Volkmar Dierolf

Prof Dierolf came to Lehigh in 2000 with a Ph.D in Physics from the University of Utah, and a Habilitation from the University of Paderborn, Germany, He is the current Chair of the Physics Department and holds a Joint appointment with the Materials Science Department. In 2008, he was a Visiting Mercator Professor at the University of Bonn.    He is on the International Committees of both the International and the European Conference on Defect in Insulating Materials (ICDIM, EuroDIM). He has served as a Principal Editor for the Journal of Materials Research and has been Guest Editor for Optical Materials. His  research is focused on the optical spectroscopy and microscopy of insulating and semiconducting materials. His group  exploits  the wealth of information that can be obtained by combining high spatial resolution (down to 50nm) of a near field optical microscope or a SEM instrument with the structural and atomic scale information contained in excitation-emission data, cathodoluminescence and Raman spectra.Current funded project includeMultifunctional Ferroelectric Single-crystal Architecture in Glass: Fabrication, Optical Properties, and Nanoscale Polar Order,  with Himanshu Jain MS&E) funded by NSF. This project also includes apartner in Japan and offers research exchange with Kyoto UniversityEnhancement of Radiative Efficiency with Staggered InGaN Quantum Well Light Emitting Diodes with  N Tansu, ECE;  funded by DOEDevelopment of Spectroscopic Imaging Optical Bottles for Analysis of Nanoparticles in Confinement with D. Ou-Yang and I. Biaggio, funded by NSFSite-Selective Optical and Magnetic Properties of Rare Earth Ion Doped Nitrides funded by NSF Materials World Network: Novel Material Platforms with Reduced Dimensionality for Next Generation Ferroelectric Photonics, funded by NSF. This project includes partners in Germany and offers research exchange with their institutions (U Bonn, HSU Hamburg).Laser Fabrication of Active Single-Crystal Architecture in Glass, with H. Jain funded by DOE-Office of ScienceSelected Publications: ( out 2 books, 3 book chapters, and >100 peer reviewed publications  Site Selective Spectroscopy of rare earth ions in gallium nitride based materials. Chapter 8 in Topics in Applied Physics 124: Rare-Earth Doped III-Nitrides for Optoelectronic and Spintronic Applications, (ed. K.P. O'Donnell, V. Dierolf Springer-Verlag, Berlin, Heidelberg, New York, 2010).Excitation pathways and efficiency of Eu ions in GaN by site-selective spectroscopy, Z. Fleischman, C. Munasinghe, A. J. Steckl, A. Wakahara, J. Zavada and V. Dierolf, Appl Phys B  97 607 (2009).Growths of staggered InGaN quantum wells light-emitting diodes emitting at 520-525 nm employing graded growth-temperature profile, H. Zhao, G. Liu, X. Li, G. S. Huang, J. D. Poplawsky, S. Tafon Penn, V. Dierolf, and N.Tansu, Appl. Phys. Lett. 95, 061104 (2009).Direct near-field optical imaging of UV bowtie nanoantennas, L. Zhou, Q. Gan, F. J. Bartoli, V. Dierolf, Optics Express, 17 20301 (2009).Directionally controlled 3D ferroelectric single crystal growth in LaBGeO5 glass by femtosecond laser irradiation, A. Stone, M. Sakakura, Y. Shimotsuma, G. Stone, P. Gupta, K. Miura, K. Hirao, V. Dierolf, H. Jain, Optics Express, 17, 23284 (2009).Direct mapping of the UV surface plasmons Q. Gan, L.Zhou,V. Dierolf, F.J.Bartoli, Optics Letters,  34, 1324-1326 (2009).Design and characteristics of staggered InGaN quantum-well light-emitting diodes in the green spectral regime, H Zhao, G Liu, X Li, R Arif, G Huang, J Poplawsky, S Tafon Penn, V. Dierolf, N. Tansu, Optoelectronics, 3,   283 (2009).UV Plasmonic Structures: Direct Observations of UV Extraordinary Optical Transmission and Localized Field Enhancement Through Nanoslits, Q. Gan, L. Zhou, V. Dierolf, F. Bartoli, Photonics Journal, 1, 245 (2009).Structure and energetics of Er defects in LiNbO3 from first-principles and thermodynamic calculations, H. Xu, D. Lee, S. B Sinnott, V. Gopalan, V. Dierolf, S.R Phillpot, Phys Rev B 80, 144104 (2009).Continuous-wave optical parametric terahertz source, R. Sowade, I. Breunig, I. C. Mayorga, J. Kiessling, C. Tulea, V. Dierolf, and K. Buse, Optics Express 17,22304 (2009).