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2000-1992 Publications

2000

  1. K. Gahagan, J. Casson, Gopalan, V.; Scrymgeour, D.A.; Robinson, J.M. , “ Integrated high-power electro-optic lens/scanner for space-based platforms” (Conference Paper in Journal). Proceedings of the SPIE - The International Society for Optical Engineering. Vol. 4134, pp. 133-7; (2000). PDF

  2. V. Gopalan, K. Kitamura, Y. Furukawa, “Domain reversal and wall structure of 180° ferroelectric domains in LiTaO3 crystals,”  Fundamental Physics of Ferroelectrics 2000, Aspen Center for Physics, Winter Workshop, Editor: R. E. Cohen, p 183-190,  American Institute of Physics (2000). PDF

  3. Yang, T.J. ; Gopalan, V. ; Swart, P. ; Mohideen, U. “Experimental study of internal fields and movement of single ferroelectric domain walls “Journal of the Physics and Chemistry of Solids61, 275 (2000). PDF

  4. Kitamura, K.; Furukawa, Y.; Takekawa, S.; Hatanaka, T.; Ito, H.; Gopalan, V.; Injeyan, H.; Keller, U.; Marshall, C., “Domain switching performance of stoichiometric LiTaO3 for bulk quasi-phase matching devices” OSA Trends in Optics and Photonics. Advanced Solid State Lasers. Vol.34. Proceedings. Opt. Soc. America, Washington, DC, USA. pp. 321-3; (2000).

  5. S. Kim, B. Steiner, V. Gopalan, “Direct X-ray Synchrotron imaging of strains at 180° domain walls in congruent LiNbO3 and LiTaO3 crystals,” Appl. Phys. Lett. 77, 2051-53 (2000). PDF

  6. C. C. Battle, S. Kim, V. Gopalan,  K. Borkacy, M. C. Gupta, “Ferroelectric domain reversal in congruent LiTaO3 at elevated temperatures,” Appl. Phys Lett. 76, 2436 (2000).  PDF

1999

  1. T. J. Yang, U. Mohideen, V. Gopalan, P. J. Swart, "Observation of mobility study of single 180° domain wall in LiTaO3" Ferroelectrics 222 (1-4), 609 (1999).

  2. V. Gopalan, Q. X. Jia, T. E. Mitchell, “ In-situ video observation of 180° domain kinetics in congruent LiNbO3 crystals,” Appl. Phys. Lett. 75, 16 (1999).  PDF

  3. V. Gopalan, A. Itagi, S. Gerstl, P. Swart, Q. X. Jia, T. E. Mitchell, T. E. Schlesinger, D. D. Stancil, “Ferroelectric domain kinetics in congruent LiTaO3,” Integrated Ferroelectrics, 27, 137 (1999).

  4. K. T. Gahagan, V. Gopalan, J. M. Robinson, Q. X. Jia, T. E. Mitchell, M. J. Kawas, T. E. Schlesinger, D. D. Stancil, “ Fabrication and characterization of high-speed integrated electro-optic lens and scanner devices.” Proceedings of the SPIE,  3620, (1999). PDF

  5. Yi Chiu, V. Gopalan, M. J. Kawas, T. E. Schlesinger, D. D. Stancil, W. P. Risk, “Integrated optical device with second-harmonic generator, electrooptic lens, and electrooptic scanner in LiTaO3,” J. Lightwave Technol.  17, 462 (1999).

  6. K. T. Gahagan, V. Gopalan, J. M. Robinson, Q. X. Jia, T. E. Mitchell, “ Integrated Electro-optic lens/scanner in LiTaO3 single crystal,” Applied Optics, 38, 1186 (1999).  PDF

  7. J. C. Fang, M. J. Kawas, J. Zou, V. Gopalan, T. E. Schlesinger, D. D. Stancil, “Shape-optimized electrooptic beam scanners: Experiment,” IEEE Photonic Technol. Lett. 11, 1041 (1999). PDF

  8. V. Gopalan, K. T. Gahagan, M. Kawas, Q. X. Jia, J. M. Robinson, T. E. Mitchell, T. E. Schlesinger, D. D. Stancil, “Integration of electro-optic lenses and scanners on ferroelectric LiTaO3,” Integrated Ferroelectrics, 25, 31 (1999).

  9. V. Gopalan, S. S. A. Gerstl, A. Itagi, Q. X. Jia, T. E. Mitchell, T. E. Schlesinger, D. D. Stancil, “Mobility of 180° domain walls in congruent LiTaO3 measured using in-situ electro-optic imaging microscopy,” J. Appl. Phys. 86, 1638 (1999).  PDF

  10. V. Gopalan , T. E. Mitchell, “In situ video observation of 180° domain switching in LiTaO3 by electro-optic imaging microscopy", J. Appl. Phys., 85, 2304 (1999).  PDF

  11. V. Gopalan, T. E. Mitchell, K. E. Sickafus, “Switching kinetics of 180° domains in congruent LiNbO3 and LiTaO3 crystals,” Solid State Communications, 109, 111 (1999).

  12. T. J. Yang, U. Mohideen, V. Gopalan, P. Swart, “Direct observation of pinning and bowing of a single ferroelectric domain wall,”  Phys. Rev. Lett. 82, 4106 (1999).  PDF

  13. Gim, Y.; Gahagan, K.T.; Kwon, C.; Hawley, M.; Gopalan, V.; Robinson, J.M.; Mitchell, T.E.; Jia, Q.X. “Growth of LiNbO3 films on single crystal sapphire substrates using pulsed laser deposition”, Integrated Ferroelectrics. Vol. 25, Iss. 1-4, pp. 91-102; (1999).

1992 - 1998

  1. V. Gopalan , T. E. Mitchell, K. Kitamura, N. Furukawa“ The role of stoichiometry in 180° domain switching in LiNbO3 crystals,” Appl. Phys. Lett. , 72, 1981 (1998). PDF

  2. V. Gopalan, Terence E. Mitchell, “Wall velocities, Switching times, and stabilization mechanism of 180° domains in congruent LiTaO3 crystals” J. Appl. Phys., 83, 941, (1998).  PDF

  3. K. Kitamura, Y. Furukawa, K. Niwa, V. Gopalan, T. E. Mitchell, “Crystal growth and low coercive field 180° domain switching characteristics of stoichiometric LiTaO3,” Applied Physics Letters, 73, 3073 (1998). PDF

  4. V. Gopalan, Kurt Sickafus, Terence E. Mitchell, “Real-time domain kinetics in LiTaO3 crystals” Integrated Ferroelectrics , 22, 405[925] (1998).

  5. V. Gopalan, Terence E. Mitchell, Q. X. Jia, J. M. Robinson, M.J. Kawas, T. E. Schlesinger, D. D. Stancil, “Ferroelectrics as a versatile solid state platform for integrated optics” Integrated Ferroelectrics, 22,465 [985](1998).

  6. J. N. Mitchell, R. Devanathan, N. Yu, K. E. Sickafus, C. J. Wetteland, V. Gopalan, M. A. Nastasi, K. J. McClellan, “ Radiation effects in corundum structure derivatives,” Nuclear Instruments and Methods in Physics Res. B 141, 461 (1998). PDF

  7. Matthew Kawas, V. Gopalan,  T. E. Schlesinger, Daniel D. Stancil, “ Electro-optic Lens stack on LiTaO3  crystals,” J. Lighwave Technol. 15, 1716 (1997)

  8. V. Gopalan and M. C. Gupta, “Origin of internal fields and visualization of 180° domains in congruent LiTaO3 crystals,” J. Appl. Phys. 80, 6099-106 (1996). PDF

  9. V. Gopalan and Mool C. Gupta, “Observation of internal field in LiTaO3 single crystals: Its origin and time-temperature dependence ,” Appl.Phys.Lett., 68, 888 (1996). PDF

  10. V. Gopalan, Matthew Kawas, T. E. Schlesinger, Mool C. Gupta, and Daniel D. Stancil, “ Integrated quasi-phase-matched second-harmonic generator and electrooptic scanner on LiTaO3 single crystals.” IEEE Photonics Technology Letters, 8, 1704 (1996) ; also presented CLEO’96. PDF

  11. V. Gopalan and Rishi Raj, “ Domain Structure and Phase transitions in epitaxial KNbO3 thin films observed by in-situ Second Harmonic Generation measurements,” Appl. Phys.Lett., 68, 1323 (1996).  PDF

  12. V. Gopalan and Mool C. Gupta, “Periodic Domain Inversion in Z-cut LiTaO3 by Electron-Beam scanning assisted by an internal field within the Crystal, Proceedings, SPIE Vol. 2700, 196 (1996). PDF

  13. V. Gopalan and R. Raj, “ Domain wall pinning by grain boundaries in epitaxial KNbO3 thin films studied by in-situ Second harmonic Generation,” Ferroelectric Thin Films VI,  493, Proceedings, Materials Research Society, Boston, p. 75, December (1997).

  14. C. J. Wetteland, K. E. Sickafus, V. Gopalan, J. N. Mitchell, T. Hartmann, M. Nastasi,  C. J. Maggiore, J. R. Tesmer, T. E. Mitchell, “Radiation damage effects in ferroelectric LiTaO3 single crystals, “ProceedingsMaterials Research Society, Fall Meeting,  at Boston, December (1997). PDF

  15. V. Gopalan and Mool C. Gupta, “Internal fields in lithium tantalate single crystals,” Proccedings, SPIE, Vol. 2700, 28 (1996). PDF

  16. V. Gopalan, Rishi Raj, “In-Situ X-Ray Diffraction Study of Phase Transitions in Epitaxal KNbO3 Thin Films,” Ferroelectrics  200, Numbers 1-4 pp. 343-351(1997).

  17. V. Gopalan, and Mool C. Gupta, “Origin and characteristics of internal fields in LiNbO3 crystals,” Ferroelectrics  198, 1-4 pp. 49-59 (1997);.

  18. V. Gopalan, and Mool C. Gupta, “Origin of internal field and visualization of 180° domains in congruent LiTaO3 crystals,” J. Appl. Phys. 80, 6099 (1996).  PDF

  19. Daniel D. Stancil, V. Gopalan, M. Kawas,  M. C. Gupta, J. Li, “Integrated second harmonic generator and high speed optical beam scanner for data storage,” Idema Insight, 9 (5) 4 (1996).

  20. V. Gopalan and Rishi Raj,  “ Structure-Optical Property Correlation of Epitaxial Potassium Niobate Thin Films Deposited on Magnesium Oxide (100) Substrates Using a Strontium Titanate Transition layer,” J. Am. Cer. Soc., 78, 1825 (1995). PDF

  21. V. Gopalan, Huyang Xie, Wei-Yung Hsu and Rishi Raj,  “ Orientation Control of KNbOthin films deposited by laser ablation on single crystal MgO substrates using SrTiO3 transition layers”, Ferroelectrics, 152, 55 (1994).

  22. V. Gopalan and Rishi Raj, “ Domain Structure-Second Harmonic Generation Correlation in Potassium Niobate thin films on Strontium Titanate substrates,” J.Am.Cer. Soc, 79, 3289 (1996). PDF

  23. V. Gopalan and Rishi Raj, “Electric field induced domain rearrangement in potassium niobate thin films studied by in situ second harmonic generation measurements,” J. Appl. Phys, 81, 865 (1996). PDF

  24. W. Y. Hsu, Gabriel Braunstein,V. Gopalan, Craig S. Willand and Mool C. Gupta, “Correlation between Structural and Optical  properties in Proton-Exchanged LiNbO3,” Appl. Phys. Lett. 61, 3083 (1992).  PDF

  25. W. Y. Hsu, Craig S. Willand, V. Gopalan, and Mool C. Gupta, “ Effect of Proton Exchange on the non-linear optical properties of LiNbO3 and LiTaO3,” Appl. Phys. Lett. 61, 2263 (1992).  PDF

  26. Alan C. G. Nutt,  V. Gopalan and Mool C. Gupta, “Domain inversion in LiNbO3 using direct electron-beam writing,” Appl. Phys. Lett. 60, 2828 (1992).  PDF

  27. V. Gopalan, Thomas A. Strasser, W.Y. Hsu and Mool C. Gupta, “Design of high efficiency Quasi-Phase matched devices for Second Harmonic Generation, Part A - Waveguide Structure effects,” Technical report (284158D), Eastman Kodak Company, Rochester, NY (Dec. 1992).

  28. T. A. Strasser, V. Gopalan, W. Y. Hsu, and Mool C. Gupta, “Design of high efficiency Quasi-Phase matched devices for Second Harmonic Generation, Part B - Domain Shape Effects,” Technical report (284157C), Eastman Kodak Company, Rochester, NY (Dec 1992).