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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
Publications
Theses Advised
Open Courses
Projects
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...
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...
Investigation of resonant properties of metamaterial THz filters fabricated from vanadium dioxide thin films
Zeybek, Sehriban; Demirhan, Yasemin; Noori, Aileen; Tugay, Halime; Altan, Hakan; SABAH, CUMALİ; Aygun, Gulnur; Ozyuzer, Lut (2023-01-01)
Vanadium dioxide (VO2) is a promising candidate for electronic and optical switching applications in the terahertz frequency range due to the metal to insulator transition (MIT). In this study, the use of VO2 patterned as ...
Propagation of Laguerre-Gaussian Modes at Millimeter-wave through Scattering Media
Dogru, Sebnem; Altan, Hakan; ŞAHİN, ASAF BEHZAT (2023-01-01)
This work consists of the generation of free-space Laguerre-Gaussian (LG) modes at millimeter-wave frequencies by use of a 3D-printed spiral phase plate and measuring the transmission capability of LG beams with respect to...
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...
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...
Response of a Glow Discharge Detector to Far Infrared Radiation
Kusoglu-Sarikaya, Cemre; Akbar, Demiral; Altan, Hakan (2022-11-01)
Today, the fact that THz and mm-waves can be used in many areas of our daily lives reveals the necessity for devices that can efficiently detect these waves. Due to the low energies with respect to ambient conditions, it h...
Detection and recognition of concealed faces using a 340 GHz imaging system
YILDIRIM, İHSAN OZAN; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2022-10-28)
Biometric recognition and surveillance systems based on visible band imaging cameras encounter a number of limitations such as the effects of lighting conditions and occlusions. As a result, there is an interest in beyond ...
1030 nm All-Fiber Closed-Loop Fiber Optic Gyroscope with High Sensitivity
Keskin, Hakan; Vural, Huseyin Avni; Altinoz, Bagis; Bektik, Umit; Altan, Hakan (2022-10-01)
Angle random walk (ARW) is a critical noise component of a typical gyroscope alongside with bias instability noise. ARW has dominant effects especially in short-term accuracy. The measurement uncertainty degrades with the ...
Broadband THz Absorber Layers for Microbolometer Applications
Atik, Bahar; Demirörs, Oytun; Yıldırım, Mustafa; Altan, Hakan; Esentürk, Okan (2022-09-02)
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