Photonic
Materials and Devices
Oxide
Thin Films
Compound Semiconductors
Spintronic
III-V Semiconductors
Oxide Thin Films
Sponsorship: NSF DMR-0520513, DMR-0605292, Argonne
"Low temperature deposition of epitaxial BaTiO3 films in a rotating disk
vertical MOCVD reactor," with A. M. Dhote, A. L. Meier, D. J. Towner,
B. W. Wessels, J. Ni, and T. J. Marks, JVST B, 23 4, 1674-1678 (2005).
"Integration of BaTiO3 on Si (001) using MgO/STO buffer layers by molecular
beam epitaxy," with F. Niu, A. R. Meier, and B. Wessels, J. Cryst. Growth
294, 401-406 (2006).
"Epitaxial growth and strain relaxation of MgO thin films on Si grown
by molecular beam epitaxy," with F. Niu, A. L. Meier, and B. W. Wessels,
J. Vac. Sci. Technol. B 24(6), 1071-1023 (2006).
“Complex electrical (impedance/dielectric) properties of electroceramic
thin films by impedance spectroscopy with interdigital electrodes” N.
J. Kidner, A. Meier,, Z. J. Homrighaus, B. W. Wessels, T. O. Mason and E. J.
Garboczi, Thin Solid Films 515 4588 (2007).
“Surface and interfacial structure of epitaxial SrTiO3 thin films
on (001) Si grown by molecular beam epitaxy,” with F. Niu and B.W. Wessels,
J. of Crystal Growth 300 509-518, (2007).
“Phase stability of heteroepitaxial polydomain BaTiO3 thin films,” with
A.L. Meier, A.Y. Desai, L. Wang, T.J. Marks and B.W. Wessels, J. Mater. Res.,
22, 1354 (2007).
“Investigation of heteroepitaxial growth of magnetite thin films,” with
G.E. Sterbinsky, J. Cheng, P.T. Chiu, B.W. Wessels, and D.J. Keavney, J. Vac.
Sci. Technol. B 25, 1359 (2007).
“Epitaxial Fe3O4 on SrTiO3 characterized by transmission electron
microscopy,” with J.G. Zheng, G.E. Sterbinsky, J. Cheng, and B.W. Wessels, J.
Vac. Sci. Technol. B 25, 659 (2007).
“Magnetic and magneto-optical properties of heteroepitaxial magnetite
thin films,” with J. Cheng, G.E. Sternbinsky, B.W. Wessels, Journal of
Crystal Growth, 310 16, 3730-3734 (2008).
“Dynamic response of polydomain ferroelectric barium titanate epitaxial
thin films and its field dependence,” with Zhifu Liu, A.L. Meier, and
B. W. Wessels, Journal of Appl. Phys., 104 064115 (2008).
“Highly efficient broadband second harmonic generation using polydomain
epitaxial barium titanate thin film waveguides,” with Pao Tai Lin and
Bruce W. Wessels, Appl. Phys. Lett., 92 221103 ( 2008).
“Synthesis, structural and magnetic properties of epitaxial MgFe2O4
thin films by molecular beam epitaxy,” with J. Cheng, V.K. Lazarov, G.E.
Sterbinsky, and B.W. Wessels, J. of Vacuum Science & Technology B, 27
1, 148-151(2009).
“Polarization reversal and backswitching dynamics in epitaxial BaTiO3
thin films,” with Jianheng Li, Pao Tai Lin and B.W. Wessels, J. Appl.
Phys. 106 054113 (2009).
“Domain dynamics in BaTiO3 thin films with a multidomain structure,” with
B.W. Wessels and A.L. Meier, submitted to J. Phys: Condensed Matt. (2009).
“Magnetic properties of ferromagnetic epitaxial Fe3O4/CoFe2O4 bilayers
and superlattices,” with J. Cheng and B.W. Wessels, submitted to J. Appl.
Phys. (2009).
“Strain-driven spin reorientation in magnetite/barium titanate heterostructures,
G. E. Sterbinsky, B. W. Wessels, J-W Kim, E. Karapetrova, P. J. Ryan and D.
J. Keavney, Appl. Phys. Lett. 96 9 092510 (2010).
“Study of domain reversal and its field-dependence in epitaxial BaTiO3 thin films,” with Li JH, Liu ZF, B. W. Wessels, Journal of Applied Physics 107 124106 (2010).
“Local electronic and magnetic structure of mixed ferrite multilayer materials,” with D.M. Wells, J. Cheng, D.E. Ellis, B.W. Wessels, Phys. Rev B, 81 17 174422 (2010).
“Defect and interfacial structure of heteroepitaxial Fe3O4/BaTiO3,” with S.J. Xie, G.E. Sterbinsky, B.W. Wessels, VP Dravid, Microscopy and Microanalysis, 16 3 300-305 (2010).
“Using the infrared magnetorefractive effect to compare the magnetoresistance in (100) and (111) oriented Fe3O4 films,” with S.M. Thompson, V.K. Lazarov, R.C. Bradley, T. Deakin, B. Kaeswurm, G.E. Sterbinsky, J. Cheng, B.W. Wessels, J. Appl. Phys. 107 9 09B102 (2010).
Compound Semiconductors
(supported by DTRA HDTRA 1-09-044)
"Investigation of composition fluctuations in GaN:Mg using optical transmission
spectroscopy, near-field scanning optical microscopy and scanning Kelvin probe
microscopy," with B. Han, B. W. Wessels, and M. P. Ulmer, J. Appl. Phys,
97 1, 023513: 1-6, (2005).
"Three-dimensional nanoscale composition mapping of semiconductor nanowires," with
D. E. Perea, J. E. Allen, S. J. May, B. W. Wessels, D. N. Seidman, and L. J.
Lauhon, Nano Letters, 6 2, 181-185 (2006).
"Investigation of nanoscale composition fluctuations in InGaN using optical
transmission spectroscopy and near-field scanning optical microscopy," with
B. Han, B. Wessels, and M. Ulmer, Journal of Applied Physics 99, 084312 (2006).
“Thallium Chalcogenide-Based Wide-Band-Gap Semiconductors: TIGaSe(2) for Radiation Detectors,” with Simon Johnsen, Zhifu Liu, John Peters, B.W. Wessels, et al., Chemistry of Materials, 23 12 3120-3128 (2011).
“Thallium Chalcohalides for X-ray and gamma-ray detection,” with Simon Johnsen, Zhifu Liu, John A Peters, B.W. Wessels, et al., J. of the American Chemical Society, 26 10030-10033 (2011).
“Thallous chalcogenide Tl6I4Se for radiation detection at X-ray and gamma-ray energies”, Z. Liu, J. A. Peters, B.W. Wessels et al, Nucl. Instrum. Methods 659 333 (2011).
“Dimensional Reduction: A design tool for new radiation detection materials”, Androulakis John; Peter Sebastian C.; Li Hao, Advanced Materials, 23 4163 (2011).
“Photoluminescent properties of semiconducting Tl6I4Se”, N. K. Cho, J. A. Peters, Z. Liu, B.W. Wessels et al., Semicond. Sci and Technol., 27 (2012).
Photonic Materials and Devices
Sponsorship: NSF ECS-0123469, NSF ECCS-0801684
"Performance simulation for ferroelectric thin-film based waveguide electro-optic
Modulators," with D.-G. Sun, Z. Liu, Y. Huang, S.-T. Ho, D. Towner, and
B. W. Wessels, Optics Communications, 225, 319-330 (2005).
"High-Speed Traveling Wave BaTiO3 Thin Film Electrooptic Modulators," with
P. Tang, A. L. Meier, D. J. Towner, and B. W. Wessels, Electronics Letters,
41 23, 1296-1297 (2005).
"Barium Titanate Thin Film Electro-Optic Modulator with Low Half-Wave
Voltage at 1310nm," with Z. Liu, B. Liu, G. Xu, S.-T. Ho, P. Tang, A.
L. Meier, D. J. Towner, and B. W. Wessels, Conference on Lasers and Electro-Optics,
3, 1870-1872 (2005)
"Ultra-wide bandwidth, thin film electro-optic modulators," with
P. Tang, A. L. Meier, D. J. Towner, and B. W. Wessels, PacRim Conference Proceedings,
2005.
“Nonlinear photonic crystal waveguide structures based on barium
titanate thin films and their optical properties,” with Z.F. Liu, P.T.
Lin, B.W. Wessels et al., Appl. Phys. Lett. 90 201104, (2007).
“Ferroelectric epitaxial thin films for integrated optics” B. W.
Wessels, Ann. Rev. Mater. Res. 37 659 (2007)
“Bragg reflector waveguide and electro-optic modulator based on barium
titanate epitaxial thin films,” with Z. Liu, P.T. Lin, and B.W. Wessels,
MRS Proc., 1014 (2007).
“Simulation and fabrication of two dimensional nonlinear photonic
crystals using barium titanate thin films,” with P.T. Lin, Z. Liu, and
B.W. Wessels, MRS Proc. 1014 (2007).
"Cascaded Bragg reflectors for a barium titanate thin film electro-optic
modulator," with Z. Liu, P.-T. Lin, and B. W. Wessels, J. of Optics A,
10, 015302 (2008).
“Highly efficient broadband second harmonic generation using polydomain
epitaxial barium titanate thin film waveguides,” with Pao Tai Lin and
Bruce W. Wessels, Appl. Phys. Lett., 92 221103 ( 2008).
“Two-Dimensional Ferroelectric Photonic Crystal Waveguides: Simulation,
Fabrication, and Optical Characterization,” with Pao Tai Lin, Fei Yi,
Seng-Tiong Ho, and B.W. Wessels, Journal of Lightwave Technology, 27 4330-4337
(2009).
“Thin film ferroelectric photonic crystals and their application to thermo-optic
switches,” with Pao Tai Lin, Alexandra Imre, Leonidas E. Ocola, and B.W.
Wessels, Optics Communications, 282 16, 3364-3367 (2009).
“Ferroelectric thin film photonic crystal waveguide and its electro-optic
properties,” with P.T. Lin, Z. Liu, and B.W. Wessels, Journal of Optics
A: Pure and Applied Optics, 11 075005 (2009).
“Ferroelectric Thin Film Microcavities and Their Optical Resonant Properties,” with
Pao Tai Lin, William A. Russin, Alexandra Imre, Leonidas E. Ocola and B.W.
Wessels, Materials For Nanophotonics- Plasmonics, Metamaterials and Light
Localization, MRS Proc. 1182 21-26 (2009)
“Hexagonal photonic crystal waveguide based on barium titanate thin films,” with Jianheng Li, Zhifu Liu, B.W. Wessels, et al., Optical Components and Materials VIII, SPIE 7934 79340R (2011).
“Ultrafast modulators based on nonlinear photonic crystal waveguides,” with Zhifu Liu, Jianheng Li, Tu Yongming, B.W. Wessels, et al., Advances In Slow And Fast Light IV, SPIE 7949 794905 (2011).
Spintronic III-V Semiconductors
(supported by NSF ECS-0224210, NSF DMR-0076077, AFOSR FA9550-07-1-0381; NSF
DMR-0804479)
"Local Environment of Ferromagnetically Ordered Mn in Epitaxial InMnAs," with
P. T. Chiu, B. W. Wessels, D. J. Keavney, and J. W. Freeland, Appl. Phys. Lett.,
86 072505, 1-3 (2005).
"Optical investigation of electronic states of Mn4+ ions in p-type GaN," with
B. Han and B. W. Wessels, Appl. Phys. Lett., 86 042505, 1-3 (2005).
"Dendritic nanowire growth by a self-assemble catalyst" with S. J.
May, J-G. Zheng, B. W. Wessels and L. J. Lauhon, Advanced Materials, 17 598-602
(2005).
"Electronic and magnetotransport properties of ferromagnetic p-(In,Mn)As/n-InAs
heterojunctions", with S. J. May and B. W. Wessels, JVST B, 23 4, 1769-1772
(2005).
"Magnetic anisotropy in epitaxial InMnAs," with P. T. Chiu, S. J.
May, A. J. Blattner, and B. W. Wessels, Physics of Semiconductors, AIP Conference
Proceedings, 772 347 (2005).
"Ferromagnetic Self-Assembled Quantum Dots on Semiconductor Nanowires," with
D. G. Ramlan, S. J. May, J.-G. Zheng, J. E. Allen, B. W. Wessels, and L. J.
Lauhon, Nano Letters, 6 1, 50-54 (2006).
"Direct observation of room temperature magnetism in (In,Mn)As thin films
by magnetic force microscopy," with S. J. May, A. J. Blattner, D. P. Eam,
and B. W. Wessels, Applied Surface Science, 252 10, 3509-3513 (2005).
"High field magnetoresistance in p-(In,Mn)An/n-InAs heterojunctions," with
S. J. May and B. W. Wessels, Applied Physics Letters, 88 7, 072105 (2005).
"Origin of uniaxial magnetic anisotropy in epitaxial InMnAs this films," with
P. Chiu, S. May, and B. Wessels, Journal of Applied Physics 99, 083907 (2006).
"Evidence of room temperature sp-d exchange in InMnAs epitaxial films," with
P. T. Chiu and B. Wessels, Applied Physics Letters 89, 102505 (2006).
"Magnetic properties of MnAs thin films on GaAs(001) by MOVPE," with
G. E. Sterbinsky, S. J. May, P. T. Chiu, and B. Wessels, Physica C (2006).
"Composition analysis of single semiconductor nanowires using pulsed-laser
atom probe tomography," with D. E. Perea, J. L. Lensch, S. J. May, B.
W. Wessels, and L. J. Lauhon, Applied Physics A 85, 271-275 (2006).
"Negative magnetoresistance in Ni/oxide/InMnAs tunnel junctions," with
S. J. May and B. Wessels, Journal of Applied Physics 100, 053912 (2006).
“Dependence of magnetic circular dichroism on doping and temperature
dependence in In1-xMnxAs epitaxial films” P. T. Chiu and B. W. Wessels, Phys.
Rev. B 76 165201 (2007).
“Ferromagnetic semiconductors and the role of disorder,” by
Bruce W. Wessels, New Journal of Physics, 10, 055008 (2008).
“Magnetocapacitance effect in InMnAs/InAs p-n heterojunctions,” with
N. Rangaraju and B.W. Wessels, Journal of Vacuum Science & Technology
B, 26 4, 1526-1529 (2008).
“Structural and Magnetic Properties of Ferromagnetic In1-xMnxAs1-yPy
layers,” with N. D. Parashar, P. T. Chiu, and B. W. Wessels, Journal
of Magnetism and Magnetic Materials, 321 8, 1058-1062 (2009).
“Reflectance Magnetic Circular Dichroism Studies at the point in InMnAs
Semiconductor Films” with N.D. Parashar, P.T. Chiu, and B.W. Wessels,
Physica E, 41 7, 1147-1150 (2009).
“Giant magnetoresistance of magnetic semiconductor heterojunctions,” with
N. Rangaraju, Pengcheng Li, and B.W. Wessels, Phys. Rev. B, 79 20, 205209 (2009).
“Electronic structure of substitutional Mn in epitaxial In0.965Mn0.035Sb
film,” N.D. Parashar, D.J. Keavney and B.W. Wessels, Appl. Phys. Lett.
95 20, 201905 (2009).
“InMnAs Thin Films and Heterostructures,” by Bruce W. Wessels,
in Handbook of Spintronic Semiconductors (World Scientific 2010).
“High temperature ferromagnetism in epitaxial (In,Mn)Sb films,” with
N.D. Parashar, V.K. Lazarov, S. Xie and B.W. Wessels, Phys. Rev B, 81 11 115321
(2010).
“Magnetoresistance of InMnAs magnetic semiconductors,” with J.A. Peters and B.W. Wessels, Physica E, 42 5 1447-1450 (2010).
“Time resolved spectroscopy of InMnAs using differential transmission technique in mid-infrared,” with M. Bhowmick, T.R. Merritt, K. Nontapot, B.W. Wessels, O. Drachenko, G.A. Khodaparast, Physics Procedia 3 1167-1170 (2010).
“Magnetotransport properties if InMnSb magnetic semiconductor thin films,” with J.A. Peters, N.D. Parashar, N. Rangaraju, and B.W. Wessels, Phys. Rev B, 82 20 205207 (2010).
“Magnetoamplification in a Bipolar Magnetic Junction Transistor,” with N. Rangaraju, J.A. Peters, B.W. Wessels, Physical Review Letters, 105 11 117202 (2010).
“Spin-dependent magnetotransport in a p-InMnSb/n-InSb magnetic semiconductor heterojunction,” with J. A. Peters, N. Rangaraju, C. Feeser and B. W. Wessels, Appl. Phys. Lett., 98 19 193506 (2011).