Yazar "Ay, Feridun" için listeleme
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A comparative device performance assesment of CVD grown MoS2 and WS2 monolayers
Sar, Hüseyin; Özden, Ayberk; Yorulmaz, Büşra; Sevik, Cem; Perkgöz, Nihan Kosku; Ay, Feridun (Springer, 2018)In this study, optical and electronic transport properties of chemical vapor deposition (CVD) grown 2D WS2 and MoS2 based transistors and photodetectors are investigated and compared in ambient air by using 2D flakes grown ... -
Control of Optical Amplification Process with Extremely Low Background Loss in Er:Al2O3 Waveguides
Demirtaş, Mustafa; Odaci, Cem; Perkgöz, Nihan Kosku; Sevik, Cem; Ay, Feridun (IEEE, 2017)We report on record low-loss single mode a-Al2O3 planar waveguides and growth optimization of a-Er2O3 layers to control erbium-doping level of a-Al2O3 layers realized using Atomic Layer Deposition (ALD). Effect of growth ... -
CVD grown 2D MoS2 layers: A photoluminescence and fluorescence lifetime imaging study
Özden, Ayberk; Sar, Hüseyin; Yeltik, Aydan; Madenoğlu, Büşra; Sevik, Cem; Ay, Feridun; Perkgöz, Nihan Kosku (Wiley-V C H Verlag GMBH, 2016)In this letter, we report on the fluorescence lifetime imaging and accompanying photoluminescence properties of a chemical vapour deposition (CVD) grown atomically thin material, MoS2. mu-Raman, mu-photoluminescence (PL) ... -
CVD growth of monolayer MoS2: Role of growth zone configuration and precursors ratio
Özden, Ayberk; Ay, Feridun; Sevik, Cem; Perkgöz, Nihan Kosku (IOP Publishing LTD, 2017)Single-layer, large-scale two-dimensional material growth is still a challenge for their wide-range usage. Therefore, we carried out a comprehensive study of monolayer MoS2 growth by CVD investigating the influence of ... -
Design and realization of ALD grown Al2O3 waveguides for applications in silicon based photonics
Demirtaş, Mustafa (Anadolu Üniversitesi, 2014)Bu tezde silisyum tabanlı fotonik uygulamalarında Atomik Katman Kaplama (AKK-ALD) ile büyütülmüş Al?O? dalga kılavuzlarının tasarım ve gerçeklemesi ele alınmıştır. Al?O? büyütme işlemi ALD kullanılarak yapılmıştır. Farklı ... -
A distinct correlation between the vibrational and thermal transport properties of group VA monolayer crystals
Kocabaş, Tugbey; Çakır, Deniz; Gülseren, Oğuz; Ay, Feridun; Perkgöz, Nihan Kosku; Sevik, Cem (Royal Soc Chemistry, 2018)The investigation of thermal transport properties of novel two-dimensional materials is crucially important in order to assess their potential to be used in future technological applications, such as thermoelectric power ... -
Erbium-doped spiral amplifiers with 20 dB of net gain on silicon
Vazquez-Cordova, Sergio A.; Dijkstra, Meindert; Bernhardi, Edward H.; Ay, Feridun; Worhoff, Kerstin; Herek, Jennifer L.; Pollnau, Markus (Optical Soc Amer, 2014)Spiral-waveguide amplifiers in erbium-doped aluminum oxide on a silicon wafer are fabricated and characterized. Spirals of several lengths and four different erbium concentrations are studied experimentally and theoretically. ... -
Extensive mode mapping and novel polarization filter design for ALD grown Al2O3 ridge waveguides
Demirtaş, Mustafa; Özden, Ayberk; Acikbas, Ethem; Ay, Feridun (Springer, 2016)In this work we report on realistic simulations aiming at extending our design knowledge on the fabrication and optimization of highly efficient integrated optical waveguide amplifiers. We focus specifically on atomic layer ... -
Focused-ion-beam nanostructuring of Al2O3 dielectric layers for photonic applications
Ay, Feridun; Worhoff, Kerstin; de Ridder, Rene M.; Pollnau, Markus (IOP Publishing LTD, 2012)In this work, we report on utilization and optimization of the focused-ion-beam technique for the fabrication of nanostructures on Al2O3 waveguides for applications in integrated photonic devices. In particular, the ... -
Low Loss Atomic Layer Deposited Al2O3 Waveguides for Applications in On-Chip Optical Amplifiers
Demirtaş, Mustafa; Odaci, Cem; Perkgöz, Nihan Kosku; Sevik, Cem; Ay, Feridun (IEEE-Inst Electrical Electronics Engineers Inc, 2018)We present the growth and optimization of ultralow loss Si-based Al2O3 planar waveguides, which have a high potential to boost the performance of rare-earth ion doped waveguide devices operating at visible and C-band ... -
Polarization insensitive single mode Al2O3 rib waveguide design for applications in active and passive optical waveguides
Özden, Ayberk; Demirtaş, M.; Ay, Feridun (Springeropen, 2015)Both passive and active, single mode, wavelength and polarization insensitive design of Al2O3 rib waveguides on SiO2 substrate is reported. Influence of the waveguide height, etch depth, waveguide width and operation ... -
Thermal Conductivity Suppression in Nanostructured Silicon and Germanium Nanowires
Özden, Ayberk; Kandemir, Ali; Ay, Feridun; Perkgöz, Nihan Kosku; Sevik, Cem (Springer, 2016)The inherent low lattice thermal conductivity (TC) of semiconductor nanowires (s-NW) due to one-dimensional phonon confinement might provide a solution for the long-lasting figure-of-merit problem for highly efficient ... -
Vibrational and mechanical properties of single layer MXene structures: a first-principles investigation
Yorulmaz, Uğur; Özden, Ayberk; Perkgöz, Nihan Kosku; Ay, Feridun; Sevik, Cem (IOP Publishing LTD, 2016)MXenes, carbides, nitrides and carbonitrides of early transition metals are the new members of two dimensional materials family given with a formula of Mn+1 X-n. Recent advances in chemical exfoliation and CVD growth of ...
