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Creation of Super Long Transversely Polarized Optical Needle Using Azimuthally Polarized Multi Gaussian Beam

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Chinese Physics Letters 2016年第6期33卷 29-32页

作者： C.M.Sundaram k.prabakaran P.M.Anbarasan k.B.Rajesh A.M.Musthafa Department of Physics Periyar University Department of Physics Mahendra Arts and Science College(Autonomous) Department of Physics Chikkanna Government Arts College Department of General Studies(Physics Group) Jubail University College(Male Branch)Royal Commission of Jubail

The intensity distribution in the focal region of a high-NA lens for the incident azimuthally polarized multi Gaussian beam transmitted through a multi belt spiral phase hologram is studied on the basis of the vector diffraction theory. Here we report a new method used to generate a needle of transversely polarized light beam with sub diffraction beam size of 0.366A that propagates without divergence over a long distance of about 22A in free space. We also expect that such a light needle of transversely polarized beam may find its applications in utilizing optical materials or instruments responsive to the transversal field only.

关键词： of on it for Creation of Super Long Transversely Polarized Optical Needle Using Azimuthally Polarized Multi Gaussian Beam in that is

Creation of Multiple Subwavelength Focal Spot Segments Using Phase Modulated Radially Polarized Multi Gaussian Beam

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Chinese Physics Letters 2016年第9期33卷 48-51页

作者： k.prabakaran k.B.Rajesh S.Sumathira M.D.Bharathi R.Hemamalini A.M.Musthafa V.Aroulmoji Department of Physics Mahendra Arts and Science College(Autonomous) Department of Physics Chikkanna Government Arts College Department of Physics Sri Sarada College for Women(Autonomous) Department of General Studies(Physics Group) Jubail University College(Male Branch) Royal Commission of Jubail Center for Research and Development Mahendra Educational Institutions

Based on the vector diffraction theory, the effect of complex phase filters on intensity distribution of a radially polarized multi Gaussian beam in the focal region of high NA lens is theoretically investigated. It is observed that a properly designed multi belt complex phase filter can generate subwavelength novel focal patterns including splitting of focal spots and generation of multiple focal spot segments such as eight, six and four focal spots along the optical axis are obtained. We expect that such an investigation is useful for optical manipulation and material processing, multiple high refractive index particle trapping technologies.

关键词： of for Creation of Multiple Subwavelength Focal Spot Segments Using Phase Modulated Radially Polarized Multi Gaussian Beam on is in

Comparison of eigensensitivity and ANN based methods in model updating of an eight-story building

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Earthquake Engineering and Engineering Vibration 2015年第3期14卷 453-464页

作者： prabakaran k Ashok kumar Shashi kant Thakkar Department of Civil Engineering PSG College of Technology Department of Earthquake Engineering IIT Roorkee

Analytical models prepared from field drawings do not generally provide results that match with experimental *** error may be due to uncertainties in the property of materials,size of members and errors in the modelling *** is important to improve analytical models using experimentally obtained *** the past several years,data obtained from ambient vibration testing have been successfully used in many cases to update and match dynamic behaviors of analytical models with real *** paper presents a comparison between artificial neural network(ANN) and eigensensitivity based model updating of an existing multi-story building.A simple spring-mass analytical model,developed from the structural drawings of the building,is considered and the corresponding spring stiffness and lumped mass of all floors are chosen as updating *** advantages and disadvantages of these updating methods are *** advantage is that both methods ensure a physically meaningful model which canbe further employed in determining structural response and health monitoring.

关键词： ambient vibration measurement model updating artif

Congenital esophageal stenosis presenting in an 8-year-old child

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World Journal of Pediatric Surgery 2019年第1期2卷 11-14页

作者： prabakaran Sundararajan Saravanan Natarajan kasthuri Thialagam k Department of Pediatric Surgery Mohan Kumaramangalam Medical CollegeSalemTamil NaduIndia

Congenital esophageal stenosis(CES)is a rare anomaly with an incidence of 1 per 25000-50000 live births.1 Patients with CES often present early in life with dysphagia and poor weight gain due to reduced intake of solid food.A stenosis higher and closer to the respiratory tract also produces respiratory symptoms,while lower lesions produce only abdominal *** the symp-toms start early during the weaning period,we report a case where the diagnosis was made in an 8-year-old child who presented to the outpatient department with dysphagia.

关键词： stenosis esophageal respiratory