A5068991701- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- Metamaterials and Metasurfaces Applications
- Optical measurement and interference techniques
- Acoustic Wave Resonator Technologies
- Molecular Junctions and Nanostructures
- Thermal Radiation and Cooling Technologies
- Underwater Acoustics Research
- Laser and Thermal Forming Techniques
- Nonlinear Optical Materials Studies
- Advanced Measurement and Metrology Techniques
- Advanced biosensing and bioanalysis techniques
- Various Chemistry Research Topics
- Microwave Imaging and Scattering Analysis
- Environmental Science and Water Management
University of Würzburg
2020-2025
University of Rijeka
2020
Abstract Plasmonic double helical antennas are a means to funnel circularly polarized light down the nanoscale. Here, an existing design tool for single helices is extended case of and used that combine large chiroptical interaction strength with highly directional emission. Full‐field numerical modeling underpins provides additional insight into surface charge distributions resonance widths. The fabricated by direct writing focused electron beam, technique unrivaled in terms spatial...
Scattering of light by plasmonic nanoparticles is classically described using bulk material properties with infinitesimally thin boundaries. However, because the quantum nature electrons, real interfaces have finite thickness, leading to nonclassical surface effects that influence scattering in small particles. Electrical gating offers a promising route control and study these effects, as static screening charges reside at boundary. We investigate modulation response upon direct electrical...
Visible and infrared photons can be detected with a broadband response via the internal photoeffect. By use of plasmonic nanostructures, i.e., nanoantennas, wavelength selectivity introduced to such detectors through geometry-dependent resonances. Also, additional functionality, like electronic responsivity switching polarization detection, has been realized. However, previous devices consisted large arrays nanostructures achieve detectable photocurrents. Here we show that this concept...
The electrical excitation of guided plasmonic modes at the nanoscale enables integration optical nanocircuitry into nanoelectronics. In this context, exciting plasmons with a distinct modal field profile constitutes key advantage over conventional single-mode integrated photonics. Here, we demonstrate selective lowest-order symmetric and antisymmetric in two-wire transmission line. We achieve mode selectivity by precisely positioning sources, i.e., junctions for inelastic electron tunneling,...
Abstract Field hotspots in nanoscale gaps of plasmonic antennas can boost nonlinear processes such as harmonic generation, photoelectron emission, and ultrafast electron transport. Alongside large field enhancement, phenomena often require control over the symmetry hotspot, which is challenging considering nanometer length scales. Here, by means strongly enhanced second unprecedented distribution a hotspot demonstrated systematically introducing geometrical asymmetry to antenna gap. Focused...
We recorded diffraction patterns using a commercially available slit and sensor over wide range of experimental circumstances, including near- far-field regimes oblique incidence at large angles. then compared the measured with theoretical intensity curves calculated via numerical integration formulas derived within framework scalar theory. Experiment theory show particularly good agreement when first Rayleigh-Sommerfeld (R-S) formula is used. The Kirchhoff formula, though problematic in...
Plasmonic double helical antennas are a means to funnel circularly polarized states of light down the nanoscale. Here, an existing design tool for single helices is extended case and used that combine large chiroptical interaction strength with highly directional emission. Full-field numerical modeling underpins provides additional insight into surface charge distributions resonance widths. The experimentally realized were studied regarding their polarization-dependent transmission behavior...
Classical electrodynamics describes the optical response of systems using bulk electronic properties and treats boundaries between two materials as infinitesimally thin. However, due to quantum nature electrons, interfaces have a finite thickness. Non-classical surface effects become increasingly important ever smaller nanoscale are realized eventually dominate over volume-related phenomena. Investigating electrons in such systems, therefore, becomes imperative. One way gain control...
We demonstrate modulation of second harmonic generation by systematically inducing field asymmetry in the gap gold nanoantennas via controlled geometric symmetry breaking. The concept is extended to electrical tuning nonlinear signal.
Coupling of free electrons with electromagnetic fields near but below the plasma frequency confined metallic nanostructures leads to plasmonic resonances. Their spectral response is strongly dependent on geometry, i.e., for nanorods, changes in aspect ratio cross-section length shift resonance frequency. In this way, resonances can be tuned from blue infrared, not actively.
Plasmons can be excited by inelastic tunneling of electrons [1,2]. This provides a broadband source plasmons that integrated into plasmonic nanocircuitry. The emission wavelength and bandwidth controlled via resonances which enhance the process. Here we present an electrically-driven multi-element Yagi-Uda antenna emits light one specific direction [3]. Furthermore, discuss mode-specific electric excitation in two-wire transmission line its application towards polarization-controlled...
Plasmonic dimer antennas create strong field enhancement by squeezing light into a nanoscale gap. These optical hotspots are highly attractive for boosting nonlinear processes, such as harmonic generation, photoelectron emission, and ultrafast electron transport. Alongside large enhancement, phenomena often require control over the asymmetry in hotspot, which is challenging considering nanometer length scales. Here, means of strongly enhanced second we demonstrate unprecedented distribution...