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Yigit Aytac, Ph.D.

Research Physicist, Optical Engineer

Alexandria, VA

yaytac1@gmail.com

678-772-6233


Programming Skills

Python, Octave, Mathematica, LabView, MatLab, (also: Latex, Lumerical, Sigmaplot, Origin, MathCad, Microsoft Office)


Experimental Skills

Pulsed titanium:sapphire lasers, optical parametric amplifiers and oscillators, and difference-frequency generation

Time-resolved differential transmission measurements

Optical and electrical semiconductor/semimetal performance characterization with an experience on device development in clean-room environment.

Data and signal acquisition methods pertaining to all-optical and/or time-resolved measurements

Theoretical framework of nonlinear optics, semiconductors, semimetals, ultrafast data interpretation and modeling

Photodetector responsivity, current-voltage, and light-current-voltage characterization

Continuous-wave excitation photoluminescence (PL) characterization of semiconductors

Fourier-transform infrared (FTIR) spectroscopy

Time-resolved measurements of surface plasmon resonance of thin metal films

Vacuum and cryogenic systems

Experience in nano-fabrication


Languages

English

Turkish



About Me

I am a member of the Photonics Research Laboratory at the University of Maryland. My research interests include nanotechnology and integrated photonics, electro-optical infrared sensors, numerical simulation, optical pulse propagation, and the application of ultrafast light sources for the study of light-matter interactions. My current projects are related to optical/electrical characterization of few-layer black phosphorus, optical modulation and sensing with 2-dimensional layered materials.

Previously, as a graduate student at the University of Iowa, I worked on the development of next-generation antimony-free superlattices for photo-detection applications from near- to long-wave infrared radiation. This work was in a collaboration with Sandia National Laboratory. Overall, my doctoral study was focused on the design, development, and all-optical characterization of low-dimensional nano-structures.


Work Experience

Postdoctoral Research Associate
University of Maryland, Department of Electrical and Computer Engineering
Laboratory of Physical Sciences
July 2016 - Current

Near-, mid-, and long-wave infrared optical and electrical characterization of two-dimensional (2-D) materials (such as graphene, black phosphorus, transition metal dichalcogenides) and metallic thin films.


Graduate Research Assistant
University of Iowa, Department of Physics and Astronomy
August 2012 - July 2016

Development of next-generation Ga-free InAs/InAsSb type-II superlattices (T2SLs)


Education

University of Iowa
Iowa City, Iowa
2016

Ph.D. in Physics (GPA:4.0/4.0)


Marmara Univeristy
Istanbul, Turkey
2008

B.S. in Physics (GPA: 3.8/4.0)


Selected Publications

  • Y. Aytac, M. Mittendorff, and T. E. Murphy, "Mid-Infrared Pump-Probe Measurements of Carrier Dynamics in Black Phosphorus" Frontiers in Optics, JTu3A. 31 2017
  • M. Mehdi, Y. Aytac, R. J. Suess, A. B. Sushkov, G. S. Jenkins, J. G. Analytis, H D. Drew, Thomas E. Murphy, "Time-resolved Optical Study of Carrier Dynamics in the Weyl Semimetal TaAs", Bulletin of the American Physical Society, 2017.
  • Y. Aytac., B. V. Olson, J. K. Kim, E. A. Shaner, S. D. Hawkins, J. F. Klem, J. Olesberg, M. E. Flatté, and T. F. Boggess. "Bandgap and temperature dependence of Auger recombination in InAs/InAsSb type-II superlattices" Journal of Applied Physics 119, 215705, 2016.
  • Y. Aytac., B. V. Olson, J. K. Kim, E. A. Shaner, S. D. Hawkins, J. F. Klem, M. E. Flatté, and T. F. Boggess. "Evidence of a Shockley-Read-Hall Defect State Independent of the Superlattice Band Edge Energies in InAs/InAsSb Type-II Superlattices" Phys. Rev. Applied 5, 054016, 2016.
  • Y. Aytac., B. V. Olson, J. K. Kim, E. A. Shaner, S. D. Hawkins, J. F. Klem, M. E. Flatté, and T. F. Boggess. "Temperature-dependent optical measurements of the dominant recombination mechanisms in InAs/InAsSb type-2 superlattices." Journal of Applied Physics 118, no. 12 2015: 125701.
  • Provence, S. R., R. Ricker, Y. Aytac, T. F. Boggess, and J. P. Prineas. "High power cascaded mid-infrared InAs/GaSb light emitting diodes on mismatched GaAs." Journal of Applied Physics 118, no. 12 (2015): 123108.
  • Y. Aytac, B. V. Olson, J. K. Kim, E. A. Shaner, S. D. Hawkins, J. F. Klem, M. E. Flatté, and T. F. Boggess "Effects of layer thickness and alloy composition on carrier lifetimes in mid-wave infrared InAs/InAsSb superlattices.", Applied Physics Letters 105, no. 2 2014: 022107.
  • Y. Aytac, B. V. Olson, J. K. Kim, E. A. Shaner, S. D. Hawkins, J. F. Klem, M. E. Flatté, and T. F. Boggess. " Temperature-dependent carrier lifetime measurements of InAs/InAsSb T2SLs." In SPIE OPTO, 2014.
  • Adhikary, Sourav, Subhananda Chakrabarti, Yigit Aytac, and A. G. U. Perera. "Multi-spectral InAs/GaAs-based quantum dot infrared photodetector with quaternary (InAlGaAs) capping operates at low bias voltage." In SPIE OPTO, pp. 86340V-86340V. International Society for Optics and Photonics, 2013.
  • Adhikary, Sourav, Yigit Aytac, Srujan Meesala, Seyoum Wolde, AG Unil Perera, and Subhananda Chakrabarti. "A multicolor, broadband (5-20 micro-meter), quaternary-capped InAs/GaAs quantum dot infrared photodetector." Applied Physics Letters 101, no. 26, 2012: 261114.