State University of New York at Binghamton

Ph.D Physics (Nonlinear Optics) - Dr. Bonggu Shim's Femtosecond Laser Spectroscopy Lab

Aug 2014 – Dec 2018

▸ GPA of 3.95/4.000

▸ Investigated experimental methods to control and characterize ultrafast nonlinear events:

◦ Laser filamentation in solids and gases, inhibition of stochastic multi-filamentation, solitary wave generation.

◦ Two-color femtosecond-time-resolved pump-probe experiments of harmonic generation in air.

◦ Femtosecond-laser-written waveguide fabrication in flexible Corning® Willow® glass.

◦ Second-harmonic generation polarimetry for crystal structure characterization of novel multiferroics (BiFeO₃).

▸ Developed visualization tools for measuring ultrafast nonlinear events:

◦ Digital in-line holography and associated numerical reconstruction algorithm for femtosecond time-resolved measurements of plasma density generated by laser filamentation

◦ Single-shot Michelson interferometry for measurements of refractive index evolution during femtosecond laser-written waveguide fabrication

◦ Tomographic interferometry for extracting 3D refractive index profiles of waveguides and optical fibers.

◦ Frequency-domain holography for single-shot measurements of nonlinear laser-matter interactions.

▸ Modeled nonlinear laser pulse propagation by solving unidirectional pulse propagation equation (UPPE):

◦ Corroborated experimental work on harmonic generation and laser filamentation

◦ Confirmed experimental work of collaborators on mid-infrared filamentation in solids and gases.

◦ Published a theoretical manuscript on light bullet generation in solids in the long-wavelength infrared

B.S. Mathematical Physics | B.S. Integrative Neuroscience

Aug 2010 – May 2014

▸ GPA of 3.91/4.000 (Summa Cum Laude)

▸ Evolutionary Biology minor

▸ Undergraduate Research Assistant for Dr. Charles Nelson

◦ Theoretically investigated empirical absence of particles obeying parastatistics in high-energy collider experiments.

◦ Analyzed paraparticle processes using supersymmetric-like “statistics portal” Lagrangian and associated tree diagrams.

▸ Undergraduate Research Assistant for Dr. Michael Nizhnikov

◦ Studied the effects of prenatal alcohol exposure on rat behavior and brain development.

◦ Applied daily intragastric administrations of ethanol to pregnant rat dams

◦ Analyzed kappa opioid receptor expression in mesolimbic brain regions of rat pups using Western Blot.

Onto Innovation, Hillsboro OR

Senior Systems Engineer

Jan 2019 – Present

▸ Design, develop and build optical metrology devices for the semiconductor industry.

▸ On-site customer install.

American Environments Company Incorporated, Medford NY

Electromagnetic Interference (EMI) Test Engineer

Apr 2014 – Aug 2014

▸ Tested radiated/conducted emissions/susceptibility against common standards (e.g.: MIL-STD-461, EN 50081, etc.

▸ Performed regular maintenance, calibration and troubleshooting on EMI units, including scalar network analyzers, spectrum analyzers and line impedance stabilization networks.

Award for Excellence in Research

Binghamton University

Mar 2018

▸ Honors important contributions that graduate students make to research at the University and the approaches they take to the advancement of knowledge. Awards are given once a year to 10 – 15 graduate students (out of over 2000).

Semiconductor Packaging Best Oral Presentation Award

The International Microelectronics Assembly and Packaging Society (IMAPS)

Jun 2017

▸ My research talk, titled “Fabrication and characterization of femtosecond laser-written waveguides in flexible glass”, was chosen as the best student oral presentation at the 2017 IMAPS conference (scholarship provided).

George E. Moore Award for Academic Excellence in Physics

Binghamton University Department of Physics, Applied Physics, and Astronomy

May 2014

▸ This award is given to a senior undergraduate student for his or her excellent academic achievement. It is a cash prize and is presented at the end of the spring semester (scholarship provided).

Scientific Journals

▸ R. I. Grynko, G. C. Nagar, J. Young, C. Orlik, D. Dempsey, M. Smeu, B. Shim and I.-T. Bae, “Structural probing of BiFeO₃ via second-harmonic generation,” in preparation (2018).

▸ R. I. Grynko, G. C. Nagar, and B. Shim, “Wavelength-scaled laser filamentation in solids and plasma-assisted sub-cycle light bullet generation in the long-wavelength infrared,” Phys. Rev. A 98, 023844 (2018).

▸ R. I. Grynko, D. L. Weerawarne, and B. Shim, “Effects of higher-order nonlinear processes on harmonic-generation phase matching,” Phys. Rev. A 96, 013816 (2017).

▸ R. I. Grynko, D. L. Weerawarne, X. Gao, H. Liang, H. J. Meyer, K.-H. Hong, A. L. Gaeta, and B. Shim, “Inhibition of multi-filamentation of high-power laser beams,” Opt. Lett. 41, 4064 (2016).

▸ H. Liang, D. L. Weerawarne, P. Krogen, R. I. Grynko, C.-J. Lai, B. Shim, F. X. Kärtner, and K.-H. Hong, “Mid-infrared laser filaments in air at a kilohertz repetition rate,” Optica 3, 678 (2016).

▸ H. Liang, P. Krogen, R. Grynko, O. Novak, C.-L. Chang, G. J. Stein, D. Weerawarne, B. Shim, F. X. Kärtner, and K.-H. Hong, “Three-octave-spanning supercontinuum generation and sub-two-cycle self-compression of mid-infrared filaments in dielectrics,” Opt. Lett. 40 (6), 1069 (2015).

Conference Papers

▸ R. I. Grynko, G. C. Nagar, and B. Shim, “Sub-cycle light bullets in the long-wavelength infrared,” in CLEO: 2018, OSA Technical Digest (online) (Optical Society of America, 2018), paper JTu2A.132

▸ R. I. Grynko, D. L. Weerawarne, X. Gao, H. Liang, H. J. Meyer, K. Hong, A. L. Gaeta, and B. Shim, “Multi-filament Inhibition and Resulting Solitary Wave Formation in Condensed Matter,” in FIO: 2016, OSA Technical Digest (online) (Optical Society of America, 2016), paper FF2C.1.

▸ G. C. Nagar, D. Dempsey, J. S. Sutherland, R. I. Grynko, and B. Shim, “Laser direct writing of waveguides in flexible glass and ultrafast visualization of its dynamics via time-resolved interferometry,” in CLEO: 2018, OSA Technical Digest (online) (Optical Society of America, 2018), paper JTu2A.3

▸ D. Weerawarne, R. I. Grynko, H. J. Meyer, and B. Shim, “Significant Enhancement of Third- and Fifth-Harmonic Generation in Air via Two-Color, Time-Resolved Methods,” in CLEO: 2015, OSA Technical Digest (online) (Optical Society of America, 2015), paper FM3D.4.

Talks/Posters

▸ R. I. Grynko, “Control and visualization of highly nonlinear processes,” National Institutes of Health (NIH) – Colloquium at Plenz Critical Brain Dynamics Lab (2018). (talk)

▸ R. I. Grynko, “Studying crystal structures of ferroelectric materials using nonlinear optics,” Physics Journal Club Meeting at Binghamton University (2018). (talk)

▸ R. I. Grynko, “Fabrication and characterization of femtosecond laser-written waveguides in flexible glass,” IMAPS Advances in Semiconductor Packaging Symposium (2017). (talk, won award for best student presentation)

▸ R. I. Grynko, D. L. Weerawarne, and B. Shim , “How can we control nonlinear propagation of high-intensity, ultrashort laser pulses?”, CREATES Science to Technology Day at Binghamton University (2016). (poster)

▸ R. I. Grynko, D.L. Weerawarne, X. Gao, H. Liang, H.J. Meyer, K. Hong, A.L. Gaeta, B. Shim, “Solitary wave propagation in condensed matter,” ACS Northeast Regional Meeting (2016). (talk)

▸ R. I. Grynko, “Butterfly effect in high-power, ultrashort laser propagation,” Physics Journal Club Meeting at Binghamton University (2015). (talk)

Language

Bilingual: English | Ukrainian; New York State Regents Proficiency: Spanish | French | Italian

Computer

C | C# | C++ | Python | MATLAB | Mathematica | HTML | JavaScript | CSS | Arduino | Machine learning | Cluster computing