IDR @ IIT Bhubaneswar
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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 Graphene Oxide Coated PCF Interferometer for Enhanced Strain Sensitivity(2017) Dash J.N.; Negi N.; Jha R.We propose a graphene oxide (GO) coated photonic crystal fiber (PCF) based modal interferometer for strain and temperature sensing. This Mach-Zehnder interferometer based probe has been fabricated by splicing PCF with single mode fiber (SMF) and creating a short collapsed region at one of the SMF-PCF junction and a long collapsed region at the other splicing junction. The PCF along with the collapsed regions is coated with GO prepared by Hummers method. The short collapsed region has been used to excite core and cladding modes in PCF while the long collapsed region is used for better interaction of core and cladding modes with GO. The change in refractive index of GO has been utilized to monitor strain. The uncoated probe shows a strain sensitivity of 1.6 pm/?? while the GO coated probe shows a strain sensitivity of 3.1 pm/??, thereby enhancing the strain sensitivity by 93%. Further, the probe shows a temperature sensitivity of 14 pm/�C. � 1983-2012 IEEE.Item Highly sensitive D shaped PCF sensor based on SPR for near IR(2016) Dash J.N.; Jha R.A highly sensitive D shaped photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor has been proposed. The use of Indium Tin Oxide as plasmonic metal helps in achieving SPR in near infrared region. The geometrical parameters of the proposed structure are similar to that of commercially available PCF which is widely available. Simulation results show that the proposed structure has a high wavelength sensitivity of 5200�nm/RIU with resolution of 1.92�נ10?5�RIU. � 2016, Springer Science+Business Media New York.Item Fabry-perot cavity on demand for hysteresis free interferometric sensors(2016) Dash J.N.; Jha R.We propose a dual air cavity based Fabry-Perot interferometer for the sensing of physical parameters such as strain and curvature. This highly stable and compact structure can be fabricated by splicing SMF with hollow core photonic crystal fiber (HCPCF) with optimized splicing parameters. The proposed structure showed negligibly small hysteresis along with long range of operation. The interference pattern can easily be controlled by controlling the geometry of the cavities according to the requirement. Experimental results show that the proposed structure has a strain and curvature sensitivity of 4.08 pm/? 2.23 nm/m-1. The temperature sensitivity varies from 0.5 to 9 pm/�C. Moreover, the solid silica region in the probe can be utilized to study the effect of refractive index of surrounding medium. � 1983-2012 IEEE.Item Mach-Zehnder interferometer based on tapered PCF with an up-tapered joint for curvature, strain and temperature interrogation(2016) Dash J.N.; Jha R.We propose a Mach-Zehnder interferometric sensor based on tapered Photonic Crystal Fiber (PCF) with up-tapered collapsed region for measurement of parameters such as curvature, strain and temperature. The up-tapered collapsed region helps in excitation of the cladding modes in PCF and these modes interfere with each other at the tapered region of PCF which is completely collapsed. Three tapered PCFs with varying geometry are fabricated and their effect on curvature sensitivity is analyzed. Experimental results show that the proposed sensor has a curvature sensitivity of 7.56 nm m-1 with negligible hysteresis effect. Moreover, the proposed sensor shows a strain sensitivity of 1.6 pm/?? along with a maximum temperature sensitivity of 51.6 pm �C-1. In addition to this, the response of the interference pattern to all these parameters is found to be linear. � 2016 IOP Publishing Ltd.Item Inline microcavity-based PCF interferometer for refractive index and temperature sensing(2015) Dash J.N.; Jha R.We report an inline Fabry-Perot interferometer based on photonic crystal fiber (PCF) with microcavity as refractive index and temperature sensor. The interferometer consists of a section of large mode area PCF spliced with single mode fibers on one side, whereas a microcavity is fabricated on the other side of PCF. The formation of the microcavity reduces the period of the interference pattern thereby providing distinctiveness to the measurement. Experimental results show that this simple, compact, and highly stable inline interferometer has temperature sensitivity of 12 pm/�C and a refractive index sensitivity of ? 30 nm/RIU along with a resolution of 3 � 10-4 RIU-1. � 2015 IEEE.Item PCF Modal Interferometer Based on Macrobending for Refractive Index Sensing(2015) Dash J.N.; Jha R.We experimentally demonstrated a photonic crystal fiber (PCF)-based modal interferometer with macrobending for the detection of analyte refractive index (RI). The interferometer consists of a section of large mode area PCF spliced between single mode fibers (SMFs), i.e., SMF-PCF-SMF structure. The PCF is subjected to macrobending of the order of cm ^{-1} and its modal properties for different values of macrobending radii have been analyzed using finite-element method. Experimental results show that this simple and compact interferometer has low temperature and power dependence but its RI sensitivity is found to be as high as 258 nm/RIU for a curvature of 0.36 cm (which is 165% higher than zero curvature) with a resolution 3.9 � 10 RIU. � 2001-2012 IEEE.Item SPR biosensor based on polymer PCF coated with conducting metal oxide(2014) Dash J.N.; Jha R.We propose a biosensor based on photonic crystal fiber made of polymethyl methacrylate using surface plasmon resonance. The proposed sensor consists of a layer of air holes as cladding and a central hole for phase matching between plasmon mode and core guided mode. Alternate holes in the second layer coated with conducting metal oxide, i.e., indium tin oxide (ITO), contain analyte. We found that the optimized thickness of the ITO for optimum performance is 70 nm, which matches with reported result. Unlike other metal coated structures, here the resonance is around telecommunication window and can be tuned by varying the intrinsic properties of the ITO as per requirement. The proposed sensor shows refractive index sensitivity as high as 2000 nm/RIU and has resolution of 5 � 10-5 RIU. � 1989-2012 IEEE.