A5066131664- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Near-Field Optical Microscopy
- Optical Coatings and Gratings
- Mechanical and Optical Resonators
- Advanced Antenna and Metasurface Technologies
- Thermal Radiation and Cooling Technologies
- Magneto-Optical Properties and Applications
- Silicon Nanostructures and Photoluminescence
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- 2D Materials and Applications
- Advanced MEMS and NEMS Technologies
- Strong Light-Matter Interactions
- Terahertz technology and applications
- Technology-Enhanced Education Studies
- Quantum Dots Synthesis And Properties
- Optical Polarization and Ellipsometry
- Advanced biosensing and bioanalysis techniques
- Nanocluster Synthesis and Applications
- Scientific Research and Technology
- Antenna Design and Analysis
Friedrich Schiller University Jena
2020-2025
Universidad Carlos III de Madrid
2023-2025
Helmholtz Institute Jena
2022-2023
Universitat Politècnica de València
2020-2022
Georgi Nadjakov Institute of Solid State Physics
2022
Donostia International Physics Center
2021
Universidad de Cantabria
2014-2020
Instituto de Óptica "Daza de Valdés"
2017-2019
Metasurfaces have recently risen to prominence in optical research, providing unique functionalities that can be used for imaging, beam forming, holography, polarimetry, and many more, while keeping device dimensions small. Despite the fact a vast range of basic metasurface designs has already been thoroughly studied literature, number metasurface-related papers is still growing at rapid pace, as research now spreading adjacent fields, including computational augmented virtual reality,...
Abstract Bound states in the continuum (BICs) emerge throughout physics as leaky/resonant modes that remain, however, highly localized. They have attracted much attention optics and photonics, especially metasurfaces, is, planar arrays of sub‐wavelength meta‐atoms. One their most outstanding features is arbitrarily large Q‐factors they induce upon approaching BIC condition, which exploited here to achieve a narrow transparency band. It first shown how shift canonical an all‐dielectric...
Optomechanical upconversion Molecules have rich signatures in their spectra at infrared wavelengths and are typically accessed with dedicated spectroscopic instrumentation. Chen et al . Xomalis report optomechanical frequency from the mid-infrared to visible domain using molecular vibrations coupled a plasmonic nanocavity ambient conditions (see Perspective by Gordon). Using different nanoantenna designs, one nanoparticle-on-resonator other nanoparticle-in-groove, both approaches show...
Enhancing the light‐matter interactions is important for many different applications like sensing, surface enhanced spectroscopies, solar energy harvesting, and quantum effects such as nonlinear frequency generation or spontaneous stimulated emission. Hybrid metal‐dielectric nanostructures have shown extraordinary performance in this respect, demonstrating their superiority with respect to bare metallic high refractive index dielectric nanostructures. Such hybrid can combine best of two...
Polydisperse rhodium nanoparticles have recently shown promise for ultraviolet (UV) plasmonics, but controlling the size and morphology of metal is essential tuning surface plasmon resonances. Here we report use slow-injection polyol methods to synthesize monodisperse Rh nanocubes with unprecedentedly large sizes slightly concave faces. The associated local resonances (LSPRs) red-shifted increasing in UV region from deep around 400 nm, consistent numerical simulations. illumination...
Nanoparticles made of High Refractive Index dielectric materials have been proposed as an alternative to metals driven by their low-losses and magnetic response. The coherent effects between the electric resonances are responsible for exceptional directionality properties that make them attractive in applications where enhancing light-matter interaction controlling radiation direction is extremely relevant. These nanoparticles, when used unit-cells more complex systems, such metasurfaces,...
Emission enhancement of quantum emitters is particularly relevant in the development single-photon sources, which are key elements information and communications. All-dielectric metasurfaces offer a route towards strong local density optical states via engineering high quality factor modes. In particular, recently proposed concept quasi-bound continuum (quasi-BIC) allows for precise control such resonances lattices with an asymmetric unit cell. Still, spectral band emission usually fixed by...
Abstract Zinc oxide (ZnO) nanowire lasers are increasingly integrated into complex optoelectronic devices as a source of coherent radiation. To enable the rational design these devices, it is crucial to understand how both resonator and its surrounding environment influence mode competition three-dimensional structure lasing modes. Additionally, realistic models process must account for transient gain dynamics. In order investigate impact an inhomogeneous environment, composed various...
Embedding metasurfaces in liquid crystal (LC) cells is a promising technique for realizing tunable optical functionalities. Here, we demonstrate spatially controlled all-optical switching of the response homogeneous silicon nanocylinder metasurface featuring various Mie-type resonances spectral range between 670 and 720 nm integrated nematic LC cell. The initial alignment molecules by photoalignment layers, where direction defined exposure with linearly polarized light at 450 wavelength....
The precise and deterministic integration of fluorescent emitters with photonic nanostructures is an important challenge in nanophotonics key to the realization hybrid systems, supporting effects such as emission enhancement, directional emission, strong coupling. Such typically requires definition or immobilization at defined positions nanoscale precision. While various methods were already developed for creating localized emitters, this work we present a new method fabrication featuring...
Local field enhancements produced by metal nanoparticles have been widely investigated in the visible range for common metals like gold and silver, but recent interest ultraviolet plasmonics has required consideration of alternate metals. Aluminum gallium are particularly attractive, native oxide that forms on them consumes smallest limits usefulness larger applications require contact with a bare surface. The used catalyst rhodium is noble no under normal atmospheric conditions recently...
Hybrid photonic-plasmonic cavities have emerged as a new platform to increase light-matter interaction capable enhance the Purcell factor in singular way not attainable with either photonic or plasmonic separately. In hybrid proposed so far, mainly consisting of metallic bow-tie antennas, gap sizes defined by lithography repeatable are limited minimum values \approx 10 nm. Nanoparticle-on-a-mirror (NPoM) far superior achieve smallest possible mode volumes, gaps smaller than 1 nm can be...
The confinement of electromagnetic energy to subwavelength volumes through nanoscale antennas can be used enhance the spontaneous emission quantum emitters. With this aim, different configurations metallic and high refractive index dielectric nanoparticles have been explored. Here, we carry out a comparative analysis planar metallic, dielectric, hybrid nanoantennas considering three parameters: Purcell factor enhancement, radiation efficiency, directionality properties. We focus our study on...
Abstract Sub-wavelength particles made from high-index dielectrics, either individual or as ensembles, are ideal candidates for multifunctional elements in optical devices. Their directionality effects traditionally analysed through forward and backward measurements, even if these directions not convenient in-plane scattering practical purposes. Here we present unambiguous experimental evidence the microwave range that a dimer of HRI spherical particles, perfect switching effect is observed...
Abstract High-index nanoparticles are known to support radiationless states called anapoles, where dipolar and toroidal moments interfere inhibit scattering the far field. In order exploit striking properties arising from these interference conditions in photonic integrated circuits, particles must be driven in-plane via waveguides. Here, we address excitation of electric anapole silicon disks when excited on-chip at telecom wavelengths. contrast normal illumination, find that...
Hybrid photonic-plasmonic cavities based on nanoparticle-on-a-mirror structures simultaneously provide ultralow mode volume and high $Q$-factor, so a very large Purcell factor, which is key measure of light-matter interaction. Operation such has been constrained to wavelengths below 1 \ensuremath{\mu}m, with the technologically relevant telecom regime remaining elusive. This study describes hybrid cavity operating at wavelengths. The proposed design leads extremely factors...
Bound states in the continuum (BICs) are ubiquitous many areas of physics, attracting special interest for their ability to confine waves with infinite lifetimes. Metasurfaces provide a suitable platform realize them photonics; such BICs remarkably robust, being however complex tune frequency-wavevector space. Here we propose scheme engineer and quasi-BICs single magnetic-dipole resonance meta-atoms. Upon changing orientation resonances, show that resulting quasi-BICs, emerging from...
In nanophotonics and quantum optics, we aim to control manipulate light with tailored nanoscale structures. Hybrid systems of nanostructures atomically thin materials are interest here, as they offer rich physics versatility due the interaction between photons, plasmons, phonons, excitons. this study, explore optical electronic properties a hybrid system, naturally n-doped monolayer WS2 covering gold disk. We demonstrate that nonresonant excitation disk in high absorption regime efficiently...
The spectral evolution of the degree linear polarization (PL) at a scattering angle 90° is studied numerically for high refractive index (HRI) dielectric spherical nanoparticles. behaviour PL(90°) analysed as function surrounding medium and particle radius, it compared with more conventional extinction efficiency parameter (Qext), usually used sensing applications. We focus on region where both electric magnetic resonances order not higher than two are located various semiconductor materials...
Low-losses and directionality effects exhibited by High Refractive Index Dielectric particles make them attractive for applications where radiation direction control is relevant. For instance, isolated metallo-dielectric core-shell or aggregates (dimers) of have been proposed building operational switching devices. Also, the possibility using optimizing solar cells performance has explored. Here, we present experimental evidence in microwave range, that a dimer spherical more efficient...
The influence of the degree purity a silicon nanoparticle on its resonances, either electric or magnetic, is assessed by using Mie theory as well finite-element simulations. In particular, it shown that main effect increase absorption due to pollutants observed in magnetic resonances. Concerning Kerker's conditions for directionality scattering [J. Opt. Soc. Am.73, 765 (1983)], found both are strongly shifted when material's varied. Resistive losses confirm quenching showing region dipole...
High Refractive Index (HRI) dielectric nanoparticles have been proposed as an alternative to metallic ones due their low absorption and magnetodielectric response in the VIS NIR ranges. For latter, important scattering directionality effects can be obtained. Also, systems constituted by dimers of HRI shown produce switching playing with polarization, frequency or intensity incident radiation. Here, we show that achieved a single eccentric metallo-HRI core-shell nanoparticle. As example,...
The influence of increasing the core size Ag–Si core–shell nanoparticles has been investigated by using values linear polarization degree at a right-angle scattering configuration, . Changes in dipolar resonances and directionality conditions as function radius (Rint) for fixed shell ( nm) have analysed. An empirical formula to obtain ratio monitoring magnetic resonance found. effect refractive index surrounding medium, mmed, zero backward almost-zero forward also studied. We weighed up...
The excitation of quasi bound states in the continuum (q-BIC) resonances has been demonstrated last years to be useful for lasing, non-linear effects, sensing, or photoluminescence enhancement. In particular, usage q-BIC all-dielectric hydrogenated amorphous silicon (a-Si:H) metasurfaces enhancing light-matter interaction with 2D materials recently proposed. Growing material directly on metasurface requires heating high temperatures, changing optical properties (absorption increase). This...