Hakan Altan

E-mail

haltan@metu.edu.tr

Department

Department of Physics

ORCID

0000-0002-2456-8827

Scopus Author ID

7801441454

Web of Science Researcher ID

A-4036-2017

VO2-Based Dynamic Coding Metamaterials for Terahertz Wavefront Engineering Akyurek, Bora; Noori, Aileen; Demirhan, Yasemin; Ozyuzer, Lutfi; Guven, Kaan; Altan, Hakan; Aygun, Gulnur (2025-01-01) Digital coding metasurfaces (DCMS) offer a promising alternative to conventional metasurface designs for achieving common functionalities by controlling the phase of reflected or transmitted electromagnetic waves. Their si...
Development of Polarization-Insensitive THz-to-IR Converters for Low-IR-Signature Target Detection and Imaging Aytaç, Berat; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2024-09-01) A THz-to-IR converter can be an effective solution for the detection of low-IR-signature targets by combining the advantages of mature IR detection mechanisms with high atmospheric transmittance in the THz region. A metall...
Investigation of resonant properties of metamaterial THz filters fabricated from vanadium dioxide thin films Zeyrek, Sehriban; Demirhan, Yasemin; Noori, Aileen; Tugay, Halime; Altan, Hakan; Sabah, Cumali; Aygün Özyüzer, Gülnur; Özyüzer, Lütfi (2024-04-01) Vanadium dioxide (VO2 ) is a promising candidate for electronic and optical switching appli- cations in the terahertz frequency range due to the metal to insulator transition (MIT). In this study, the use of VO2 patterned ...
2D Malzemelere Dayalı Terahertz Plazmonik Yükselteçlerin Nano Ölçekte Geliştirilmesi Altan, Hakan (2024-03-13)
Antipodal Vivaldi antenna with frequency selective surface for ultrawideband radar systems Köseni, Ercan; Altan, Hakan; Özdemir, Özgür (2024-01-01) The ultra wideband (UWB) antenna is one of the essential part of vital sign detection radar systems. The antenna characteristics of high gain and reduced side lobe level have a contribution to improve the detection capabil...
THz to IR Converter for Incoherent Detection of Radiation Aytac, B.; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2024-01-01) The field of THz imaging continues to rapidly develop with ever more variety and sensitivity in both methods of sensing as well as detectors in array imaging formats. Nevertheless, comparatively the techniques developed in...
Performance of an Active THz Imaging System for Recognition of Concealed Faces Yıldırım, İhsan Ozan; Altan, Hakan; ŞAHİN, ASAF BEHZAT (2023-01-01) Millimeter wave (MMW) and submillimeter wave (SMW) imaging techniques have a wide range of security applications due to their characteristics such as transmission through barrier materials. Biometric recognition based on M...
Fast and sensitive MMW imaging system with up-conversion readout working in the NIR Zone Kurup, Arun Ramachandra; Rozban, Daniel; Kopeika, Natan S.; Yitzhaky, Yitzhak; Altan, Hakan; Abramovich, Amir (2023-01-01) Focal plane arrays (FPA) constructed using glow discharge detectors (GDD) as the pixel elements proved to be an inexpensive methodology for generating MMW (millimeter wave)/THz (terahertz) images. In the abnormal glow mode...
The sub-terahertz region absorption of sputter deposited nanoscale TiAlV thin films Öksüzoğlu, Ramis Mustafa; Altan, Hakan; Abdüsselamoğlu, Mehmet Sait; Özkan, Özlem Başak; Bayram, Yasin; Chakar, Erkan Syuleyman (2023-01-01) Absorption in the sub-terahertz region in TiAlV thin films with their potential usage in detectors and plasmonic applications is a crucial point for device performance. This work aims to investigate the thickness-dependent...
Evaluation of performance of an active terahertz imaging system for concealed face recognition Yıldırım, İhsan Ozan; Doğru, Şebnem; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2023-01-01) One of the most important problems encountered by face recognition systems is occlusions. Especially with the COVID-19 pandemic, recognition of masked faces has been attracting interest. There are proposed visible spectrum...

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