Current and Former Ph.D. Students in The Research Group
 
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Dr. Steve Jacobs Biographies:

Institute of Optics

 
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Current Ph.D. Students and Selected Publications

 

 

 

 

 

 

Horton Fellow Sivan Salzman is a PhD candidate in the Materials Science Program. Her dissertation research is directed toward understanding the surface science issues affecting precision polishing of polycrystalline zinc sulfide (ZnS) using the magnetorheological finishing (MRF) process . Her work is based upon the formulation and characteriztion of surfactant-stabilized, acidic Magnetorheological (MR) slurries incorporating magnetic carbonyl iron (CI) particles that have been coated with a thin shell of zirconia.

The SEM image above shows cross-sections of CI particles with the zirconia coating (scale bar, 200-nm). This coating inhibits corrosion, offering the possibility for stable MRF processing at low pH.

Recent Publications and Presentations:

 

S. Salzman, H. J. Romanofsky, Y. I. Clara, L. J. Giannechini, G. West, J. C. Lambropoulos, and S. D. Jacobs "Magnetorheological finishing with chemically modified fluids for studying material removal of single-crystal ZnS," OPTIFAB 2013, edited by J. Bentley, M. Pfaff, Proc. SPIE vol. 8884, 8884071-15.

 

Sivan Salzman and Karan Mehrotra, "Structure of sol-gel derived nanozirconia-coated carbonyl iron (CI) particles used in magnegtorheological finishing (MRF)," Nanomaterials Symposium-Rochester Advanced Materials Program, University of Rochester (May 23, 2011).

 

S. N. Shafrir, H. J. Romanofsky, M. D. Skarlinski, M. Wang, C. Miao, S. Salzman, T. Chartier, J. Mici, J. C. Lambropoulos, R. Shen, H. Yang, and S. D. Jacobs, “Corrosion Resistant Zirconia Coated Carbonyl Iron Particle-Based Magnetorheological Fluid," in International Optical Design Conference (IODC)/Optical Fabrication and Testing (OF&T) Technical Digest on CD-ROM (Optical Society of America, Washington, DC, 2010), Paper OWB2.

 

 

 

   

Horton Fellow Debra Saulnier is a PhD candidate in the Chemical Engineering Department. Her dissertation research is directed toward the design, modeling, fabrication and testing of near uv-compatible chiroptial polarization rotators for large fusion lasers. Initial work using low molar mass lc fluids will be extended to glassy lc moieties in an attempt to move away from sealed sandwich cells to single substrate elements with potential for scalabilty to 400-mm diameters.

     
   

 

 

The map to the left shows cycles of optical rotatory power measured across the surface of a cholesteric liquid crystal element. The data were taken in the UV at a wavelength of 355-nm with a Hinds Instruments Mueller Matrix Polarimeter.

     

Recent Publications and Presentations:

 

D. Saulnier, B. Taylor, K. L. Marshall, T. Kessler, and S. D. Jacobs, "Liquid Crystal Chiroptical Polarization Rotators for the Near UV Region: Theory, Materials, and Device Applications,"(invited) SPIE Conference 8828: Liquid Crystals XVII, Annual Meeting, San Diego, CA 08-25-2013.

 

 

 

Horton Fellow Karan Mehrotra is a PhD candidate in the Mechanical Engineering Department. His advisor is Professor John Lambropoulos. Mr. Mehrotra's dissertation research is directed toward understanding the mechanical properties of nano-and micro-structures through advanced SEM techniques and nanoindentation testing. Subjects include "blister" artifacts introduced into the surfaces of multilayer dielectric thin film coatings through aggressive cleaning. By using a focused ion beam to etch into the side of a blister, the uplifting from formation of this artifact (see below) is shown to penetrate deeply into the MLD. (scale bar: 2-microns).

Recent Publications and Presentations:

K. Mehrotra, H. P. Howard, S. D. Jacobs and J. C. Lambropoulos, “Nanoindentation probing of high-aspect ratio pillar structures on optical multilayer dielectric diffraction gratings.” MRS Proceedings, 1474, mrss12-1474-ccc08-13 doi:10.1557/opl.2012.1353.

 

K. Mehrotra, H. P. Howard, S. D. Jacobs, and J. C. Lambropoulos, “Mechanical Characterization of ‘Blister’ Defects on Optical Oxide Multilayers Using Nanoindentation,” Nanocomposites, Nanostructures and Heterostructures of Correlated Oxide Systems, edited by T. Endo, H. Nishikawa, N. Iwata, A. Bhattacharya, and L. W. Martin, Mat. Res. Soc. Symp. Proc. Vol. 1454 (Cambridge University Press, Cambridge, England, 2012), pp. 215–220.

 

H. P. Howard, J. C. Lambropoulos and S. D. Jacobs, "Dependence of Thermal Stresses on Substrate Thickness During Wet Processing of Large Coated Optics." Technical Digest, Optical Society of America Topical Meeting on Optical Fabrication and Testing, Monterey, CA, 25-28 June 2012.

 

J.C. Lambropoulos, K. Mehrotra, H. P. Howard, and S. D. Jacobs, “Glass Ductility and Fracture at the 50- to 100-nm Scale.”   Technical Digest, Optical Society of America Topical Meeting on Optical Fabrication and Testing, Monterey, CA, 25-28 June 2012.

Karan Mehrotra, "Nanoindentation of HIgh-Aspect Ratio Patterned Silica Walls," Gordon Research Conference Seminar, Waterville, ME, (July 22, 2012).

 

K. Mehrotra, H. P. Howard, S. D. Jacobs, and J. C. Lambropoulos, “Nanoindentation of High-Aspect Ratio Pillar Structures on Optical Multilayer Dielectric Diffraction Gratings," AIP Adv. 1 (4), 042179 (2011).

 

 

U of R Sproull Fellow and LLE Horton Fellow Kaitlin Wozniak is a PhD candidate in The Institute of Optics. Her dissertation research concerns photo- alignment of nematic liquid crystals at surfaces, anchoring strength, and optically addressable spatial light modulators for lasers.

The above image is extracted from K. L. Marshall, et al., "Liquid crystal near-IR laser beam shapers employing photoaddressable alignment layers for high-peak-power applications," (invited) SPIE Conference 8828: Liquid Crystals XVII, Annual Meeting, San Diego, CA 08-25-2013 (to be published).


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Former Ph.D. Students and Selected Publications

 

Grating inspection with Nomarski microscopy

SEM image of grating pillars etched into silica on top of an MLD.

Horton Fellow Heather Howard Liddell successfully defended her Ph.D. dissertation in the Materials Science Program on Decembrer 12, 2013. Her dissertation research was directed toward understanding the surface science issues affecting precision cleaning of mutilayer dielectric (MLD) thin film diffraction gratings used to compress 1054-nm laser pulses generated in the OMEGA EP laser system.

 

Shown above are "blister" artifacts created in the MLD from aggressive cleaning at elevated temperatures in piranha (a mixture of sulfuric acid and hydrogen peroxide).

Recent Publications and Presentations:

 

H. P. H. Liddell, "Enhancing the Performance of Multilayer-Dielectric Diffraction Gratings Through Cleaning Process Modifications and Deect Mitigation," Ph.D. dissertation in the Program of Materials Science, Edmund A. Hajim School of Engineering and Applied Science. December 12, 2013.

 

H. P. H. Liddell, K. Mehrotra, L. C. Lambropoulos, and S. D. Jacobs,"Fracture mechanics of delamination defects in multilayer dielectric coatings," Appl. Opt. 52, 7689-7698 (Nov. 2013)

 

H. P. Howard, A. F. Alieo, J. G. Dressler, N. R Edwards, T. J. Kessler, A. A. Kozlov, I. R. T. Manwaring, K. L. Marshall, J. B. Oliver, S. Papernov, A. L. Rigatti, A. N. Roux, A. W. Schmid, N. P. Slaney, C. C. Smith, B. N. Taylor, and S. D. Jacobs, "Improving the performance of high-laser-damage-threshold, multilayer dielectric pulse-compression gratings through low-temperature chemical cleaning," Appl. Opt. 52, 1682-1692 (March 2013)

 

H. P. Howard, "Enhancement of the Laser-Induced-Damage Threshold in Multilayer Dielectric Diffraction Gratings Through Targeted Chemical Cleaning," LLE Review 131, pp. 149-158 (2012).

 

(Invited) H. P. Howard, "An improved cleaning method to enhance the damage threshold of multilayer dielectric (MLD) Gratings," paper W2-1, International Conference on Ultrahigh Intensity Lasers (ICUIL), Mamaia, Romania (September, 2012).

 

Heather P. Howard, John C. Lambropoulos and Stephen D. Jacobs, "Dependence of Thermal Stresses on Substrate Thickness During Wet Processing of Large Coated Optics," OSA Topical Meeting on Optical Fabrication and Testing (OF&T), Technical Digest CD, paper OW3D.3, Monterey, CA (June, 2012).

 

H. P. Howard, J. Cheng, P. T. Vianco and J.C. M. Li, "Interface flow mechanism for tin whisker growth," Acta Materialia 59, pp.1957-1963 (2011) .

 

 

Ms. Graciela Mohamedi obtained her MS in Chemical Engineering. Her thesis was entitled, "Microencapsulation of Polymer Cholesteric Liquid Crystal Flakes for Optical Display Applications." In her research Ms. Mohamedi developed polymer encapsulation methods using simple coacervation, interfacial polycondensation and interfacial polymerization. She is completing her Ph. D. at the Institute of Biomdical Engineering, Department of Engineering Science, University of Oxford, U. K., in the group of Prof. Eleanor Stride.

Recent Publications:

 

G. Mohamedi, M. Azmin, I. Pastoriza-Santos, V. Huang, J. Perez-Juste, L. M. Liz-Marzan, M. Edirisinghe, and E. Stride, "Effects of Gold Nanoparticles on the Stability of Microbubbles," Langmuir 2012, 28, 13808-13815.

 

 

LLE Engineer Henry Romanofsky assisting Chunlin Miao on the MRF spot taking machine

Horton Fellow Chunlin Miao successfully defended his PhD thesis on December 4, 2009 in the Materials Science Program. The title of his dissertation was "Frictional forces in material removal for glasses and ceramics using magnetorheological finishing." By measuring drag force in MRF for the first time, he was able to improve upon models of material removal. Dr. Miao works for JP Morgan Chase in Wilmington DE, on data mining and modeling.

 

Set of sample parts for spotting with MRF

Recent Publications and Presentations:

C. Miao, R. Shen, M. Wang, S. N. Shafrir, H. Yang, and S. D. Jacobs, “Rheology of Aqueous Magnetorheological Fluid Using Dual Oxide-Coated Carbonyl Iron Particles,” J. Am. Ceram. Soc. 94 (8), 2386–2392 (2011).

J. C. Lambropoulos, C. Miao, and S. D. Jacobs, “Magnetic Field Effects on Shear and Normal Stresses in Magnetorheological Finishing,” Opt. Express 18, 19,713–19,723 (2010).

 

C. Miao, S. N. Shafrir, J. C. Lambropoulos, J. Mici, and Stephen D. Jacobs, "Shear stress in magnetorheological finishing for glasses," Appl. Opt. 48, 2585-2594 (2009).

C. Miao, S. N. Shafrir, J. C. Lambropoulos and S. D. Jacobs, "Normal force in magnetorheologial finishing," SPIE Conference 7426: Optical Manufacturing andTesting VIII, San Diego, CA, Aug. 4-5, 2009 (CD) 7426-11.

C. Miao, J. C. Lambropoulos, S. N. Shafrir, H. J. Romanofsky and S. D. Jacobs, "Contributions of nanodiamond abrasives and deionized water in magnetorheological finishing of aluminum oxynitride," SPIE Conference 7426: Optical Manufacturing and Testing VIII, San Diego, CA, Aug. 4-5, 2009 (CD) 7426-12.

 

Horton Fellow Gerald Cox successfully defended his PhD thesis on December 9, 2009 in the Materials Science Program. The title of his dissertation was "Microencapsulation effects on the electro-optic behavior of polymer cholesteric liquid crystal flakes."

Dr. Cox used finite element modeling to derive the electric field acting on pclc flakes in various dielectric environments. These results were then put into a previously developed analytical model to predict reorientation times for flakes in AC electric fields. In the process of his research, Dr. Cox and a ChE senior, Kathy Fromen, discovered a reverse drive mechanism for switching.

 

PCLC flakes whose reflectivity may be turned on and off with an elecdtric field (U. S. Patent #8,293,135)

Recent Patents, Publications and Presentations:

 

Gerald P. Cox, Cathy A. Fromen, Kenneth L. Marshall and Stephen D. Jacobs,"PCLC flake-based apparatus and method," U. S.Patent #8,293,135 (issued October 27, 2012).

 

G. P. Cox, K. L. Marshall, J. C. Lambropoulos, M. Leitch, C. Fromen, and S. D. Jacobs, "Modeling the effects of microencapsulation on the electro-optic behavior of polymer cholesteric liquid crystal flakes," J. Appl. Phys.106, 124911 (2009).

 

Dr. Jessica DeGroote Nelson received her Ph.D. from The Institute of Optics at the University of Rochester in July, 2007. The title of her dissertation was "Surface Interactions Between Nanodiamonds and Glass in Magnetorheological Finishing (MRF)." Dr. Nelson developed an improved model for understanding material removal rates in MRF. In her work with Hoya phosphate laser glass LHG8, she discovered how highly sensitive this glass was to very small concentrations of nanodiamond abrasives. She also determined the effectiveness of nanodiamonds with different degrees of friability (resistance to crushing). The MRF model she developed is one of a very few that considers glass composition in predicting the removal rate.

Dr. Nelson is currently Manager of R & D at Optimax Systems, Inc., Ontario, NY.

Publications and Presentations:

J. E. DeGroote, A. E. Marino, J. P. Wilson, A. L. Bishop and S. D. Jacobs,"Removal rate model for Magnetorheological Finishing (MRF) of Glass," Applied Optics, 46, pp. 7927-7941 (2007).

J. E. DeGroote, A. E. Marino, J. P. Wilson, A. L. Bishop and S. D. Jacobs, "The role of nanodiamonds in the polishing zone during magnetorheological finishing," Proceedings of SPIE 6671: Optical Manufacturing and Testing VII, 6671Z-01-15 (2007).

Prof. Anka Trajkovska-Petkoska received her Ph.D. from the Department of Chemical Engineering of the University of Rochester in May 2007. The title of her dissertation was "Enhanced Electro-Optic Behavior of Polymer Cholesteric Liquid Crystal Flakes in Host Fluids." Dr. Trajkovska-Petkoska developed (US. Patent #7,238,316 B2, issued 7/3/07) a process for fabricating shaped pCLC flakes with soft lithography.Suspended in a dielectric fluid-filled cell, her doped flakes exhibited both translational and rotational motion under dc-field excitation.

Dr. Trajkovska-Petkoska is currently Associate Professor at the Faculty of Technology and Technical Sciences - Veles, University St. Clement Ohridski - Bitola, Republic of Macedonia; she is also Vice-Dean of Education.

Publications and Presentations:

A. Trajkovska Petkoska and S. D. Jacobs, “The Manufacture, Characterization and Manipulation of Polymer Cholesteric Liquid Crystal Flakes and Their Possible Applications,” J. Mater. Sci. Eng. A 2 (2), 137–151 (2012).

 

A. Trajkovska-Petkoska and S. D. Jacobs,“Effect of Different Dopants on Polymer Cholesteric Liquid Crystal Flakes,” Mol. Cryst. Liq. Cryst., 495, pp. 334-347 (2008)

A. Trajkovska Petkoska, T. Z. Kosc, K. L. Marshall, K. Hasman and S. D. Jacobs, "Motion of Doped-Polymer-Cholesteric Liquid Crystal Flakes in a Direct-Current Electric Field," J. Appl. Phys. 103, 094907 (2008)

A. Trajkovska-Petkoska, T. Z. Kosc, K. L. Marshall, and S. D. Jacobs, "Electro-optics of polymer cholesteric liquid crystal flakes: applications toward electronic paper," presented at the 9th European Conference on Liquid Crystals, Lisbon, Portugal, July 2, 2007.

 

shaped pCLC flakes manufactured with soft lithography

E-O switchable pCLC flake devices

A. Trajkovska-Petkoska, R. Varshneya, T. Z. Kosc, K. L. Marshall, and S. D. Jacobs, "Enhanced Electro-Optic Behavior for Shaped Polymer Cholesteric Liquid Crystal (PCLC) Flakes Made by Soft Lithography," Adv. Funct. Mater. 15, pp. 217-222 (Feb. 2005 - journal cover photo).

 

 

.Dr. Tanya Z. Kosc,Staff Scientist,

Laboratory for Laser Energetics

University of Rochester

 

"Motion of Polymer Cholesteric Liquid Crystal Flakes in an Electric Field"

Ph.D. Thesis, The Institute of Optics, University of Rochester, June 2003

 

Selected Publications:

 

T. Z. Kosc, K. L. Marshall, S. D. Jacobs and J. C. Lambropoulos, "Polymer cholesteric liquid-crystal flake reorientation in an alternating current electric field," J. Appl. Phys. 98, 013509 (2005).

 

T. Z. Kosc, "Particle Display Technologies Become E- Paper," Optics & Photonics News, 18-23, (February 2005)

T. Z. Kosc, K. L. Marshall, A. Trajkovska-Petkoska, E. Kimball and S. D. Jacobs, "Progress in the development of polymer cholesteric liquid crystal flakes for display applications," Displays 25 (2004) 171-176.

T. Z. Kosc, K. L. Marshall, A. Trajkovska-Petkoska, R. Varshneya and S. D. Jacobs, "Development of Polymer Cholesteric Liquid Crystal Flakes for Electro-Optics Applications," Optics & Photonics News, 33 (December 2004).

 

T. Z. Kosc, K. L. Marshall, S. D. Jacobs, J. C. Lambropoulos and S. M. Faris, "Electric-field-induced motion of polymer cholesteric liquid-crystal flakes in a moderately conductive fluid," Appl. Opt. 41, 5362-5366 (2002).

 

 

Aric Shorey

 

Dr. Aric B. Shorey, Project Engineer

Corning, Inc.,Corning, NY


“Mechanisms of Material Removal in MRF of Glass”
Ph.D. Thesis, Materials Science, University of Rochester, May 2000

Selected Publications:

A. B. Shorey, S. D. Jacobs, W. I. Kordonski, R. F. Gans, “Experiments and Observations Regarding the Mechanisms of Glass Removal in Magnetorheological Finishing,” Appl. Opt. 40, 20–33 (2001).

A. B. Shorey, K. M. Kwong, K. M. Johnson, and S. D. Jacobs “Nanoindentation Hardness of Particles Used in Magnetorheological Finishing (MRF),” Appl. Opt. 39, 5194–5204 (2000).

A. B. Shorey, W. I. Kordonski, S. R. Gorodkin, S. D. Jacobs, R. F. Gans, K. M. Kwong, and C. H. Farny, “Design and Testing of a New Magnetorheometer,” Rev. Sci. Instrum. 70, 4200–4206 (1999).

 

 

Prof. Eileen Korenic, Dept. of Physics and Astronomy, Univ. of Wisconsin, River Falls
“Colorimetry of Liquid Crystals”
Ph.D. Thesis, The Institute of Optics, University of Rochester, June 1997

On 19 June 1998, Eileen Korenic was awarded the Glenn H. Brown Prize by the International Liquid Crystal Society for the most outstanding Ph.D. thesis on liquid crystals written in the USA since 1994.

Selected Publications:

E. M. Korenic, S. D. Jacobs, S. M. Faris, and L. Li, “Cholesteric Liquid Crystal Transmission Profile Asymmetry,” Mol. Cryst. Liq. Cryst. 317, 221–235 (1998).

E. M. Korenic, S. D. Jacobs, S. M. Faris, and L. Li, “Cholesteric Liquid Crystal Flakes—A New Form of Domain,” Mol. Cryst. Liq. Cryst. 317, 197–219 (1998).

E. M. Korenic, S. D. Jacobs, S. M. Faris, and L. Li, “Color Gamut of Cholesteric Liquid Crystal Films and Flakes by Standard Colorimetry,” Color Res. Appl. 23, 210–220 (1998).

 

 

Dr. Michael J. Cumbo, Founder and CEO of Sandia Electro-Optics Corporation (SE-OC), Albuquerque, New Mexico.

www.se-oc.com


“Chemo-Mechanical Interactions in Optical Polishing”
Ph.D. Thesis, The Institute of Optics, University of Rochester, May 1993

Selected Publications:

M. J. Cumbo, D. Fairhurst, S. D. Jacobs, and B. E. Puchebner, “Slurry Particle Size Evolution During the Polishing of Optical Glass,” Appl. Opt. 34, 3743–3755 (1995).

M. J. Cumbo and S. D. Jacobs, “Determination of Near-Surface Forces in Optical Polishing Using Atomic Force Microscopy,” Nanotechnology 5, 70–79 (1994).

Jae Cheul Lee

 

 

Dr. Jae Cheul Lee, - Vice President, Hanwha Corp.,Daejeon, South Korea.
“Applications of Cholesteric Liquid Crystal in Laser Resonators and Amplifiers”
Ph.D. Thesis, The Institute of Optics, University of Rochester, May 1990

Selected Publications:

J. C. Lee, S. D. Jacobs, and K. J. Skerrett, “Laser Beam Apodizer Utilizing Gradient-Index Optical Effects in Liquid Crystals," Opt. Eng. 30, 330–336 (1991).

J. C. Lee and S. D. Jacobs, “Design and Construction of 1064-nm Liquid-Crystal Laser Cavity End Mirrors,” J. Appl. Phys. 68, 6523–6525 (1990).

J. C. Lee, S. D. Jacobs, T. Gunderman, A. Schmid, T. J. Kessler, and M. D. Skeldon, “TEM00-Mode and Single-Longitudinal-Mode Laser Operation with a Cholesteric Liquid-Crystal Laser End Mirror,” Opt. Lett. 15, 959–961 (1990).

 

Mike Cumbo and Jae-Cheul Lee meet in Korea (2012)

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