Gönül Turhan Sayan
Room No
Tel No
+90 (312) 210-2371


Ph.D in Electrical Engineering : December 9, 1988
K-Pulse Estimation and Target Identification
The Ohio State University (OSU),
Electrical Engineering Department, Columbus, Ohio, USA

M.Sc. in Electrical Engineering : August 21, 1981
Computer Aided Design and Construction of Small-Signal, Broad-Band, Low-Noise Microwave Amplifiers
Middle East Technical University (METU),
Electrical Engineering Department, TURKEY

B.S. in Electrical Engineering:   November 24, 1979
Middle East Technical University (METU), Electrical Engineering Department, TURKEY       

Research Interests

  • Novel Metamaterial Designs in Microwave, Terahertz and Infrared Regions with Applications to Multiband and Adjustable Resonators, RF Sensors, Antennas and Broadband Infrared Absorbers
  • Optical Sensors: Distributed Fiber Optical Sensors (DFOS), Surface Plasmon Resonance (SPR) Sensors, Optical Metamaterial  Sensors
  • Ultra-Wideband Electromagnetic Target Recognition with Ground Penetrating Radar (GPR) Applications: Subsurface Sensing and Thru-the-Wall Target Recognition
  • Use of Signal Processing Techniques for Ultra-Wideband Electromagnetic Target Feature Extraction


(Please use the link below for the complete list of Publications )

 Frequently Cited Journal Papers:

  1. S. K. Ozdemir and G. Turhan-Sayan, "Temperature effects on surface plasmon resonance: Design considerations for an optical temperature sensor,"  Journal of Lightwave Technology (IEEE/OSA publication), Vol.21, No.3, pp. 805-814, March 2003.
  2. E. Ekmekci, K. Topalli, T. Akin and G. Turhan-Sayan, “A Tunable Multi-Band Metamaterial Design Using Micro-Split SRR Structures,” Optics Express, Vol.17, No.18, pp.16046-16058, July 2009.
  3. E. Ekmekci, A.C. Strikwerda, K. Fan, G. Keiser, X. Zhang, G. Turhan-Sayan and R.D. Averitt, “Frequency tunable Terahertz metamaterials using broadside coupled split-ring resonators,” Physical Review B, Vol.83, Issue 19, Article No. 193103, (DOI:10.1103PhysRevB.83.193103), May 19, 2011.
  4. G. Turhan-Sayan, "Real Time Electromagnetic Target Classification Using a Novel Feature Extraction Technique with PCA-Based Fusion," IEEE Transactions on Antennas and Propagation, Vol.53, No.2, pp.766-776, February 2005.
  5. E. Ekmekci and G. Turhan-Sayan, "Comparative investigation of resonance characteristics and electrical size of the double-sided SRR, BC-SRR and conventional SRR type metamaterials for varying substrate parameters," Progress In Electromagnetics Research B, Vol. 12, 35-62, January 2009.
  6. E Ekmekci and G. Turhan-Sayan, “Multi-functional metamaterial sensor based on a broad-side coupled SRR topology with a multilayer substrate,” Applied Physics A-Materials Science & Processing, Vol. 110, Issue 1, pp. 189-197, January, 2013.
  7. O.Turkmen, E. Ekmekci and G. Turhan-Sayan, “Nested U-Ring Resonators: A Novel Multi-Band Metamaterial Design in Microwave Region,” IET Microwaves, Antennas and Propagation, Vol. 6, Issue 10, pp.1102–1108, 17 July 2012.


SCI Indexed Journal Papers within the Last 5 Years:

  1. N. Karacan, E. Ekmekci and G. Turhan-Sayan, "Response to "Comment on 'Sliding planar conjoined cut-wire-pairs: A novel approach for splitting and controlling the absorption spectra'" [J. Appl. Phys. 124, 105103 (2018)]," Journal of Applied Physics (Vol.128, Issue 12), published online in September 24, 2020. DOI: .
  2. I. Ozbay, A. Ghobadi, B. Butun and G. Turhan-Sayan, "Bismuth plasmonics for extraordinary light absorption in deep sub-wavelength geometries," Optics Letters, Vol. 45   Issue: 3   pp. 686-689, February 1, 2020 DOI: .
  3. O. Yesilyurt and G. Turhan-Sayan, "Metasurface Lens for Ultra-Wideband Planar Antenna," IEEE Transactions on Antennas and Propagation, Vol. 68, Issue 2, pp. 719-726, February 2020. DOI: .
  4. K. Üstün and G. Turhan-Sayan, "Broadband LWIR and MWIR Metamaterial Absorbers with a Simple Design Topology: Almost Perfect Absorption and Super-Octave Band operation in MWIR Band,"  Journal of the Optical Society of America B: Optical Physics (JOSA-B), Volume 34, Issue 7, 2017, Pages D86-D94, (DOI: ) OSA Publishing, USA, July 2017
  5. K. Üstün and G. Turhan-Sayan, “Ultra-broadband long-wavelength infrared metamaterial absorber based on a double-layer metasurface structure,” Journal of the Optical Society of America B:Optical Physics (JOSA-B), Vol.34, No. 2, pp.456-462 (DOI:, OSA Publishing, USA, February 2017.
  6. S. Kocaman and G. Turhan Sayan, “Comparison of coherently coupled multi-cavity and quantum dot embedded single cavity systems,” Optics Express, Vol. 24, Issue 25, pp. 29329-29341 , OSA Publishing, USA, 12 December 2016.
  7. K. Ustun and G. Turhan-Sayan, “Wideband Long Wave Infrared Metamaterial Absorbers based on Silicon Nitride,” Journal of Applied Physics,  J. Appl. Phys. 120, 203101 (2016); , AIP Publishing, USA, November 2016.