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

Laser Crystallization of Amorphous Ge Thin Films via a Nanosecond Pulsed Infrared Laser Korkut, Ceren; Cinar, Kamil; Kabacelik, Ismail; Turan, Raşit; Kulakci, Mustafa; Bek, Alpan (2021-08-01) Understanding the dynamics of the laser crystallization (LC) process of Ge thin films by nanosecond (ns) pulsed infrared (IR) lasers is important for producing homogeneous, crack-free crystalline device-grade films for use...
Single-molecule-resolution ultrafast near-field optical microscopy via plasmon lifetime extension OVALI, RASİM VOLGA; ŞAHİN, RAMAZAN; Bek, Alpan; TAŞGIN, MEHMET EMRE (2021-06-14) © 2021 Author(s).Metal nanostructures support plasmon oscillations on their surfaces, which normally decay very quickly. Nevertheless, the lifetime of these oscillations can be extended near a longer lifetime particle, e.g...
Surface Physical Properties of Ion Beam Sputtered Copper Thin Films on Poly Tetrafluoroethylene Atta, A.; Abdeltwab, E.; Bek, Alpan (2021-06-01) In this study thin copper (Cu) films are deposited on poly tetrafluoroethylene (PTFE) substrate using ion beam sputtering technique. The films are characterized using Raman spectroscopy, UV-VIS spectroscopy and atomic forc...
Fabrication of flexible, cost-effective, and scalable silver substrates for efficient surface enhanced Raman spectroscopy based trace detection Khan, Ghazanfar Ali; Demirtas, O. Ozge; Demir, Ahmet Kemal; AYTEKİN, ÖZLEM; Bek, Alpan; Bhatti, Arshad Saleem; Ahmed, Waqqar (2021-06-01) The fabrication and optimization of cost-effective, eco-friendly, uniform and flexible SERS platforms by facile synthesis routes has recently attracted great attention for trace detection of various analytes. Herein, we re...
Pulsed Infrared Laser Crystallization Mechanism of Amorphous Silicon Thin-Films Korkut, Ceren; ÇINAR, KAMİL; Bek, Alpan (2020-12-01) Laser crystallization of amorphous silicon layers is an active research field in photonic applications. In literature, typically single laser pulses are used to examine the absorption mediated crystallization of amorphous ...
Implementation of generalized Harvey-Shack theory in light scattering from rough surfaces Gunoven, M.; Nasser, H.; Ünal, Mustafa; Aytekin, O.; Turan, Raşit; Bek, Alpan (2020-12-01) We present a discrete implementation of generalized Harvey-Shack scalar scattering theory to calculate angular intensity distributions from height profiles of select randomly textured surfaces proposed for use in solar cel...
Nanosphere Concentrated Photovoltaics with Shape Control Esmaeilzad, Nasim Seyedpour; Demir, Ahmet Kemal; Hajivandi, Jamileh; Ciftpinar, Hande; Turan, Raşit; KURT, HAMZA; Bek, Alpan (2020-12-01) Dielectric colloidal nanospheres (NSs) are promising candidates for light management in photonic devices such as solar cells (SCs). NS arrays can direct the broad incident solar radiation into a set of tighter foci, at whi...
Fano-control of down-conversion in a nonlinear crystal via plasmonic-quantum emitter hybrid structures Artvin, Zafer; Gunay, Mehmet; Bek, Alpan; TAŞGIN, MEHMET EMRE (The Optical Society, 2020-12-01) Control of the nonlinear response of nanostructures via path interference effects, i.e., Fano resonances, has been studied extensively. In such studies, a frequency conversion process takes place near a hot spot. Here, we ...
Facile preparation of nanoparticle based SERS substrates for trace molecule detection Demirta, Ozge; Doğanay, Doğa; Öztürk, İbrahim Murat; Ünalan, Hüsnü Emrah; Bek, Alpan (Royal Society of Chemistry (RSC), 2020-10-01) In this work, we demonstrate that a polished Si wafer surface can be converted to possess strong surface-enhanced Raman scattering (SERS) activity by spray coating of polyol synthesized colloidal silver nanoparticles (AgNP...
Single-Step Periodic Photoelectrochemical Texturing of Silicon for Photovoltaics Avishan, Nardin; Akbıyık, Alp; Yüce, Emre; Bek, Alpan (2020-09-11) Compared to antireflection coatings, surface texturing achieved by wet and dry etching methods is an efficient and long-lasting technique for reflection reduction by enhancing light trapping. In this work, laser-assisted w...

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