A5058382794- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Random lasers and scattering media
- Magnetic properties of thin films
- Magneto-Optical Properties and Applications
- Quasicrystal Structures and Properties
- Photonic and Optical Devices
- Thermal Radiation and Cooling Technologies
- Quantum Dots Synthesis And Properties
- Mineralogy and Gemology Studies
- Remote Sensing in Agriculture
- Magnetic Field Sensors Techniques
- Advanced Semiconductor Detectors and Materials
- Data Visualization and Analytics
- Quantum and electron transport phenomena
- Optical Polarization and Ellipsometry
- Nonlinear Optical Materials Studies
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
Aalto University
2018-2024
We present a comprehensive investigation of propagating spin waves in nanometer-thick yttrium iron garnet (YIG) films. use broadband spin-wave spectroscopy with integrated coplanar waveguides (CPWs) and microstrip antennas on top continuous patterned YIG films to characterize wave vectors up 10 rad/$\mu$m. All are grown by pulsed laser deposition. From transmission spectra, parameters such as the Gilbert damping constant, dispersion relation, group velocity, relaxation time, decay length...
Photonic modes exhibiting a polarization winding akin to vortex possess an integer topological charge. Lasing with charge 1 or 2 can be realized in periodic lattices of up six-fold rotational symmetry—higher order charges require symmetries not compatible any two-dimensional Bravais lattice. Here, we experimentally demonstrate lasing as high −5, +7, −17 and +19 quasicrystals. We discover rich ordered structures increasing the reciprocal space. Our quasicrystal design utilizes group theory...
We experimentally observe lasing in a hexamer plasmonic lattice and find that, when tuning the scale of unit cell, polarization properties emission change. By theoretical analysis, we identify modes as quasi-bound-states continuum topological charges zero, one, or two. A $T$-matrix simulation structure reveals that mode quality ($Q$) factors depend on with highest-$Q$ favored by lasing. The system thus shows loss-driven transition between trivial high-order charge.
Multicolor light sources can be used in applications such as lighting and multiplexing signals. In photonic plasmonic systems, one way to achieve multicolor is via multimode lasing. To this, nanoparticle arrays are typically arranged superlattices that lead multiple dispersions of the single coupled Bragg superlattice modes. Here, we show an alternative enable lasing arrays. We design a supercell square lattice by leaving part sites empty. This results dispersive branches caused period hence...
In this work, we study lasing in plasmonic nanoparticle arrays with complex structures. Complex structures can be formed by unit cells that contain more than one particle or creating supercells i.e. giant cells, which tens of particles. Here, supercell are based on a square array geometry. The is created leaving certain lattice sites empty, an aperiodic pattern. This repeated to form array. We calculate the band combining structure factors geometries empty approximation. show some...
The transition matrix, frequently abbreviated as T-matrix, contains the complete information in a linear approximation of how spatially localized object scatters an incident field. T-matrix is used to study scattering response isolated and describes optical complex photonic materials made from ensembles individual objects. T-matrices certain common structures, potentially, have been repeatedly calculated all over world again again. This not necessary constitutes major challenge for various...
Photonic modes exhibiting a polarization winding akin to vortex possess an integer topological charge. Lasing with charge 1 or 2 can be realized in periodic lattices of up six-fold rotational symmetry. Higher order charges require symmetries not compatible any two-dimensional Bravais lattice. Here, we experimentally demonstrate lasing as high -5, +7, -17 and +19 quasicrystals. We discover rich ordered structures increasing the reciprocal space. Our quasicrystal design utilizes group theory...
Multicolour light sources can be used in applications such as lighting and multiplexing signals. In photonic plasmonic systems, one way to achieve multicolour is via multi-mode lasing. To this, nanoparticle arrays are typically arranged superlattices that lead multiple dispersions of the single coupled superlattice Bragg modes. Here, we show an alternative enable lasing arrays. We design a supercell square lattice by leaving part sites empty. This results dispersive branches caused period...