Balcı, Sinan
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Balcı, S
Balci, S
Balci, S.
Balci, Sinan
Balcı, S.
Balci, S
Balci, S.
Balci, Sinan
Balcı, S.
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sinanbalci@iyte.edu.tr
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04.04. Department of Photonics
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Current Staff
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Documents
65
Citations
2583
h-index
25
Documents
60
Citations
2426
Scholarly Output
41
Articles
28
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139470/13078
Supervised MSc Theses
6
Supervised PhD Theses
6
WoS Citation Count
1069
Scopus Citation Count
1139
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0
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4
WoS Citations per Publication
26.07
Scopus Citations per Publication
27.78
Open Access Source
24
Supervised Theses
12
| Journal | Count |
|---|---|
| ACS Applied Nano Materials | 3 |
| ACS Photonics | 2 |
| Applied Physics Letters | 2 |
| The Journal of Physical Chemistry C | 2 |
| Journal of Materials Chemistry C | 2 |
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41 results
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Now showing 1 - 10 of 41
Master Thesis Dimension Dependent Optoelectronic Properties of Cesium Lead Halide Perovskites(Izmir Institute of Technology, 2019) Özcan, Mehmet; Şahin, Hasan; Balcı, Sinan; Şahin, Hasan; Balcı, SinanAll-inorganic cesium lead halide perovskites (ILHPs), are gaining wide variety of role as strong contenders due to their extraordinary photovoltaic features in optoelectronic research with tunable band-gap, large absorption cross-section, long carrier lifetime, and high carrier mobility. Most of the initial studies focused on bulk-like perovskite materials, while the rapidly growing colloidal perovskite nanocrystals impress additional interest because of their unique properties. In this thesis, colloidal lead halide perovskite nanocrystals’ optoelectronic properties are investigated and associated with their size and dimensionality. The photoluminescence characteristics of colloidal lead halide perovskite nanocrystals can be tuned by reducing their dimensionality. Thin layer fabrication of CsPbBr3 films which consist of 2D lead halide perovskite nanoplatelets, is achived by a novel coating approach via electrospraying from precursor solution. Electrospraying method represents not only a new and fast perovskite film fabrication but also dimensional tunability by changing the amount of oleylamine which is intercalating agent. Moreover, thicknessdependence of the structural, electronic and vibrational properties of orthorhombic CsPbI3, which is one of the most stable phase at room temperature, is investigated by means of state-of-the-art first-principles calculations. It is also investigated that the electronic band gap increases with decrease in perovskite thickness due to quantum size effect. Lastly, it is investigated that water induced transition to form large bundles of CsPbBr3 nanowires show a a redshifted photoluminescence. Water molecule causes the detachment of ligands from the perovskite surface which leads to form bundles. In summary, this thesis provides an understanding of dimension dependent optoelectronic properties of lead halide perovskite.Master Thesis Investigation of Photodetectors Using Graphene Field Effect Transistors Incombination With Functional Dyematerials(Izmir Institute of Technology, 2020) Yakar, Ozan; Balcı, Sinan; Şahin, Hasan; Balcı, Sinan; Şahin, HasanA J-aggregate dye is a type of water-soluble, functional dye, which has a sharp and narrow absorption peak after it self-assembles into a brick-wall structure at high concentrations. The absorption peak of the J-aggregates is sharp, narrow and shifted to longer wavelengths compared to their monomer form and it is in the visible or near infrared spectrum. Due to its very sharp and narrow absorption, it has been used in silver halide photography, non-linear optics, lasing and sensing applications. On the other hand, graphene is one atom layer thick, honeycomb lattice of carbon atoms. In the pure, freestanding form, the bands of its electronic structure touch at one point, making it a gapless semimetal. Due to this characteristic, it is possible to manipulate its optical and electronic properties by changing the Fermi energy of graphene. Therefore, graphene found applications in many fields such as light emitting diodes, photodetectors, Hall sensors, optical modulators and flexible optoelectronics. The functional dye materials have not been combined with graphene photodetectors even though they are highly sensitive to light, less toxic than their competitors and stable at room temperature. In this thesis, using a J-aggregate dye, which has a sharp absorption peak around 585 nm wavelength, a graphene phototransistor has been demonstrated. By changing the charge concentration on graphene, using the charge carriers that arise from the excitation of J-aggregate dye, reversible modulation of graphene Dirac point has been demonstrated. In addition, a novel thin film formation technique has been developed in this study. Porous polyethylene membrane has been used to create thin films of water-soluble materials, such as J-aggregates, on hydrophobic surfaces.Article Citation - WoS: 18Citation - Scopus: 46Phosphor-Based White Led by Various Glassy Particles:control Over Luminous Efficiency(The Optical Society, 2019) Yüce, Hürriyet; Güner, Tuğrul; Balcı, Sinan; Demir, Mustafa MuammerGenerating white light through a mainstream remote phosphor design suffers from phosphor conversion efficiency loss due to a backscattering of light. Such a loss also reduces luminous efficiency of the resulting white light. To overcome this issue, various glassy scatterers with different morphologies such as glass bubbles, glass beads, and nanosized silica particles were employed as scatterers, together with a fixed amount of yellow phosphor (YAG:Ce3+) and a poly(dimethylsiloxane) (PDMS) matrix. In addition, the simulation of the system validates the rigorous multiple scattering of the incoming light most probably due to refractive index mismatch between the glass bubbles and surrounding PDMS matrix along with the internal reflections. (C) 2019 Optical Society of AmericaArticle Citation - WoS: 6Citation - Scopus: 6Polar Solvent-Free Room Temperature Synthesis of Cspbx3 (x = Br, Cl) Perovskite Nanocubes(Royal Society of Chemistry, 2023) Güvenç, Çetin Meriç; Kocabaş, Aşkın; Balcı, SinanConventionally, colloidal lead halide perovskite nanocubes have been synthesized by the hot-injection or ligand-assisted reprecipitation (LARP) methods. We herein demonstrate a polar solvent-free room temperature method for the synthesis of CsPbX3 (X = Br, Cl) nanocubes. In addition to the commonly used ligand pair of oleylamine and oleic acid, guanidinium (GA) has been used to passivate the surface of the nanocrystals. Our study demonstrates that GA inhibits the formation of low dimensional structures such as nanowires and nanoplatelets and further supports the formation of perovskite nanocubes. In fact, GA diminishes the restricted monomer-addition effect of long-chain oleylammonium (OLAM) ions to the nanocrystal. We show that above a critical GA/OLAM molar ratio, the synthesis yields homogeneous CsPbX3 (X = Br, Cl) nanocubes. Importantly, we observe the nucleation and growth kinetics of the GA-assisted CsPbBr3 nanocube formation by using in situ absorption and photoluminescence (PL) measurements. Small nanocrystals with an excitonic absorption peak at around 435 nm and photoluminescence (PL) maxima at 447 nm were nucleated and continuously shifted to longer wavelengths during the growth period. Crucially, our method allows the synthesis of CsPbCl3 nanocubes at room temperature without using polar organic solvents. The synthesized CsPbBr3, CsPb(Cl0.5Br0.5)3, and CsPbCl3 nanocubes have PL peaks at 508 nm, 443 nm, and 405 nm, photoluminescence quantum yields (PLQY) of 85%, 58% and 5%, and lifetimes of 18.98 ns, 18.97 ns, and 14.74 ns, respectively.Article Citation - WoS: 84Citation - Scopus: 82Topological Engineering of Terahertz Light Using Electrically Tunable Exceptional Point Singularities(American Association for the Advancement of Science, 2022) Ergöktaş, M. Said; Soleymani, Sina; Kakenov, Nurbek; Wang, Kaiyuan; Smith, Thomas B.; Bakan, Gökhan; Balcı, Sinan; Principi, Alessandro; Novoselov, Kostya S.; Özdemir, Şahin K.; Kocabaş, ÇoşkunThe topological structure associated with the branch point singularity around an exceptional point (EP) can provide tools for controlling the propagation of light. Through use of graphene-based devices, we demonstrate the emergence of EPs in an electrically controlled interaction between light and a collection of organic molecules in the terahertz regime at room temperature. We show that the intensity and phase of terahertz pulses can be controlled by a gate voltage, which drives the device across the EP. Our electrically tunable system allows reconstruction of the Riemann surface associated with the complex energy landscape and provides topological control of light by tuning the loss imbalance and frequency detuning of interacting modes. Our approach provides a platform for developing topological optoelectronics and studying the manifestations of EP physics in light-matter interactions.Doctoral Thesis Green synthesis of silver nanowires and novel assembly technique for iron oxide nanocubes(01. Izmir Institute of Technology, 2024) Güvenç, Tuğçe Aybüke Arıca; Balcı, Sinan; Adem, UmutGümüş nanoteller, mükemmel elektriksel iletkenlikleri, plazmonik davranışları ve esneklikleriyle bilinir ve bu nedenle çeşitli gelişmiş uygulamalar için oldukça uygundurlar. Bu tez çalışması, gümüş nanotellerin hem çevre dostu sentezini, hem de biyomedikal uygulamalarda gelişmiş manyetik nanoyapılar için bir şablon olarak ikili rolünü araştırmıştır. Çalışmanın ilk bölümünde, geçiş metali tuzlarının gümüş nanotellerin morfolojisini kontrol etmedeki etkisi araştırılmıştır. Çevre dostu indirgeyici madde olarak gliserolün kullanılması, belirli geçiş metali tuzlarının nanotel morfolojisini önemli ölçüde etkileyebileceğini göstermiştir. Deneysel koşulların dikkatli bir şekilde optimize edilmesiyle, gümüş nanoteller yüksek en boy oranlarıyla başarıyla sentezlenmiştir. Bu yeşil sentez yaklaşımı, esnek elektronik, sensörler ve daha fazlası için nanoteller üretmek için sürdürülebilir bir yol sağlar. İkinci bölümde, gümüş nanoteller, demir oksit nanoküplerin manyetik hipertermi performansını artırmak için yüksek yüzey alanlı bir şablon olarak sunulmuştur. Demir oksit nanoküpler, manyetik anizotropilerini artırmak için gümüş nanotellerin yüzeyine dekore edilmiştir. Manyetik karakterizasyon ve özgül emilim oranı analizi, bu yapının uygulanan manyetik alan koşullarına bağlı olarak değişen manyetik alanlar altında ısıtma verimliliğini artırdığını ve tek başına demir oksit nanopartiküllerinden daha üstün performans gösterdiğini ortaya koymaktadır.Doctoral Thesis Strong and Weak Light-Matter Interactions in Plasmonic and Optical Cavities(01. Izmir Institute of Technology, 2023) Polat, Nahit; Balcı, SinanThis thesis investigates the interaction of light and matter through both experimental and theoretical approaches, focusing on two key topics: Strong and Weak coupling. We also examine the field of strong light-matter interactions under two headings: plasmonic and optical cavities. In the section on plasmonic cavities, we focus on the strong coupling between surface plasmon polaritons and excitons with different optical properties and localized surface plasmon resonance. We also discuss the strong coupling between localized surface plasmon resonance and excitons in plasmonic nanoparticles with different optical properties due to their different shapes. This thesis focuses on the theoretical and optical characterization of the aforementioned topics. Therefore, details on the manufacturing processes are not given. Instead, it presents a comparative analysis of optical measurement results and related simulation data, to which I have contributed more. In addition, we demonstrate for the first time hyperspectral imaging of exciton polaritons at optical microcavities. Two metal thin films acting as reflectors and a polymer matrix containing a collection of quantum emitters form the hybrid system for polariton imaging. We show a strong exciton-photon interaction between photons trapped in the microcavity and Frenkel excitons of dye molecules placed inside the optical microcavity. We find that exciton polaritons in the optical microcavity can be imaged and spatially mapped using hyperspectral imaging in the visible region. In the field of weak light-matter interactions, the focus of the thesis is on the Fano resonance, which is a unique case in the weak coupling regime. The degree of coupling between interacting systems plays a critical role in determining the extent to which constructive and destructive interference phenomena occur in the system. An important example of destructive interference is the Fano resonance, which is caused by interference between two optical paths that are characterized by different states: one is narrow and discrete, and the other is broad and continuum. This is the first study to theoretically investigate the destructive interference between subwavelength excitonic nanoparticles placed on the surface of a prism for Fano resonance observations and the evanescent wave scattering on the prism surface. In an attempt to understand the intricate dynamics between the evanescent wave and the Fano resonance, we study the effect of changing the angle of incidence of the incident plane wave on the properties of the Fano resonance. Furthermore, we also investigate how the size of the excitonic nanoparticles and the absorption linewidth influence the properties of the Fano resonance.Article Citation - WoS: 7Citation - Scopus: 8Seed-Mediated Synthesis of Colloidal 2d Halide Perovskite Nanoplatelets(Wiley, 2021) Güvenç, Çetin Meriç; Balcı, SinanColloidal synthesis of two-dimensional lead halide perovskite nanoplatelets (2D LHP NPLs) with a general formula of L-2[APbX(3)](n-1)PbX4 has been widely performed by using hot-injection or ligand assisted reprecipitation methods. Herein, for the first time, we report on seed-mediated synthesis of two and three monolayers (n=2, 3) lead halide perovskite nanoplatelets without using A-site cation halide salt (AX; A=Cesium, methylammonium, formamidinium and, X=Cl, Br, I) and long chain alkylammonium halide salts (LX; L=oleylammonium, octylammonium, butylammonium and, X=Cl, Br, I). The nanocrystal seeds have been prepared by reacting lead (II) halide salt and coordinating ligands in a nonpolar solvent and then they have been reacted with cesium oleate, formamidinium oleate or methylamine. Our facile synthesis route enabling further understanding of the growth dynamics of LHP NPLs provides highly stable, monodisperse NPLs with very narrow absorption and emission linewidths (min. 68 meV), and high PLQY (max. 37.6%).Article Citation - WoS: 192Citation - Scopus: 194Multispectral Graphene-Based Electro-Optical Surfaces With Reversible Tunability From Visible To Microwave Wavelengths(Nature Research, 2021) Ergoktas, M. Said; Bakan, Gökhan; Kovalska, Evgeniya; Le Fevre, Lewis W.; Fields, Richard P.; Steiner, Pietro; Yu, Xiaoxiao; Balcı, SinanOptical materials with colour changing abilities have been explored for use in display devices(1), smart windows(2,3) or in the modulation of visual appearance(4-6). The efficiency of these materials, however, has strong wavelength dependence, which limits their functionality to a specific spectral range. Here, we report graphene-based electro-optical devices with unprecedented optical tunability covering the entire electromagnetic spectrum from the visible to microwave. We achieve this non-volatile and reversible tunability by electro-intercalation of lithium into graphene layers in an optically accessible device structure. The unique colour changing capability, together with area-selective intercalation, inspires the fabrication of new multispectral devices, including display devices and electro-optical camouflage coating. We anticipate that these results provide realistic approaches for programmable smart optical surfaces with a potential utility in many scientific and engineering fields such as active plasmonics and adaptive thermal management.Article Citation - WoS: 9Citation - Scopus: 9Fourier Transform Plasmon Resonance Spectrometer Using Nanoslit-Nanowire Pair(American Institute of Physics, 2019) Uulu, Doolos Aibek; Ashirov, Timur; Polat, Nahit; Yakar, Ozan; Balcı, Sinan; Kocabaş, CoşkunIn this paper, we present a nanoscale Fourier transform spectrometer using a plasmonic interferometer consisting of a tilt subwavelength slit-nanowire pair on a metallic surface fabricated by the focused ion beam microfabrication technique. The incident broadband light strongly couples with the surface plasmons on the gold surface, and thus, surface plasmon polaritons (SPPs) are generated. The launched SPPs interfere with the incident light and generate high contrast interference fringes in the nanoslit. The transmitted SPPs through the metal nanoslit can decouple into free space and are collected by an objective in the far field. The spectroscopic information of the incidence light is obtained by fast Fourier transform of the fringe pattern of the SPPs. In our design, there is no need for a bulky dispersive spectrometer or dispersive optical elements. The dimension of the spectrometer is around 200 mu m length. Our design is based on inherent coherence of the SPP waves propagating through the subwavelength metal nanoslit structures etched into an opaque gold film.