Wheaton College Norton, Massachusetts
Wheaton College
Faculty

Academics

John Michael Collins

John Michael Collins

Professor of Physics
Chair, Astronomy and Physics
Degrees

Ph.D. and M.A. in Physics, Boston College
B.A. in Physics, College of the Holy Cross

Main Interests

Physics, especially the interaction of radiation with matter; the role of science in society; politics; sports (basketball, bicycling, golf); family,

Research Interests

Luminescence Spectroscopy of Solids: There is an ongoing effort, in collaboration with a group at Boston College, to investigate the luminescent properties of solid state laser materials, particularly rare earth ion- and transition metal ion-doped insulators. These materials are used for several applications, the most prominent being fluorescent lamp phosphors, laser, display screens (for televisions, computers, etc.). After absorbing energy, the material may emit light that is characteristic of the atoms that make up the solid, though often all or part of the energy is converted into heat. We investigate the processes that take place following the absorption of light. These processes include multiphonon decay, energy transfer, upconversion, radiative decay, and vibronic processes.

This year our efforts are focused in the following areas:

  • The properties of oxides materials with metal-metal charge transfer states for potential application in solid state lighting devices
  • An investigation into rare-earth ion doped phosphors for use in medical imaging systems
  • Luminescent properties of nanoparticles doped with rare earth and transition metal ions. The role of surface states and confinement effects are of primary interest
  • Upconversion processes as a tool in site-selective spectrascopy.
  • Construction of virtual crystals on the computer, and the modeling of energy transfer processes for various crystals, doping levels, and chemical parameters.

In recent years, I have had the pleasure of assisting in the organization of the International School of Atomic and Molecular Spectroscopy. These schools and workshops meet in Erice, Sicily during the summers. The topics cover the physics of optical materials, with the most recent workshop (2012) on "New Developments in Inorganic Luminescent Materials . For more information on the Erice summer schools, go to: http://www.physics.bc.edu/fac/research/dibartolo/Erice/Default.htm.

Collaborators and Support

  • National Science Foundation: (Award number CHE-1126337)"MRI: Acquisition of a Pulsed Laser/Detection System for Time-Resolved Studies of Molecular Complexes". This is a 3-year award beginning August, 2011 in the amount of $255,865.
  • National Science Foundation: (Award number DMR-1105907) "RUI: Investigation of Metal-to-Metal Charge Transfer States in Rare Earth Ion-Doped Solids". This is a three year grant beginning September, 2011 in the amount of $264,776.
  • General Electric Center for Global Research, Niskayuna NY
  • OSRAM Sylvania Lighting Research Center, Beverly MA
  • Boston College Spectroscopy Lab, Chestnut Hill, MA

 

Teaching Interests

I enjoy teaching Physics at all levels. My most recent teaching interest is in transforming the Introductory Physics courses from a lecture-based course to a combined lab/lecture format. This new format provides students with the opportunity to gain immediate insights, through experimentation, of the material being presented in class. The format seeks to have students actively engaged in learning for the entire class, and is based on the TEAL teaching format developed in part at MIT.

As an experimental physicist, I am especially interested in providing students with meaningful laboratory experiences, from the introductory course to the senior thesis projects.

Courses taught include Introductory Physics I and II, Modern Physics I and II, Optics, Classical Mechanics, Electricity and Magnetism, Statistical Physics, Quantum Physics, Experimental Physics, The Physics of Music and Sound, and Electronic Circuits.

Recent Publications

H. Örücü, G. Özen, B. Di Bartolo and J. Collins, "Site-Selective Spectroscopy of Garnet Crystals Doped with Chromium", J. Physical Chemistry A 115, 8815-8826 (2012). dx.doi.org/10.1021/jp3022584

J. Collins, "Principles and Applications of Rare Earth Ion-Doped Nanoparticles" Proceedings of the course on "Nano-Optics for Enhancing Light-Matter Interactions on a Molecular Scale: Plasmonics, Photonic Crystals, Metamaterials and Sub-Wavelength Resolution", NATO Science for Peace Series B: Physics and Biophotonics, ed. B. Bi Bartolo and J. Collins (Springer , The Netherlands) to be published, 2012

A. Srivastava, M. Jennings, and J. Collins, "The Interconfigurational (4f15d1 to 4f2) Luminescence of Pr3+ in LuPO4, K3Lu(PO4)2 and LiLuSiO4", Optical Materials 34, 8,  ( 2012) 1347-1352.

J. Collins, M. Geen, B. Di Bartolo, and M. Bettinelli, Thermal and Concentration Dependence of Cross-Relaxation in Pr-doped YPO4, Journal of Luminescence 132, 10 2626–2633 (2012). http://dx.doi.org/10.1016/j.jlumin.2012.04.027

B. Di Bartolo and J. Collins, "Principles of of Photoluminescence", Chapter 1 in Handbook of Luminescent Semiconductor Materials, eds. L. Bergman and J. McHale, Taylor and Francis Inc., published, September 2011.

J. Collins, M. Bettinelli, B. Di Bartolo, "Luminescence and Decay Properties of the 1D2 Level of Pr3+-doped YPO4", Canadian Journal of Chemistry, 2011, 89:415-422, 10.1139/V11-012

H. Orucu, J. Collins, B. Di Bartolo, "Photoluminescence Spectroscopy of Cr3+ in CaY2Mg2Ge3O12", Journal of Applied Physics, 108 (10) art. no. 103101.

J. Collins and B. Di Bartolo, co-editors of Biophotonics: Spectroscopy, Imaging, Sensing, and Manipulation, NATO Science for Peace and Security Series B:, Physics and Biophysics (Springer, 2010).

J. Collins, "Two-Photon Spectroscopy and Applications to Rare Earth Ions and Biological Molecules", in "Biophotonics: Spectroscopy, Imaging, Sensing, and Manipulation, NATO Science for Peace and Security Series B:, Physics and Biophysics (Springer, 2010).

H. Orucu, G. Özen, J. Collins, and B. Di Bartolo, "Temperature Dependence of the Luminescence Spectra of Garnet Crystals Doped with Chromium Ions", Optical Materials, 31 7 1065-1070 (2009).

W. Wall, B. Di Bartolo, J. Collins, and H. Orucu, " Vibrational Assisted Transitions and Phonon Spectra in Crystalline Solids", J. Luminescence 129 12, 1782-1785 (2009).

G. Ozen, J. Collins, B. Di Bartolo, and O Forte, " Up-conversion as a Discriminating Tool in Site-Selective Spectroscopy in Pr-doped Y3Al5O12", Journal of Applied Physics, 102, 023110 (2007) (8 pages) .

G. Ozen, O. Forte, B. Di Bartolo and J. Collins, "Dynamics of the Excitation and Up-conversion Processes in doped YAlO3:Pr Single Crystals", J. Luminescence 125 1-2, 223-229 (2007)


Recent Conference Presentations

G. Bilir, G. Ozen, B. Di Bartolo, and J. Collins, "Synthesis and Spectroscopy of Nanoscale Y2O3:Nd3+ Phosphors", Meeting of the Electrochemical Society, Honolulu, Hawaii, October 7-12, 2012.

J. Collins, Y. Tsehay, J. Long, P. Boutinaud,  R. Boonsin, G. Chadeyron, "Spectroscopy of Pr-doped CaTiO3 under UV excitation",  Meeting of the Electrochemical Society, Honolulu, Hawaii, October 7-12, 2012. (Yohannes Tsehay and Judy Long are Wheaton class of 2014.)

T. Bennett and J. Collins, "Luminescence Properties of Pr-Doped Lithium Niobate", Northeast Undergraduate Research and Development Symposium (NURDS) at the University of New England in Biddeford, ME, March 10-11, 2012. (Tyler Bennett is Wheaton Class of 2012.)

 J. Collins, M. Bettinelli, P. Boutinaud, M. Geen, B. Di Bartolo, and J. García Sole, "Relaxation via the Intervalence Charge Transfer (IVCT) State in Pr3+-Doped LiNbO3: A Kinetic Approach, to be presented at the International Conference on Luminescence, June 26 - July 1, 2011.

 A. M. Srivastava, S. J. Camardello, H. A. Comanzo and J. Collins, "Synthesis, Crystal Structure and Luminescence of Rare Earth Ions in New Borates, KBaRE(BO3)2 (RE=SC3+, Lu3+, Y3+, Gd3+)", presented at the International Conference on Luminescence, June 26-July 1, 2011.

 J. Collins, "Principles and Applications of Rare Earth Ion-Doped Nanoparticles" at the International School of Atomic and molecular Spectroscopy, Course on Nano-Optics for Enhancing Light-Matter Interactions on a Molecular Scale: Plasmonics, Photonic Crystals, Metamaterials and Sub-Wavelength Resolution, July 2-16, 2011, Erice, Sicily, Italy.

G. Ozen, B. Di Bartolo, J. Collins, Marco Bettinelli, "The Effect of Particle Size and Concentration on the Luminescence of Cr-doped YAG Nanoparticles", presented at the Meeting of the Electrochemical Society, October 2011.

J. Collins, G, Ozen, M. Bettinelli, and B. Di Bartolo, "Kinetic Studies of Luminescence from of Pr-doped CaNbO3", presented at the Meeting of the Electrochemical Society, October 2011.

A. M. Srivastava, S. J. Camardello, H. A. Comanzo, F. Garcia-Santamaria and J. Collins, "Luminescence Energy Losses from Borates containing Cerium and Praseodymium", at the Meeting of the Electrochemical Society, October 2011.

H. Orucu, G. Ozen, J. Collins, and B. Di Bartolo, “Site-Selective Spectroscopy of Cr- and Pr-doped Garnets” presented at Optical Society of America, Istanbul, Turkey, February 2010.

J. Collins, M. Bettinelli, B. Di Bartolo, “Luminescence Spectroscopy of the 1D2 Level of Pr3+-doped YPO4", presented at the Meeting of the Electrochemical Society, Las Vegas, NV, October 2010.

J. Collins, “The Decay of the 1D2 Level in Pr-doped YPO4”,  Luminescence of Inorganic Materials and Bioimaging: Metal-to-Metal Energy and Electron Transfer, Workshop of the International School on Atomic and Molecular Spectroscopy, Eice, Sicily, Italy, June 2010.

J. Collins, M. Bettinelli, B.Di Bartolo, "Decay of the 1D2 levels of Pr:YPO4", presented at the Meeting of the Electrochemical Society, Las Vegas, NV, October 10 - 15, 2010.

J. Collins, M. Bettinelli, B.Di Bartolo, "Luminescence Spectroscopy and Dynamics of Pr-doped YPO4", Meeting of the Electrochemical Society, Vienna, Austria, October 6 - 10, 2009.

J. Collins, J. Grassetti, K Mishra, D. Hamby, J. McKittrick, J. Tao, S. Shimizu, J Talbot, and B. Di Bartolo, Structural And Optical Properties of ZnO-based Alloys, presented at the Meeting of the Electrochemical Society, Honolulu, HI, October, 2008. published in ECS Transactions, December, 2008.

J. Collins, M. Jennings, J. S. Vartuli, S. J. Duclos, and A. Srivastava, "Luminescence of Pr3+ in LuPO4", presented at the International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, Lyon, France, July, 2008.

W. Wall, B. Di Bartolo, J. Collins, and H. Orucu, " Vibrational Assisted Transitions and Phonon Spectra in Crystalline Solids", presented at the International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, Lyon, France, 2008.

J. Collins, H. Orucu, and B. Di Bartolo, On the Spectral Behavior of Cr-doped Garnets," presented at the International School of Atomic and Molecular Spectroscopy Workshop on "Advances in Luminescence Spectroscopy, June 21-27, 2008, Erice-Sicily.

B. Di Bartolo and J. Collins, "Thermal Effects on the Spectral Characteristics of Laser Solids", in "Frontier Developments in Optics and Spectroscopy" the Proceedings of the International School of Atomic and Molecular Spectroscopy, Erice, Italy, June 2007. Available on web at: http://www.physics.bc.edu/Fac/Research/dibartolo/books/

H. Orucu, G. Ozen, J. Collins and B. Di Bartolo, "Temperature Dependence of the Luminescence Spectra of Garnet Crystals Doped with Chromium Ions, presented at the International Workshop on Photonic Materials, Donostia (San Sebastian, Spain), July 4-6, 2007.

H. Orucu, G. Ozen, J. Collins and B. Di Bartolo, "Wide Band Luminescent Emitters: The Case of YAG:Cr" , presented at the Fall Meeting of the Electrochemical Society, Washington DC, October 2007.

J. Collins, "Luminescence as Materials Science", two lectures given at summer school on "Frontier Developments in Optics and Spectroscopy" at the International School of Atomic and Molecular Spectroscopy, Erice, Italy, June 2007.

N. apRoberts Warren, J. Collins, R. Wall, B. Di Bartolo, "Theoretical Studies of Vibronic Transitions of Optically Active Centers in Crystals", presented at the Spring Meeting of the New England Section of the American Physical Society, Orono, ME, April 2007.

J. Tolson, J. Collins, B. Di Bartolo, "Cross-Relaxation and Diffusion of Energy in Pr-doped Yttrium Silicate", presented at the Spring Meeting of the New England Section of the American Physical Society, Orono, ME, April 2007.

C. Stuetzle, J. Collins, and M. Gousie, "Stochastic Modeling of Decay Processes in Crystals with Random and non-Random Placement of Ions", presented at the Spring Meeting of the New England Section of the American Physical Society, Orono, ME, April 2007.

J. M. Collins, B. Di Bartolo and J. Tolson, "Spectroscopy and Kinetic Studies of Pr-Doped Yttrium Silicate", Proceedings of the 210th Meeting of the Electrochemical Society, Cancun, Mexico, October 29- November 3, 2006.

J. Collins, G. Ozen, B. Di Bartolo, and O Forte, "Up-conversion at different sites in Pr-doped Y3Al5O12", presented at the International Conference on Luminescence, J. Luminescence 122-123, 447-449 (2006).

J. Tudisco and J. Collins, "Graphical and Statistical Modeling of a Doped Yttrium Aluminum Garnet (Y3Al2(AlO4)3 ) Crystal", presented at the Consortium for Computing Sciences in Colleges, Northeast Region, April 21-22, 2006, Worcester, MA.

J. Tudisco and J. Collins, "Random and Non-random Distributions of Rare Earth Ions in Yttrium Aluminum Garnet (Y3Al2(AlO4)3) Crystal", presented at the Meeting of the American Physical Society, New England Section, March 31 - April 1, 2006 Boston, MA.

J. Collins, G. Ozen, and B. Di Bartolo, "Vibronic Studies of Optical Centers in YAG", presented at the Meeting of the Electrochemical Society, Los Angeles, October 2005.

Student Projects

Some student theses:

Alex Shvonski (08) Time Series Analysis of the Optical and Radio Variability of BL LAC
Jessical Tolson (07) Energy Transfer Processes in Yttrium Silicate
Nick apRoberts-Warren (07) Group Theoretical Techniques in Analyzing Vibronic Transitions in Doped Crystals
Chris Steutzle (07) Computer Modeling and Visualization of Luminescent Crystals: The Role of Energy Transfer Upconversion
Jon McBee (04) Modeling of Delta Scudi Pulsating Stars
Ken Bycenski (01) Power and Temperature Dependence of Non-Radiative Decay in Er:Glass
B.J. Hansz (99) Coherent Transient Laser Spectroscopy: Light Shifts of Rare-Earth Ions in Solids
Jessica Krick (99) Two Stars Passing in the Night: An Analysis of Eclipsing Binary Systems
Adam Petri (98) Thermal Effects on Upconversion Dynamics of Er in YLF4 and Fluoride Glass
Jim Phillips (98) Construction and Characterization of a Q-Switched Nd:YAG Laser
Tara Healey (96) Theoretical and Experimental Investigations of Solid State Laser Systems