F. Ömer Ilday

 
 


REsearch interests:


When I look how structure and functionality arise in nature, the role of emergent phenomena is evident. It is inspiring that emergence of structure and functionality is ubiquitous, from pattern formation in an inanimate sand pile to primitive life forms, all the way up, in complexity, to the primate brain and modern human social constructs. It is also evident that the degree of complexity forms a continuum, starting from relatively simple nonlinear or delay-feedback systems to full-fledged complex behavior.


In contrast, when I look at man-made systems, I rarely see deliberate use of these principles. An engineering marvel, such as a modern jet, is extremely complicated, but it is possible, at least in principle, to predict its entire functionality by starting from either the lowest or the uppermost level and working one’s way up or down in its hierarchy of structure, accompanied, typically, with a polynomial increase in computational complexity. This is in sharp contrast to a bacterium; even though we understand much of its sub-units, this knowledge does not translate into prediction of its behavior at the system level. Is it not already time that we start developing technological devices that incorporate the same principles of operation and adaptability that govern, say, a bacterium?


I have a specific proposal, which I refer to as Nonlinearity Engineering: I propose to exploit complex nonlinear and stochastic dynamics to achieve superior technological functionalities, which may be difficult or even impossible to achieve with linear systems. This requires first and foremost deep understanding of the underlying dynamics as well as the right tools of control over the system under study. Ultrafast lasers and nanophotonic systems are ideal candidates for tools of control and target platform, respectively.


For additional information, see the web pages of Ultrafast Optics and Lasers Laboratory (UFOLAB).


IF THIS IS INTERESTING TO YOU:


For MS and PhD work, you need to be first admitted to a graduate program in any of the following: Electrical and Electronics Engineering, Physics, Material Science and Nanotechnology or Neuroscience at Bilkent University. For undergraduates volunteer work, internship or formal research course work, please contact me directly. I am always involved in every detail of our research, which means I can only supervise a very small number of students at any time. However, there is usually room for a motivated and capable-enough individual. Best is to simply ask me directly, preferably after reading several of our publications.  For postdoctoral work, please contact Dr. Ilday directly. We also routinely host visiting researchers within the framework of an existing collaboration agreement, and we are always open to new collaborations.


Selected publications [full list is here]:


  1. 1. O. Tokel, A. Turnalı, G. Makey, P. Elahi, T. Çolakoğlu, E. Ergeçen, Ö. Yavuz, R. Hübner, M. Zolfaghari Borra, I. Pavlov, A. Bek, R. Turan, D. K. Kesim, S. Tozburun, S. Ilday, F. Ö. Ilday, “In-chip microstructures and photonic devices fabricated by nonlinear laser lithography deep inside silicon,” Nature Photon. 11, 639–645(2017).

  2. 2. S. Ilday, G. Makey, G. B. Akgüç, Ö. Yavuz, O. Tokel, I. Pavlov, O. Gülseren, F. Ö. Ilday, “Rich complex behavior of self-assembled nanoparticles far from equilibrium,” Nature Commun. 8, 14942 (2017).

  3. 3. C. Kerse, H. Kalaycıoğlu, P. Elahi, B. Çetin, D. K. Kesim, Ö. Akçaalan, S. Yavaş, M. D. Aşık, B. Öktem, H. Hoogland, R. Holzwarth, and, F. Ö. Ilday, “Ablation-cooled material removal with ultrafast bursts of pulses,” Nature 537, 84–88 (2016).

  4. 4. S. Ilday, F. Ö. Ilday, R. Hübner, T. J. Prosa, I. Martin, G. Nogay, I. Kabacelik, Z. Mics, M. Bonn, D. Turchinovich, H. Toffoli, D. Toffoli, D. Friedrich, B. Schmidt, K.-H. Heinig, and R. Turan, “Multiscale self-assembly of silicon quantum dots into an anisotropic three-dimensional random network,” Nano Lett. 16, 1942–1948 (2016).

  5. 5. B. Öktem, I. Pavlov, S. Ilday, H. Kalaycıoglu, A. Rybak, S. Yavas, M. Erdogan and F. Ö. Ilday, “Nonlinear laser lithography for indefinitely large-area nanostructuring with femtosecond pulses,” Nature Photon. 7, 897–901 (2013).

  6. 6. B. Oktem, C. Ülgüdür and F. Ö. Ilday, “Soliton-similariton fibre laser,” Nature Photon. 4, 307 (2010).

  7. 7. F. Ö. Ilday, J. Buckley, and F. W. Wise, “Self-similar evolution of parabolic pulses in a laser cavity,” Phys. Rev. Lett. 92, 213902-1 (2004).



“Before the Gates of Excellence the high Gods have placed sweat.”

(Hesiod, Works and Days)

 

Associate Professor,

Ultrafast Optics and Lasers Laboratory (UFOLAB),

Department of Electrical and Electronics Engineering,

Department of Physics,

UNAM – National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology,

Graduate Program of Material Science and Nanotechnology, and

Graduate Program of Neuroscience,

Bilkent University, Ankara, Turkey

BS 1998 (Boğaziçi), PhD 2004 (Cornell)


PHone:

+90-312-290-8076


Fax:

+90-312-266-4579


Email:

ilday@bilkent.edu.tr


MAIL Address:

EE-506, Bilkent University, Çankaya, Ankara 06800, Turkey