D.V.G.L.N. Rao

Physics Professor at U Mass Boston.

Department of Physics
University of Massachusetts Boston
100 Morrissey Blvd.
Boston, MA , 02125 -3393

Office: S-3-76

phone: (617) 287-6065
email: Raod "at" umb.edu

photo

Research | Patents | Publications |

“Motion of Amoeba - the movement of the nucleus, contractile value and smaller organelles that move within cytoplasm are clearly visible”


Researrch Interests:  Experimental Laser Physics: Nonlinear Optics; Medical Image Processing; Nano and Bio Photonics; Optical Data Storage; Optical Power Limiting & Laser Eye Protection.


Education:

  • Andhra University, Waltair, India, B.Sc. (Honors) 1953
  • M.Sc., 1954; D.Sc., 1958

  • Professor Rao's Selected Publications in Journals:

  • Phase contrast imaging using photo-thermally induced phase transitions in liquid crystals, wiht Chandra S. Yelleswarapu, Sri-Rajasekhar Kothapalli, Yvonne Vaillancourt, Francisco J. Aranda, and B. Kimball, Applied Physics Letters (In press).
  • All-optical spatial filtering with power limiting materials, with Chandra S. Yelleswarapu, Pengfei Wu, Sri-Rajasekhar Kothapalli, B. Kimball, S. Sivasankara Sai, R. Gowrishankar, and S. Sivaramakrishnan, Optics Express, 14, 2006.
  • Nonlinear optical image processing with bacteriorhodopsin polymer films, with Chandra S. Yelleswarapu, Pengfei Wu, and Sri-Rajasekhar Kothapalli, Molecular Crystals & Liquid Crystals, 446, 273, 2006. .
  • Controllable snail-paced light in biological bacteriorhodopsin, with Pengfei Wu. Physical Review Letters, 95 253601 (2005). (PDF)
  • Optical switch with sign control using a nonlinear waveguide layer, with Pengfei Wu, Sriram G. Naraharisetty, B. R. Kimball, and Chandra S. Yelleswarapu. Submitted to Applied Physics Letters.
  • Spectral phase based medical image processing, with Sri-Rajasekhar Kothapalli,Chandra S. Yelleswarapu, Sriram G. Naraharisetty, and Pengfei Wu. Academic Radiology, 12, 708, (2005). (pdf)
  • Nonlinear optical Fourier filtering technique for medical image processing, with Sri-Rajasekhar Kothapalli, Pengfei Wu, and Chandra S. Yelleswarapu. Journal of Biomedical Optics, 10, 0440280, (2005). (pdf).
  • Medical image processing using t ransient Fourier holography in Bacteriorhodopsin films, with Sri-Rajasekhar Kothapalli, Pengfei Wu, and Chandra S. Yelleswarapu. Applied Physics Letters, 85, 5836, (2004). (pdf)
  • Light scattering of periodic beta-aligned carbon nanotubes, with Pengfei Wu, B. Kimball. Physics Review Letters (2004). (pdf)
  • Biological nano-ceramic materials for holographic data storage, with Pengfei Wu, Murty Bhamidipati, and Melissa Coles Pages 506-510 Chemical Physics Letters, 400, 506, (2004). (pdf)
  • Self-diffraction in bacteriorhodopsin films for low power optical limiting, with D. Narayana Rao, Chandra S. Yelleswarapu, Sri-Rajasekhar Kothapalli, B. Kimball. Optics Express, 11 , 2848 (2003). (pdf)
  • Optical power limiting with photoinduced anisotropy of azobenzene films, with Pengfei Wu, Reji Phillip, Ramesh B. Laghumavarapu, Janakiram Devulapalli, Brain R. Kimball, Masato Nakashima, and Barry S. DeCristofano. Applied Opics , 42(22) , 4560, (2003). (pdf)
  • Photonic crystals based on periodic arrays of aligned carbon nanotubes, with K. Kempa, B. R. Kimball, J. Rybczynski, Z. P. Huang, P. F. Wu, D. Steeves, M. Sennett, M. Giersig, D. L. Carnahan, D. Z. Wang, J. Y. Lao, W. Z. Li, and Z. F. Ren. Nano Letters , 3(1) , 13-18, (2003). (pdf)
  • Enhancement of photoinduce anisotropy and all-optical switching in Bacteriorhodopsin films, with Pengfei Wu, B. R. Kimball, M. Nakashima and B. S. DeCristofano. Applied Physics Letters , 81 , 3888-3890 (2002). (pdf)
  • Non-volatile grating in an azobenzene polymer with optimized molecular reorientation, with P. Wu, B.R. Kimball, M. Nakashima, B.S. DeCristofano. Applied Physics Letters , 78 , 1189-91 (2001). (pdf)
  • Self-protective diffraction limiting using the technique of bi-photon holography, with P. Wu, B.R. Kimball, M. Nakashima, B.S. DeCristofano. Non-linear Optics , 27 , 287-295 (2001).
  • Processing of medical images using real-time optical fourier processing, with Appaji Panchangam, K.V.L.N. Sastry, B.S. DeCristofano, B.R. Kimball and M. Nakashima. Medical Physics , 28 , 22-27 (2001).
  • Wavelength dependent studies of nonlinear absorption in ZnmpTBP uisng Z-scan technique, with N. Srinivas , B. R. Kimball, M. Nakashima and B. S. DeCristofano. Journal of Porphoyrins and Pthalocyanines , 5 , 549-554 (2001).
  • Spatial light modulator with output sign control and self protective diffraction limiting, with P. Wu, B.R. Kimball, M. Nakashima and B.S. DeCristofano. Journal of Optical Society of America B 17 , 1548-1553 (2000).
  • Spatial light modulation with an azobenzene doped polymer by use of biphotonic holography, with P. Wu, B.R. Kimball, M. Nakashima and B.S. DeCristofano. Optics Letters , 24 , 841-843 (1999). (pdf)
  • Optical implementation of the wavelet tranform using a Bacteriorhodopsin film as an optically addressed spatial light modulator, with Joby Joseph, F.J. Aranda, B.S. DeCristofano, B.R. Kimball and M. Nakashima. Applied Physics Letters , 73 , 1484 (1999).
  • Dispersion of the nonlinear absorption of copper phthalocyanine in a silica xerogel matrix through the visible spectrum, with E. Blanco, D. Narayana Rao, F.J. Aranda, S. Tripathy, J.A. Akkara, R. Litran and M. Ramirez-del-Solar. Journal of Applied Physics , 83(6) , 3441-3443 (1998).
  • A comparative study of C 60 pthalocyanine and porphyrin for optical limiting over the visible region with D.Narayana Rao, E. Blanco F. J. Aranda. Journalof Scientific and Industrial Research ( India ) , 57 , 664 (1998).
  • Dispersion studies of non-linear absorption in C 60 using Z-Scan with D. Narayana Rao, J. A. Akkara and B.S. DeCristofano. Chemical Physics Letters , 297 , 491 (1998).
  • Optical computing and information processing with a protein complex, with Joby Joseph, F.J. Aranda and B.S. DeCristofano. Optical Memory and Neural Networks , 6 , 275 (1997).
  • Ultra fast relaxation times of Metalloporphyrins by time resolved degenerate four wave mixing with incoherent light, with D. Narayana Rao, S. V. Rao, F. J. Aranda, M. Nakashima and J. A. Akkara. Journal of Optical Society of America B 14 , 2710-2715 (1997).
  • All-optical logic gates with Bacteriorhodopsin films, with D. Narayana Rao, F.J.Aranda, Z. Chen, J.A. Akkara, D.L. Kaplan, M. Nakashima. Optics Communication, 127 , 193 (1996). *Photonic applications of Bacteriorhodopsin, with F. J. Aranda, Z. Chen, J. A. Akkara, D. L. Kaplan, M. Nakashima. Journal of Nonlinear Optical Physics and Materials , 5 , 331 (1996).
  • Third order nonlinear optical susceptibility of films of polydiacetylene-containing polyamides and polyesters, with S. Fomine, E. Adam, and T. Ogawa. Polymer Bulletin , 34 , 169 (1995).
  • Nonlinear optical interactions in Bacteriorhodopsin using Z-scan, with F. J. Aranda, C. L. Wong, P. Zhou, Z. Chen, J. A. Akkara, D. L. Kaplan and J. F. Roach. Optical Review , 2 (1995).
  • All-optical light modulation in Bacteriorhodopsin films, with F. J. Aranda, R. Garimella, N. F. McCarthy, D. Narayana Rao, Z. Chen, J. A. Akkara, D. L. Kaplan and J. F. Roach. Applied Physics Letters , 67 , 599(1995).
  • Biomimetic membrane and interface templates for enzyme-based polymerization reactions, with J. A. Akkara, M. Ayyagari, F. Bruno, L. Samuelson, V.T. John, C. Karayigitoglu, S. Tripathy, K.A. Marx and D.L. Kaplan. Biomimetics , 2 , 331 (1994).
  • Third-order nonlinear optical interactions in Tetrabenzporphyrins, with F. J. Aranda, D. E. Remy and F. J. Roach. International Journal of Nonlinear Optical Physics , 3 , 511 (1994).
  • Third-order nonlinear optical interactions of C 60 and C 70 , with F.J. Aranda, J. F. Roach and P. Tayebati. Journal of Applied Physics , 73 , 7949 (1993).
  • Mirrorless all-optical bistability in Bacteriorhodopsin, with F. J. Aranda, B. J. Wiley, J. A. Akkara, D. L. Kaplan and J. F. Roach. Applied Physics Letters , 63 , 1489 (1993).
  • Third-order optical nonlinearities of Benzoporphyrins and a Platinum Poly-yne, with S. Guha, K. Kang, P. Porter, F. J. Aranda, D. E. Remy and J. F. Roach. Optics Letters , 17 , 264 (1992). (pdf)
  • Third-order nonlinear optical interactions of some Benzoporphyrins, with F. J. Aranda, D. E. Remy, and J. F. Roach. Applied Physics Letters , 58 , 1241 (1991).
  • Inverse-scattering transform of stimulated Raman and Brillouin scattering in the quasi-steady state regime, with D. N. Ghosh Roy. Physical Review Letters , 66 , 2308 (1991).
  • Self-focusing in polymers, with James Bickford, A. Sheri and Muthu Kumar. Journal of Polymer Science , Part C , Polymer Letters , 28 , 247 (1990).
  • Optical pulse narrowing by backward transient stimulated Brillouin scattering, with D. N. Ghosh Roy. Journal of Applied Physics , 59 , 332 (1986). *Brillouin scattering in thin film waveguides with S. Janaki, P. Rao, and N. Swamy. Applied Physics Letters , 44 , 1025 (1984).
  • Optical pulse compression in a cholesteric liquid crystal with D. N. Ghosh Roy and Harold Bronk. Applied Physics Letters , 39 , 474 (1981).
  • Pretransitional behavior of self-focusing in nematic liquid crystals, with S. Jayaraman. Physics Review A 10 , 2457 (1974). *Stimulated Raman scattering in a liquid crystal, with D.K. Agraljal. Physics Letters , 37A , 383 (1971).
  • Stimulated Brillouin scattering in a liquid crystal. Physics Letters , 32A , 533 (1970).
  • Brillouin scattering of light in liquid crystal, with G. Durand. Physics Letters , 27A , 455 (1968).
  • Laser induced resistivity changes in Silicon. Journal of Applied Physics , 39 , 4853 (1968).
  • Quadrupole interactions in Chrysoberyl, with L. Rao. Physics Review , 160 , 274 (1967).
  • Calculations of electric field gradients and g-factors for a single crystal of paramagnetic CUC12 2H20, with A.N. Murty. Physics Review , 132 , 961 (1963).
  • Electron spin resonance of an irradiated single crystal of urea oxalate, with W. Gordy . Journal of Chemical Physics , 35 , 362 (1961).
  • Molecular quadrupole moment of Nitric oxide. Nature , 186 , 881 (1960).
  • SPIE and Conference Proceedings


    Patents:

    1) Patent Number – 5,757,525 dated May 26, 1998, All Optical Devices (includes switches, modulators and logic gates).
    2) Patent Number – 5,854,710 dated Dec. 29, 1998, Optical Fourier Processing (includes edge enhancement, band pass filtering, noise removal and pattern recognition).
    3) Optical Fourier Systems and Methods for Medical Image Processing, filed October 11, 2002.
    4) Systems and Methods for Limiting Power using Photo-induced Anisotropy, filed June 30, 2003.
    5) Phase based digital image processing techniques for computer aided diagnosis, filed February, 2005.


    PROFESSIONAL POSITIONS (Postdoctoral):

  • Lecturer in Physics, Andhra University, 1957-1959; 1961-1963.
  • Research Associate, Physics Department, Duke University,
  • Durham , North Carolina, 1959-1961.
  • Senior Scientist, Solid State Physics Laboratory, Delhi, India 1963-1966; Leader of Magnetic Resonanance Group.
  • Research Physicist, Maser Optics, Inc. July 1966-April,1968.
  • Manager, Research Division, Spacerays, Inc., April 1968-August 1968.
  • Associate Professor, University of Massachusets at Boston, September 1968-1975.
  • Professor of Physics, University of Massachusetts at Boston, 1975 - to the present
  • Chairman, Physics Department 1978-1980; Graduate Program Director, Applied
  • Physics Graduate Program 1986 - 1988, 1992 – 1995, 1997- to the present

  • Other Positions Or Fellowships (Held concurrent with above positions):

  • Research Fellow, Division of Engineering and Applied Physics, Harvard University 1967-1969.
  • Visiting Research Professor of Physics, I.I.T., Madras 1983.
  • Adjunct Professor of Physics, University of Masschusetts Amherst 1991 -
  • Adjunct Professor of Physics, University of Massachusetts Lowell 1994 -

  • Links:

    Laser Technology
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