A5049110807- Quantum Dots Synthesis And Properties
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Semiconductor Lasers and Optical Devices
- Thin-Film Transistor Technologies
- Neural Networks and Reservoir Computing
- Optical Coherence Tomography Applications
- Orbital Angular Momentum in Optics
- Chalcogenide Semiconductor Thin Films
- Quantum Mechanics and Non-Hermitian Physics
- Nonlinear Photonic Systems
- Nanowire Synthesis and Applications
- Advanced Fiber Laser Technologies
- Nonlinear Optical Materials Studies
- Silicon Nanostructures and Photoluminescence
- Quantum optics and atomic interactions
Bilkent University
2019-2022
University of Tabriz
2016-2017
We propose and demonstrate construction of highly uniform, multilayered superstructures CdSe/CdZnS core/shell colloidal nanoplatelets (NPLs) using liquid interface self-assembly. These NPLs are sequentially deposited onto a solid substrate into slabs having monolayer-precise thickness across tens cm2 areas. Because near-unity surface coverage excellent uniformity, amplified spontaneous emission (ASE) is observed from an uncharacteristically thin film 6 NPL layers, corresponding to mere 42 nm...
Abstract Whispering gallery mode (WGM) resonators are shown to hold great promise achieve high‐performance lasing using colloidal semiconductor nanocrystals (NCs) in solution phase. However, the low packing density of such gain media phase results increased thresholds and poor stability these WGM lasers. To address issues, here optical quantum wells (CQWs) is proposed form high‐density close‐packed solid films constructed around a coreless fiber incorporating resulting whispering modes...
Here, the first account of self-resonant fully-colloidal u-lasers made from colloidal quantum well (CQW) solution is reported. A deep patterning technique developed to fabricate well-defined high aspect-ratio on-chip CQW resonators grating waveguides and in-plane reflectors. CQWs patterned layers are closed-packed with sharp edges residual-free lifted-off surfaces. Additionally, method successfully applied various nanoparticles including dots metal nanoparticles. It observed that process...
This study demonstrates an ultra-thin colloidal gain medium consisting of bi-layers quantum wells (CQWs) with a total film thickness 14 nm integrated high-index dielectrics. To achieve optical from such nanocrystal film, hybrid waveguide structures partly composed self-assembled layers CQWs and dielectric material are developed shown: in asymmetric architecture employing one thin underneath the case quasi-symmetric pair films sandwiching CQWs. Numerical modeling indicates that modal...
Abstract In this work, monolithically‐fabricated vertical cavity surface emitting lasers (VCSELs) of densely‐packed, orientation‐controlled, atomically flat colloidal quantum wells (CQWs) using a self‐assembly method is reported and single‐mode lasing from record thin gain medium with film thickness 7 nm under femtosecond optical excitation demonstrated. Specially engineered CQWs are used to demonstrate these hybrid CQW‐VCSELs consisting only few layers single monolayer achieved the media by...
High scattering cross section of plasmonic nanoparticles in intermediate band solar cells (IBSCs) based on quantum dots (QDs) can obviate the low photon absorption QD layers. In this report, we present a modeling procedure to extract optical and electrical characteristics GaAs-based cell (PIBSC). It is shown that metal (MNPs) are responsible for incident photons absorber layer lead photocurrent enhancement, provided an optimum size density calculated. Proper design layers control energy...
Lasers based on semiconductor colloidal quantum wells (CQWs) have attracted wide attention, thanks to their facile solution-processability, low threshold and range spectral tunability. Colloidal microlasers whispering-gallery-mode (WGM) resonators already been widely demonstrated. However, due microscale size typically supporting multiple modes, they suffer from multimode competition higher threshold. The ability control the multiplicity of modes oscillating within laser achieving...
In article number 2000479, Hilmi Volkan Demir and co-workers demonstrate single-mode lasing from an ultrathin self-assembled monolayer of colloidal quantum wells (CQWs) with a record thickness 7 nm. The CQWs are integrated into high-quality-factor microcavity accurate spectral/spatial alignment the cavity mode. By overcoming long-pending problem limited electrical conductivity in thicker films, such gain media may enable electrically-driven lasers.