Alpan Bek

E-mail

bek@metu.edu.tr

Department

Department of Physics

ORCID

0000-0002-0190-7945

Scopus Author ID

6602813700

Web of Science Researcher ID

A-4847-2010

Enhanced catalytic performance through precise structural modification of Au-Ag nanoworms using controlled etching process Khan, Ghazanfar Ali; Bek, Alpan; Masson, Jean-Francois; Ahmed, Waqqar (2025-05-20) Polycrystalline nanomaterials inherently possess a high concentration of defects, owing to the presence of grain boundaries. These defects, while abundant in smaller nanoparticles (NPs), can become embedded within the bulk...
Vertical Self-Assembly of Gold Nanoworms for Sensitive Surface-Enhanced Raman Spectroscopy-Based Trace Detection Khan, Ghazanfar Ali; Demir, Ahmet Kemal; Demirtas, Ozge; Tasgin, Dilek Isik; Bek, Alpan; Bhatti, Arshad Saleem; Masson, Jean-Francois; Ahmed, Waqqar (2025-04-03) The assembly of anisotropic nanoparticles into closely packed structures results in unique functionalities. Herein, we report a 3D multilayer vertical assembly of worm-shaped Au nanoparticles using a carefully regulated ev...
Enhancing InGaN LED performance via ALD-grown Al2O3 sidewall passivation Bayramlı, Hasan Mert; Genç, Muhammet; Yücel, Oğuzhan; Bulut, B.; Bek, Alpan; Demirtaş, Mustafa (2025-04-01) InGaN-based light-emitting diodes (LEDs) are at the forefront of solid-state lighting technologies due to their superior efficiency and broad spectral emission. However, their performance is often compromised by leakage cu...
Nanosecond IR Laser-Assisted Selective 3D Etching of Silicon for Photovoltaics Akhtaryarazar, Darya; Kadan, Viktor; Dadashi, Khalil; Demirbas, Kardelen; Bek, Alpan; Borra, Mona Zolfaghari; Arıkan, Bülent; GOODARZİ, ARİAN; Turan, Raşit; Pavlov, Ihor (2025-01-01) Selective etching of laser-modified silicon (Si) enables 3D micro-sculpturing, offering new opportunities for photovoltaic (PV) applications. This technique facilitates high-aspect-ratio microstructures for light trapping ...
Active Tunable Extraordinary Optical Transmission in the Visible Regime Asif, Hira; TAŞGIN, MEHMET EMRE; Bek, Alpan; ŞAHİN, RAMAZAN (2025-01-01) Active tuning of components in the photonic integrated circuits (PICs) is crucial for achieving programmable devices, especially in the visible regime [1]. However, the operational bandwidth and response time of photonic d...
Laser-Induced Damage of UHMW-PE-Based Layered Ballistic Materials Candan, Can; Kaya Çekin, Emine Yasemen; Akşit Kaya, Elif Türkan; Tiken, Mehmet; Bek, Alpan; Berberoğlu, Halil; ORHAN, ELİF; Yeniay, Aydın (2024-11-19) The laser-induced damage threshold properties of material structures play a key role in identifying and selecting optimum materials with the respective geometric configurations for laser shielding applications. The laser-i...
Gate leakage reduction in AlGaN/GaN HEMTs using in situ ion treatment Nawaz, Muhammad Imran; Gurbuz, Abdulkadir; Salkim, Gurur; Zafar, Salahuddin; Akoglu, Busra Cankaya; Bek, Alpan; Ozbay, Ekmel (2024-09-01) A new in situ treatment method is proposed to reduce the gate leakage in normally-on AlGaN/GaN HEMTs. It consists of O2-Ar ion bombardment before the gate metalization. Ion treatment is found to improve the quality of gate...
Development of a selective wet-chemical etchant for precise 3D sculpting of silicon enabled by infrared non-linear laser modification Zolfaghari Borra, Mona; Radfar, Behrad; Nasser, Hisham; Çolakoğlu, Tahir; Tokel, Onur; Turnalı, Ahmet; Işık Taşgın, Dilek; Toffoli, Hande; Toffoli, Daniele; İlday, Fatih Ömer; Turan, Raşit; Pavlov, Ihor; Bek, Alpan (2024-09-01) Recently-demonstrated high-quality three-dimensional (3D) subsurface laser processing inside crystalline silicon (c-Si) wafers opens a door to a wide range of novel applications in multidisciplinary research areas. Using t...
Voltage-controlled extraordinary optical transmission in the visible regime Asif, Hira; Bek, Alpan; TAŞGIN, MEHMET EMRE; ŞAHİN, RAMAZAN (2024-03-15) Control of components in integrated photonic circuits is crucial in achieving programmable devices. Operation bandwidth of a plasmonic device cannot be generally tuned once it is manufactured, especially in the visible reg...
Enhanced Photoluminescence from Quantum Emitter-Nanoplasmonic Antenna Hybridization by a Facile Fabrication Method Genç, Sinan; Yilmaz, Alpay; Fernandez, Carlos Rodriguez; Caglayan, Humeyra; Bek, Alpan (2024-01-01) Gaps between tiny metallic nanostructures create strong local fields and small mode volumes, known as hybrid plasmonic modes. This study introduces a nanocavity formed by silver nanoparticles on a gold substrate with hexag...

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