A5017634721- Near-Field Optical Microscopy
- Quantum Dots Synthesis And Properties
- Plasmonic and Surface Plasmon Research
- Nanowire Synthesis and Applications
- Photonic Crystals and Applications
- Nanomaterials and Printing Technologies
- Nanofabrication and Lithography Techniques
- Photonic and Optical Devices
- High-Temperature Coating Behaviors
- Advanced Electron Microscopy Techniques and Applications
- Aluminum Alloy Microstructure Properties
- Silicon Nanostructures and Photoluminescence
- Advanced Fluorescence Microscopy Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- nanoparticles nucleation surface interactions
- Aluminum Alloys Composites Properties
- Copper-based nanomaterials and applications
- 2D Materials and Applications
- Advanced ceramic materials synthesis
- ZnO doping and properties
- Organic Electronics and Photovoltaics
- Orbital Angular Momentum in Optics
- Corrosion Behavior and Inhibition
- Hydrogen embrittlement and corrosion behaviors in metals
- Acoustic Wave Resonator Technologies
Institute for Atomic and Molecular Physics
2019-2022
Advanced Research Center for Nanolithography (Netherlands)
2020
Eckert & Ziegler (United States)
2017
Indian Institute of Technology Madras
2017
Visvesvaraya National Institute of Technology
2014
In recent years, imprint lithography has emerged as a promising patterning technique capable of high-speed and volume production. this work, we report highly reproducible one-step printing metal nanocubes. A dried film monocrystalline silver cubes serves the resist, soft polydimethylsiloxane stamp directly imprints final pattern. The use atomically smooth sharp faceted nanocubes facilitates high-resolution well-defined patterns with face-to-face alignment between adjacent cubes. It also...
The use of colloidal self-assembly to form the complex multiscale patterns in many optoelectronic devices has been a long-standing dream nanoscience community. While great progress made using charged colloids polar solvents, controlled assembly from nonpolar solvents is much more challenging. major challenge clustering caused by strong van der Waals (vdW) attraction between long-chain surface capping ligands passivating nanocrystals. Such degrades ordering packing during process. ligand...
We investigate the nanoscale excitation of Ag nanocubes with coherent cathodoluminescence imaging spectroscopy (CL) to resolve factors that determine spatial resolution CL as a deep-subwavelength technique. The 10–30 keV electron beam coherently excites localized plasmons in 70 nm cubes at 2.4 and 3.1 eV. radiation from these plasmon modes is collected far-field together secondary intensity. line scans across show exponentially decaying tails away cube reveal evanescent coupling field...
Hot electrons generated in metal nanoparticles can drive chemical reactions and selectively deposit cocatalyst materials on the plasmonic hotspots, areas where decay of plasmons takes place hot are created. While have been extensively used for nanomaterial formation, utilization holes simultaneous deposition has not yet explored. Herein, we demonstrate that an oxidation reaction manganese oxide (MnOx) different gold (Au) nanostructures a thin titanium dioxide (TiO2) layer, excited at their...
High-energy (1–100 keV) electrons can coherently couple to plasmonic and dielectric nanostructures, creating cathodoluminescence (CL) of which the spectral features reveal details material's resonant modes at a deep-subwavelength spatial resolution. While CL provides fundamental insight in optical modes, detecting its phase has remained elusive. Here, we use Fourier-transform holography determine far-field distribution fields scattered from nanoholes, nanocubes, helical nanoapertures...
We present a soft-stamping method to selectively print homogenous layer of CdSeTe/ZnS core-shell quantum dots (QDs) on top an array Si nanocylinders with Mie-type resonant modes. Using this new method, we gain accurate control the dot's angular emission through engineered coupling QDs these numerical simulations show that into or away from substrate can be precisely controlled by QD position nanocylinder. centered 400 nm diameter nanocylinder surface 98% directionality substrate....
Nanoparticle self-assembly and epitaxy are utilized extensively to make 1D 2D structures with complex shapes. High-resolution transmission electron microscopy (HRTEM) has shown that single-crystalline interfaces can form, but little is known about the strain dislocations at these interfaces. Such information critically important for applications: drastically reducing dislocation density was key breakthrough enabling widespread implementation of light-emitting diodes, while engineering been...
High-energy (1-100 keV) electrons can coherently couple to plasmonic and dielectric nanostructures creating cathodoluminescence (CL) of which the spectral features reveal details material's resonant modes at deep-subwavelength spatial resolution. While CL provides fundamental insight in optical modes, detecting its phase has remained elusive. Here, we introduce Fourier-transform holography as a method determine far-field distribution scattered fields. We record interferences between...
Cathodoluminescence spectroscopy (CL) is a unique technique to probe optical modes at the nanoscale. The electric field surrounding 10-30 keV electron beam dynamically polarizes matter, creating excitations over 0-10 eV spectral range, that are then detected in far field. CL can measure dispersion of plasmonic and dielectric nanostructures deep-subwavelength spatial resolution. So far, has probed angle-dependent spectrum polarization nanoscale emitters. However, detecting phase emitted...
In this work, we investigate a tetracene/Si singlet-triplet down-conversion solar cell geometry in which control the directional emission of quantum dots (QDs). system, photons visible range (450-550 nm) excite high-energy singlet-excitons tetracene that rapidly convert into two triplet-excitons at about half energy. The triplet-exciton energy is transferred to QDs subsequently emit 1000-1100 nm. A significant loss channel QD directed upwards, so anisotropic downward underlying Si essential....
Efficient light management is essential to achieve high-efficiency solar cell geometries: ensuring the absorption of sunlight in active region a fundamental principle photovoltaic device. By controlling spectrum and angular distribution device, can be enhanced. We investigate two geometries which we control directional emission quantum dots (QDs): tetracene\Si based on singlet-triplet down-conversion luminescent concentrator (LSC)