Staff profile

Dr Julius Orwa

Lecturer

Faculty of Science, Technology and Engineering

School of Engineering and Mathematical Sciences
Department of Physics

Melbourne (Bundoora)

 

Qualifications

B.A. Hons, MSc, PhD

Area of study

Physics

Recent Publications

  •  J.O. Orwa, K. Ganesan, J. Newnham, C. Santori, P. Barclay, K.M.C. Fu, R.G. Beausoleil, I. Aharonovich, B.A. Fairchild, P. Olivero, A.D. Greentree, S. Prawer, "An upper limit on the lateral vacancy diffusion length in diamond", Diam. Rel. Mater. 24 (2012) 6.
  • W.H. Jay and J.O. Orwa, “Raman spectroscopy applied to early (ca. 1746-1754) English steatitic porcelains: A tentative study of compositions", J. Ram. Spec., 43 (2012) 307.
  • M. R. Henderson,* B. C. Gibson, H. Ebendorff-Heidepriem, K. Kuan, S. Afshar V., J. O. Orwa, I. Aharonovich, S. Tomljenovic-Hanic, A. D. Greentree, S. Prawer, and T. M. Monro, “Diamond in Tellurite Glass: a New Medium for Quantum Information”, Adv. Mater. 23 (2011) 2806.
  • J.O. Orwa, C. Santori, K.M.C. Fu, B. Gibson, D. Simpson, I. Aharonovich, A. Stacey, A. Cimmino, P. Balog, M. Markham, D. Twitchen, A.D. Greentree, R.G. Beausoleil and S. Prawer, ” Engineering of nitrogen-vacancy color centers in high purity diamond by ion implantation and annealing”, J. Appl. Phys. 109 (2011) 083530.
  • Drumm, V. S., Alves, A. D. C., Orwa, J. O., Jamieson, D. N., McCallum, J. C., Prawer, S. and Ryan, C. C. G., “Lattice location of nickel in diamond by RBS channelling and PIXE.” Phys. Stat. Sol (A), 208 (2011) 42.
  • J.O. Orwa, A.D. Greentree, I. Aharonovich, A.D.C. Alves, J. Van Donkelaar, A. Stacey and S. Prawer, “Fabrication of single optical centres in diamond—a review”, J. Lumin., 130 (2010) 1646.
  •  A. Stacey, B. C. C. Cowie, J. Orwa, S. Prawer and A. Hoffman, “Diamond C 1s core-level excitons: Surface sensitivity” Phys. Rev. B 82 (2010) 125427. 
  • Sh. Michaelson, A. Stacey, J. Orwa, A. Cimmino, S. Prawer, B.C.C. CowieO.A. Williams, D.M. Gruen and A. Hoffman,  “Bulk and surface thermal stability of ultra nanocrystalline diamond films with 10–30 nm grain size prepared by chemical vapor deposition”, J. Appl. Phys, 107 (2010) 093521.
  • J.O. Orwa, I. Aharonovich, F. Jelezko, G. Balasubramanian, P. Balog, M. Markham, D.J. Twitchen, A.D. Greentree and S. Prawer, “Nickel related optical centres in diamond created by ion implantation”, J. Appl. Phys. 107 (2010) 093512. 
  • J.O. Orwa, J.L. Peng, J.C. McCallum, D.N. Jamieson, S. Rubanov and S. Prawer, “Microstructure evolution in carbon-ion implanted sapphire”, J. Appl. Phys. 107 (2010) 023508.
  • I. Aharonovich, C. Santori, B.A. Fairchild, J.O. Orwa, K. Ganesan, K.-M.C. Fu, R.G. Beausoleil, A.D. Greentree and S. Prawer, “Producing optimized ensembles of nitrogen-vacancy color centers for quantum information applications “ J. Appl. Phys. 106 (2009) 124904.
  • A. Stacey, Sh. Michaelson, J. Orwa, S. Rubanov, S. Prawer, B.C.C. Cowie and A. Hoffman,  “Near coalescent submicron polycrystalline diamond films deposited on silicon: Hydrogen bonding and thermal enhanced carbide formation”, J. Appl. Phys. 106 (2009) 103503.
  • I. Aharonovich, C. Zhou, A. Stacey, J. Orwa, S. Castelletto, D. Simpson, A.D. Greentree, F. Teussart, J.F. Roch and S. Prawer, " A new, enhanced diamond single photon emitter in the near infra-red", Phys. Rev. B 79 (2009) 235316.
  • M.A. Stevens-Kalceff, S. Prawer, W. Kalceff, J.O. Orwa, J.L. Peng, J.C. McCallum, D.N. Jamieson, "Cathodoluminescence microanalysis of diamond nanocrystals in fused silicon dioxide", J. Appl. Phys., 104 (2008) 113514.

 

Recent Refereed Conference Publications

  • B. C. Gibson, S. Castelletto, T. J. Karle, S. Tomljenovic-Hanic, I. Aharonovich, B. C. Johnson, J. Orwa, M. R. Henderson, H. Ebendorff-Heidepriem, K. Kuan, S. Afshar V., T. M. Monro, A. D. Greentree and S. Prawer, Towards Hybrid Diamond Optical Devices, 13th International Conference on Transparent Optical Networks, IEEE(Stockholm), 2011, Ed. M Jaworski, M Marciniak, pp. 1-4.
  • S. Tomljenovic-Hanic, I. Aharonovich, S. Castelletto, B. Fairchild, K. Ganesan, B. Gibson, A. Greentree, J. Orwa, S. Rubanov, D. Simpson, A. Stacey and S. Prawer, “Towards All-Diamond Optical Devices”, 12th International Conference on Transparent Optical Networks, IEEE(Chennai), 2010, Ed. M Jaworski, M Marciniak, pp. 1-4.
  • M.A. Draganski, B.A. Fairchild, A. Alves, E. Finkman, J. Orwa, S. Rubanov, B. Gibson, K. Ganesan, P. Spizzirri, A. Greentree, P.N. Johnston, D. Jamieson and S. Prawer,  “The refractive index of ion implanted diamond” Australian Institute of Physics 18th National Congress incorporating the 27th Plasma Science Conference, Ed. R. Clay,  pp 175-178, 2008.

 

 

 

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Older Publications

  • J.O. Orwa, J.M. Shannon, R.G. Gateru and S.R.P. Silva, “Effect of Ion Bombardment and Annealing on the Electrical Properties of Hydrogenated Amorphous Silicon Metal-Semiconductor-Metal structures”, J. Appl. Phys., 97 (2005) 023519.
  • R.G. Gateru, J.O. Orwa and J.M. Shannon, “Polarity Dependent Forming in Ion Bombarded Amorphous Silicon Memory Devices”, J. Appl. Phys., 97 (2005) 024506.
  • J.O. Orwa, J.M. Shannon and S.R.P. Silva, “Forming in Hydrogenated Amorphous Silicon MSM Devices Using Bipolar Pulse Stressing.”,  Electr. Lett., 41 (2005) 98.
  • J.O. Orwa, I. Andrienko , J.L. Peng, S. Prawer, Y.B. Zhang and S.P. Lau, “Thermally induced sp2 Clustering in Tetrahedral Amorphous Carbon”, J. Appl. Phys.,  96 (2004) 6286. 
  •  S. Prawer, I. Rosenblum, J.O. Orwa and J. Adler, “Identification of the Point Defects in Diamond as Measured by Raman Spectroscopy: Comparison Between Experiment and Computation”, Chem. Phys. Lett., 390 (2004) 458.
  •  J.O. Orwa, S. Prawer, D.N. Jamieson,  J.L. Peng, J.C. McCallum, K.W. Nugent, Y.J. Li, L.A. Bursill and S.P. Withrow,  “Diamond Nanocrystals Formed by Direct Implantation of Fused Silica with Carbon”, J. Appl. Phys., 90 (2001) 3007.
  • J.L. Peng, J.O. Orwa, B. Jiang, S. Prawer, L.A. Bursill, “Nano-Crystals of c-Diamond, n-Diamond and I-Carbon Grown in Carbon-Ion Implanted Fused Quartz”, Int. J. Mod. Phys. B, 15 (2001) 3107
  • J.L. Peng, L.A. Bursill, B. Jiang, J.O. Orwa and S. Prawer, “Growth of c-Diamond, n-Diamond and I-Carbon Nanophases in Carbon-ion Implanted Fused Quartz”, Phil. Mag. B, 81 (2001) 2071.
  • J.O. Orwa, K.W. Nugent, D.N. Jamieson and S. Prawer, “Raman Investigation of Damage caused by Deep ion Implantation in Diamond”, Phys. Rev. B, 62 (2000) 5461.
  •  S. Prawer, J.L. Peng, J.O. Orwa, J.C. McCallum, D.N. Jamieson and L.A. Bursill, “The Size Dependence of Structural Stability in Nanocrystalline Diamond”, Phys. Rev. B,  62 (2000) R16360.
  • S. Prawer, K.W. Nugent, D.N. Jamieson, J.O. Orwa, L.A. Bursill and J.L. Peng, “The Raman Spectrum of Nanocrystalline Diamond”,  Chem. Phys. Lett., 332 (2000) 93.
  • J.O. Orwa, D.N. Jamieson, S. Prawer and J.C. McCallum, “Carbon Diffusion and Nanocrystalline Diamond Formation in Carbon Ion-Implanted Oxides Studied by Nuclear Elastic Scattering”, Nucl. Instr. and Meth. in Phys. Res. B, 175-177 (2001) 554.
  • J.L. Peng, J.O. Orwa, B. Jiang, S. Prawer and L.A. Bursill, Int. J. of Mod. Phys. B, 15 (2001) 3107.
  • J.O.Orwa, J.C. McCallum, S. Prawer, K.W. Nugent and D.N. Jamieson, Diam. Rel. Mat., 8 (1999) 1642.
  • M.A. Stevens Kalceff, M.R. Phillips, M. Toth, A.R. Moon, D.N. Jamieson, J.O. Orwa and S.Prawer, “Cathodoluminescence Microanalysis of Electron Irradiation Damage in Wide Band Gap Materials”, Mater.Res. Soc. Symp. Proc., 540 (1999) 43.
  • K. Bhattacharya, J.O. Orwa and S.M. Goodnick, “Two-dimensional electron transport in selectively doped n-AlGaAs/InGaAs/GaAs pseudomorphic structures”, J. Appl. Phys, 73 (1993)4396.

Research projects