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Boundary Effects of Weak Nonlocality in Multilayered Dielectric Metamaterials
Giuseppe Castaldi, Andrea Alù, Vincenzo Galdi
Nonlocal (spatial-dispersion) effects in multilayered metamaterials composed of periodic stacks of alternating, deeply subwavelength dielectric layers are known to be negligibly we…
Parametric amplification and bidirectional invisibility in PT-symmetric time-Floquet systems
Theodoros T. Koutserimpas, Andrea Alu, Romain Fleury
Parity-Time (PT) symmetric wave devices, which exploit balanced interactions between material gain and loss, exhibit extraordinary properties, including lasing and flux-conserving…
Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures
Alex Krasnok, Martin Caldarola, Nicolas Bonod +1
Resonant dielectric nanoparticles (RDNs) made of materials with large positive dielectric permittivity, such as Si, GaP, GaAs, have become a powerful platform for modern light scie…
Tunable Resonance Coupling in Single Si Nanoparticle-Monolayer WS2 Structures
Sergey Lepeshov, Mingsong Wang, Alex Krasnok +8
Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) are extremely attractive materials for optoelectronic applications in the visible and near-IR range. Here, w…
Coherent Virtual Absorption Based on Complex Zero Excitation for Ideal Light Capturing
Denis G Baranov, Alex Krasnok, Andrea Alù
Absorption of light is directly associated with dissipative processes in a material. In suitably tailored resonators, a specific level of dissipation can support coherent perfect a…
Enhancement of inherent Raman scattering in dielectric nanostructures with electric and magnetic Mie resonances
Kristina Frizyuk, Mehedi Hasan, Alex Krasnok +2
Resonantly enhanced Raman scattering in dielectric nanostructures has been recently proven to be an effcient tool for developing nanothermometry and experimental determination of t…
Optical circulation in a multimode optomechanical resonator
Freek Ruesink, John P. Mathew, Mohammad-Ali Miri +2
Optical circulators are important components of modern day communication technology. With their ability to route photons directionally, these nonreciprocal elements provide useful…
Nonlinear Metasurfaces: A Paradigm Shift in Nonlinear Optics
Alexander Krasnok, Mykhailo Tymchenko, Andrea Alu
Frequency conversion processes, such as second- and third-harmonic generation, are one of the most common effects in nonlinear optics which offer many opportunities for photonics,…
Boosting the Terahertz Photoconductive Antenna Performance with Optimized Plasmonic Nanostructures
Sergey Lepeshov, Andrei Gorodetsky, Alexander Krasnok +5
Advanced nanophotonics penetrates into other areas of science and technology, ranging from applied physics to biology and resulting in many fascinating cross-disciplinary applicati…
Coherent perfect absorbers: linear control of light with light
Denis G. Baranov, Alex Krasnok, Timur Shegai +2
Absorption of electromagnetic energy by a material is a phenomenon that underlies many applied problems, including molecular sensing, photocurrent generation and photodetection. Co…
All-optical switching and unidirectional plasmon launching with electron-hole plasma driven silicon nanoantennas
Sergey V. Li, Alexander E. Krasnok, Sergey Lepeshov +3
High-index dielectric nanoparticles have become a powerful platform for modern light science, enabling various fascinating applications, especially in nonlinear nanophotonics for w…
Optomechanically-induced spontaneous symmetry breaking
Mohammad-Ali Miri, Ewold Verhagen, Andrea Alu
We explore the dynamics of spontaneous breakdown of mirror symmetry in a pair of identical optomechanical cavities symmetrically coupled to a waveguide. Large optical intensities e…
Magnified imaging based on non-Hermitian nonlocal cylindrical metasurfaces
Silvio Savoia, Constantinos A. Valagiannopoulos, Francesco Monticone +3
We show that a cylindrical lensing system composed of two metasurfaces with suitably tailored non-Hermitian (i.e., with distributed gain and loss) and nonlocal (i.e., spatially dis…
Dynamically reconfigurable metal-semiconductor Yagi-Uda nanoantenna
Roman S. Savelev, Olga N. Sergaeva, Denis G. Baranov +2
We propose a novel type of tunable Yagi-Uda nanoantenna composed of metal-dielectric (Ag-Ge) core-shell nanoparticles. We show that, due to the combination of two types of resonanc…
A Reconfigurable Active Huygens' Metalens
Ke Chen, Yijun Feng, Francesco Monticone +9
Metasurfaces enable a new paradigm of controlling electromagnetic waves by manipulating subwavelength artificial structures within just a fraction of wavelength. Despite the rapid…