Browsing by Author "Kumar, R.R."

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    Experimental investigation and comparative analysis of electron beam evaporated ZnO/MgxZn1-xO/CdxZn1-xO thin films for photodiode applications
    (Academic Press, 2021) Kumar, R.R.; Shukla, R.; Pandey, S.K.; Pandey, S.K.
    — This work reports the growth optimization and analysis of ZnO, MgxZn1-xO, and CdxZn1-xO thin films on silicon substrate using an electron beam evaporation system. The crystal phase purity, surface morphology, optical and electrical properties of deposited ZnO, MgxZn1-xO, and CdxZn1-xO thin films were studied. X-ray diffraction (XRD) spectra revealed that the deposited films were polycrystalline in nature with preferred (002) crystal orientation. Field emission scanning electron microscope study showed a dense-packed grained structure with an exact symmetrical distribution. The root-mean-square roughness of 3.03 nm was perceived by atomic force microscopy measurement for MgxZn1-xO thin-film, indicating good morphology of the deposited film. Photoluminescence measurement demonstrated a near-band-edge emission peak around 363 nm for ZnO thin film. The energy band gap obtained for ZnO, MgxZn1-xO, and CdxZn1-xO were 3.36 eV, 3.86 eV, and 2.89 eV, respectively, as measured by Ultraviolet–Visible spectroscopy. The higher amount of photocurrent was detected in illumination condition compared to dark condition with responsivity 0.54 AW-1 for ZnO films, making it suitable for photodiodes applications. © 2020 Elsevier Ltd
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    Photonic crystal ring resonator: A promising device for a multitude applications
    (2017) Yadunath, T.R.; Kumar, R.R.; Sreenivasulu, T.; Kandoth, A.; John, K.; Ramakrishnan, R.K.; Das, P.P.; Badrinarayana, T.; Mohan, S.; Hegde, G.; Srinivas, T.
    In this paper a 2D Photonic Crystal array in SOI platform having hexagonal periodicity with a ring defect incorporated along with two bus waveguides is conceptualized and realized for various applications of optical communication, sensing etc. The ring structure filters out a resonant wavelength from the spectrum carried to it through the line defect where the resonated peak is determined by the effective ring radius. The hexagonal architecture enables more coupling length than an ideal ring structure which helps in better intensity accumulation. The resonant peak exhibited at 1554nm in simulation, which is observed in the optical characterization at 1543nm. This is attributed to the fabrication tolerance. � 2017 SPIE.
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    Photonic crystal ring resonator: A promising device for a multitude applications
    (SPIE spie@spie.org, 2017) Yadunath, T.R.; Kumar, R.R.; Tupakula, T.; Kandoth, A.; John, K.; Ramakrishnan, R.K.; Das, P.P.; Badrinarayana, T.; Mohan, S.; Hegde, G.M.; Srinivas, T.
    In this paper a 2D Photonic Crystal array in SOI platform having hexagonal periodicity with a ring defect incorporated along with two bus waveguides is conceptualized and realized for various applications of optical communication, sensing etc. The ring structure filters out a resonant wavelength from the spectrum carried to it through the line defect where the resonated peak is determined by the effective ring radius. The hexagonal architecture enables more coupling length than an ideal ring structure which helps in better intensity accumulation. The resonant peak exhibited at 1554nm in simulation, which is observed in the optical characterization at 1543nm. This is attributed to the fabrication tolerance. © 2017 SPIE.
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    Virtual Prototyping with Rigid Body Concept for the Development of Internal Combustion Engine
    (2017) Kumar, R.R.; Krishna, P.; Kuppast, V.V.
    The recent surge in the demand for the virtual application has led to the need for prototype testing that control the associated problem to a great extent. Consequently, a reduction in the costs of operating the actual prototype is envisaged. However, in some cases, just by adjusting input parameters alone could increase the success rate of these prototypes. During the design process, the functional prototyping is mainly used to evaluate the appearance of product and simulate its system level functioning. Multi-body dynamics analysis involves the simulation of rigid body systems under the application of forces or motions. Virtual prototype can substitute the physical prototype to perform a system level functioning of the product. The Internal combustion engine mechanism is considered for simulating the system level working with real time dynamic responses. Virtual prototype is created with a rigid body concept for an existing four stroke, single cylinder internal combustion engine mechanism to visualize the system level functioning and to find the displacement, velocity and acceleration of the piston on account of validation of the actual functioning of the engine. Virtual engine created by modeling individual parts of the product using CAD software and is simulated by using Hyper-Works computer aided engineering (CAE) tool. Finally, the validation of the functioning of the engine is done by comparing the results obtained by mechanism response (slider-crank mechanism; idealized for an internal combustion engine) of the engine using real time operating data collected experimentally. � 2017 SAE International.
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    Virtual Prototyping with Rigid Body Concept for the Development of Internal Combustion Engine
    (SAE International, 2017) Kumar, R.R.; Krishna, P.; Kuppast, V.V.
    The recent surge in the demand for the virtual application has led to the need for prototype testing that control the associated problem to a great extent. Consequently, a reduction in the costs of operating the actual prototype is envisaged. However, in some cases, just by adjusting input parameters alone could increase the success rate of these prototypes. During the design process, the functional prototyping is mainly used to evaluate the appearance of product and simulate its system level functioning. Multi-body dynamics analysis involves the simulation of rigid body systems under the application of forces or motions. Virtual prototype can substitute the physical prototype to perform a system level functioning of the product. The Internal combustion engine mechanism is considered for simulating the system level working with real time dynamic responses. Virtual prototype is created with a rigid body concept for an existing four stroke, single cylinder internal combustion engine mechanism to visualize the system level functioning and to find the displacement, velocity and acceleration of the piston on account of validation of the actual functioning of the engine. Virtual engine created by modeling individual parts of the product using CAD software and is simulated by using Hyper-Works computer aided engineering (CAE) tool. Finally, the validation of the functioning of the engine is done by comparing the results obtained by mechanism response (slider-crank mechanism; idealized for an internal combustion engine) of the engine using real time operating data collected experimentally. © 2017 SAE International.