.; Jha R.In this letter, design and development of a square knot resonator (SKR) for sensing applications is proposed. The SKR is developed by carefully weaving a single-ended microfiber in and out of a double-ended microfiber. The dependence of the SKR's resonance wavelength on the circular path length and the effective index of microfiber is utilized to sense the bending. Two 4.5-cm-long and 16- ?m-diameter tapered microfibers are used to construct an SKR having a diameter of 885 ?m which has a free spectral range of 0.505 nm, and the Q-factor is more than 14 500. Experimental results show that the bending sensitivity of the SKR is 3.04 nm/m-1 with a maximum theoretical resolution of 3.29 � 10-3 m-1. The temperature sensitivity of the SKR is 3.2 pm/�C. � 2018 IEEE.Item Fabrication and Theoretical Analysis of Square Knot Resonator for Sensing Applications(2018) Dass S.; Jha R.We demonstrate a new type of resonator called square knot resonator. The fabrication of this resonator is economical and it has a Q-factor of 12600. The demonstrated knot resonator can be potentially used for sensing strain, refractive index and curvature. � 2017 IEEE.Item Graphene-Oxide Coated Ag-Island-Based Inline LSPR Fiber Sensor(2018) Nayak J.K.; Jha R.Graphene Oxide (GO) coated silver (Ag) island system based on localized surface plasmon resonance (LSPR) phenomenon have been developed using optical fiber as a sensing probe. The Ag-island is used to excite LSPR field which is responsible for the analyte sensing through a shift in resonance wavelength. The deposition of Ag-islands is confirmed from UV-VIS spectra and Field Emission Scanning Electron Micro-graph (FESEM). The usage of GO helps to protect Ag-island from oxidation along with opening a new window for bio-sensing due to its structural compatibility with the bio-sensing system. We have experientially observed that the GO as a dielectric overlayer on Ag-island shows a refractive index sensitivity of 2217.04 nm/RIU with a resolution of 4.05 � 10-4 RIU. � 2018 IEEE.