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Yigit Aytac, Ph.D.

Research Scientist, Optical Engineer

Washington, DC

yigit@yaytac.com

678-772-6233


Programming Skills

Python, MatLab, Octave, Mathematica, LabView (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 NASA's CLARREO Pathfinder Science Team providing vicarious, and absolute radiometeric calibration results of the field-transfer radiometers, and the hyper-spectral imaging spectrometers.

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. My doctoral study was focused on the design, development, and all-optical characterization of low-dimensional nano-structures. As a post-doctoral associate at the UMD, I worked on optical/electrical characterization of few-layer black phosphorus for optical-modulation and -sensing.


Work Experience

Senior Research Scientist
Science Systems and Applications, Inc. - NASA Contractor
September 2018 - Current

Laboratory-based radiometric calibration of air- and space-borne remote sensing systems such as NASA’sthe Solar, Lunar Absolute Reflectance Imaging Spectroradiometer (SOLARIS) and the Climate AbsoluteRefractivity and Reflectance Observatory (CLARREO) Pathfinder


Postdoctoral Research Associate
University of Maryland, Department of Electrical and Computer Engineering
Laboratory of Physical Sciences
July 2016 - September 2018

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) for advanced photo-detection, and photo-emission in mid- to long-wave infrared spectral ranges


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.