Rajesh Kumar P C

@sjec.ac.in

Associate Professor and Head
St Joseph Engineering College Mangaluru



              

https://researchid.co/pcrajeshkumar

EDUCATION

MSc, MIT, PhD

RESEARCH INTERESTS

Nonlinear Optical Materials, Z-Scan, Thin films, Crystal Growth

17

Scopus Publications

Scopus Publications

  • Comprehensive Analysis on the Z-Scan Response of Thermally Evaporated CuTPP Thin Films in Terms of H Aggregation and Charge Transfer Dynamics
    L. M. Clavian, P. C. Rajesh Kumar, K. V. Anil Kumar, D. Narayana Rao, N. K. Shihab, and Ganesh Sanjeev
    American Chemical Society (ACS)


  • Effectiveness of collaborative learning among gen z engineering students
    Sandhya Dass, Ramananda H. S., Jagadeesha B., Rajesh Kumar P. C., and Reni K. K Cherian
    Rajarambapu Institute of Technology

  • Enhanhanced third order optical nonlinearity in ultrathin amorphous film of tetraphenyl-porphyrin in picosecond regime
    L.M. Clavian, P.C. Rajesh Kumar, K.V. Anil Kumar, D. Narayana Rao, N.K. Shihab, and Sanjeev Ganesh
    Elsevier BV

  • Third order optical nonlinearity in TPP incorporated PMMA composite thin film
    L. M. Clavian, P. C. Rajesh Kumar, K. V. Anil Kumar, D. Narayana Rao, N. K. Shihab, and Ganesh Sanjeev
    AIP Publishing

  • Intensity dependent third order optical nonlinearity of zinc-tetraphenyl porphyrin ultrathin film in nano-second regime
    P. C. Rajesh Kumar, L. M. Clavian, K. V. Anil Kumar, D. Narayana Rao, N. K. Shihab, and Ganesh Sanjeev
    AIP Publishing
    The third order nonlinear optical properties of 5,10,15,20 Tetraphenyl 21H,23H-porphine zinc (II) (ZnTPP) thin films have been investigated by using single beam Z-scan technique with 6 ns laser pulse operating at 532 nm. The ultrathin films of ZnTPP with the thickness of the order of 120 nm were fabricated by means thermal vacuum coating technique. The UV-Visible spectrum depicts signature absorption curve identifying the enhancement in the symmetry of the molecule from D2h symmetry to D4h, due to the presence of central Zn metal ion. The ZnTPP thin film is exhibiting reverse saturation absorption (RSA) and strong self-defocusing effect. The effective two photon nonlinear absorption coefficients (βeff) and nonlinear refractive index (n2) obtained at different input on-axis peak intensities (I0) are of the order of 10−6 to 10−5 m/W and 10−13 to 10−11 m2/W. The decrease in βeff with the increase in intensity indicates that the observed RSA is due to the excited state absorption (ESA) from T1 triplet state t...

  • Study of Non Linear Optical Properties of a Chalcone Doped PVA Composite Material
    P.C. Rajesh Kumar, K. Janardhana, K.M. Balakrishna, and T. Sheela
    Elsevier BV

  • Crystal growth and third order NLO properties of a photonic material
    P.C. Rajesh Kumar, K. Janardhana, and Vincent Crasta
    Elsevier BV

  • Investigation of third-order nonlinear optical properties of pyrazoline-doped polyvinyl alcohol films
    K. Janardhana, V. Ravindrachary, P.C. Rajesh Kumar, and Ismayil
    Wiley
    A 2-pyrazoline,3-(phenyl)-5-(4-N,N-dimethylaminophenyl)- 1H-2-pyrazoline (PDAP) was synthesized and characterized by Fourier transform infrared, nuclear magnetic resonance, ultraviolet (UV)–visible, and Z-scan techniques. The PDAP-doped polyvinyl alcohol composite films were prepared by solvent casting method using dimethylformamide as solvent. The optical properties of the composites were studied using UV–visible, steady state fluorescence, single beam Z-scan technique and degenerate four wave mixing (DFWM) technique. The optical constants such as band gap and optical activation energy were evaluated. The steady state fluorescence data showed both emission peak wavelengths and intensity change with PDAP-doping level in the composites. The open aperture Z-scan of the composite films displayed reverse saturable absorption. A self-focusing effect was observed under closed aperture configuration and the nonlinear refractive index of the film was observed increasing with the increase of doping. The third-order nonlinear susceptibility was compared with that obtained with picoseconds pulses through DFWM technique. The thermogravimetry analysis shows that the composites are thermally stable up to 2608C. POLYM. ENG. SCI., 53:1958–1967, 2013. a2013 Society of Plastics Engineers

  • Third order nonlinear optical studies of 1-(4-chloro phenyl)-3-(4- dimethylamino phenyl) prop-2-en-1-one
    K. Janardhana, V. Ravindrachary, P.C. Rajesh Kumar, Yogisha, and Ismayil
    Elsevier BV

  • Nonlinear optical studies of a novel pyrazoline
    K. Janardhana, V. Ravindrachary, P.C. Rajesh Kumar, G. Umesh, K. B. Manjunatha, and Ismayil
    AIP
    A novel pyrazoline, 3-(phenyl)-5-(4-hydroxyphenyl)-1-(2, 4-dinitrophenyl)-2-pyrazoline (PHDP) was synthesized using standard method and its chemical structure was confirmed using FTIR studies. The linear and non linear optical properties of the compound were studied using UV-Vis and Z-scan techniques. UV-Vis spectrum shows that the compound is transparent in the visible region and absorption in the UV region. The z-scan study shows that the compound possesses third and higher order optical nonlinearity. The calculated optical absorption cross sections indicate that the operating nonlinear mechanism is reverse saturable absorption type. The real part of the third-order nonlinear optical susceptibility χ3 was estimated and the closed aperture data shows that PHDP possess negative nonlinearity.

  • Structural and optical properties of a new chalcone single crystal
    P.C. Rajesh Kumar, V. Ravindrachary, K. Janardhana, and Boja Poojary
    Elsevier BV

  • Optical and structural properties of chalcone NLO single crystals
    P.C. Rajesh Kumar, V. Ravindrachary, K. Janardhana, H.R. Manjunath, Prakash Karegouda, Vincent Crasta, and M.A. Sridhar
    Elsevier BV

  • Synthesis and characterization of organic NLO compound
    P. C. Rajesh Kumar, V. Ravindrachary, K Janardhana, H. R. Manjunath, Prakash Karegoudar, Alka B. Garg, R. Mittal, and R. Mukhopadhyay
    AIP
    Organic compound 1‐(2 thiophene)‐3‐(2, 3, 5‐trichloroph enyl)‐2‐propen‐1‐one [TTCP] with molecular formula C13H7Cl3OS was synthesized using condensation reaction method. FT‐IR spectra were recorded to identify the various functional groups present in the compound. The third harmonic optical nonlinearity test was carried out using z‐scan technique. The single crystals were grown using slow evaporation solution growth technique. Optical absorption studies reveal that the crystal is transparent in the entire visible region and absorption (around 364 nm) takes place in the UV‐region. The single‐crystal XRD studies were carried out, and it was found that the compound crystallizes in the monoclinic system with a space group P21/c. The observed lattice parameters are a = 16.6170(6) A b = 7.6180(5) A c = 10.9280(11) A and V = 1338.47(17) A3.

  • Dielectric studies on swift heavy ions and electron irradiated organic single crystal
    Vincent Crasta, V. Ravindrachary, P. C. Rajesh Kumar, S. Ganesh, Alka B. Garg, R. Mittal, and R. Mukhopadhyay
    AIP
    Single crystals of 1‐(4‐methylphenyl)‐3‐(4,N,N‐dimethylamino phenyl)‐2‐propen‐1‐one were irradiated with 72 MeV swift heavy ions of C‐12 with different fluencies 5×1011, 1×1012 and electrons with energy 8 MeV for a dose of 2.25 kGy. The changes in the dielectric properties of these crystals have been studied. The study shows that the dielectric constant increases first and then decreases with the increase of fluence. This variation has been discussed and possible explanations are given. The variation of dielectric loss and the ac conductivity indicates that there is some structural modification within the crystal due to irradiation. The electron irradiation induced ionic polarizibility within the crystal along the electron path, which is reflected in increase in dielectric constant and hence the conductivity.

  • Third order optical nonlinearity of a pyrazoline derivative
    K. Janardhana, V. Ravindrachary, P. C. Rajesh Kumar, Yogisha, Bhoja Poojary, K. B. Manjunatha, and Ismayil
    American Institute of Physics
    A new pyrazoline derivative 3‐phenyl‐5‐(4‐N,N‐dimethylaminophenyl)‐1H‐2‐pyrazoline (PDHP) was synthesized using standard method. The structure of the compound was established based on 1H NMR spectrum. The third‐order optical nonlinear properties of PDHP compound were measured using nanosecond Z‐scan method The measured nonlinear absorption coefficient β is 0.27×10−10 m W−1. The magnitude of third order susceptibility is Reχ(3) = =19.94×10−13 esu and Imχx(3) = 5.85×10−13 esu. These experimental results reveal that the PDHP may be a good candidate for optical limiting applications due to its reverse saturated absorption phenomenon

  • Growth, characterization, crystal and molecular structure studies of 1-(2 ′-thiophen)-3-(2, 3, 5-trichlorophenyl)-2-propen-1-one
    H.R. Manjunath, P.C. Rajesh Kumar, S. Naveen, V. Ravindrachary, M.A. Sridhar, J. Shashidhara Prasad, and Prakash Karegoudar
    Elsevier BV