294 citations · 547 across the 20 of their papers we have counts for
20 papers
Electromagnetic Multipole Theory for Two-dimensional Photonics
Iridanos Loulas, Evangelos Almpanis, Minas Kouroublakis +3
We develop a full-wave electromagnetic (EM) theory for calculating the multipole decomposition in two-dimensional (2-D) structures consisting of isolated, arbitrarily shaped, inhom…
Realization of the all-optical phase modulator, filter, splitter, and self-consistent logic gates based on assembled magneto-optical heterostructures
Jie Xu, Yun You, Fengwen Kang +5
All-optical computing has recently emerged as a vibrant research field in response to the energy crisis and the growing demand for information processing. However, the efficiency o…
Anisotropic Virtual Gain and Large Tuning of Particles' Scattering by Complex-Frequency Excitations
Grigorios P. Zouros, Iridanos Loulas, Evangelos Almpanis +2
Active tuning of the scattering of particles and metasurfaces is a highly sought-after property for a host of electromagnetic and photonic applications, but it normally requires ch…
Tunable all-optical logic gates based on nonreciprocal topologically protected edge modes
Jie Xu, Panpan He, Delong Feng +4
All-optical logic gates have been studied intensively for their potential to enable broadband, low-loss, and high-speed communication. However, poor tunability has remained a key c…
Highly Directional Scattering of Terahertz Radiation by Cylinders using Complex-Frequency Waves
Iridanos Loulas, Grigorios P. Zouros, Evangelos Almpanis +1
In this study we investigate the directional scattering of terahertz radiation by dielectric cylinders, focusing on the enhancement of directionality using incident radiation of co…
Unidirectional guided-wave-driven metasurfaces for arbitrary wavefront control
Shiqing Li, Kosmas L. Tsakmakidis, Tao Jiang +5
Metasurfaces, composed of subwavelength electromagnetic microstructures, known as meta-atoms, are capable of reshaping the wavefronts of incident beams in desired manners, making t…
Exceeding the Classical Time-bandwidth Product in Nonlinear Time-invariant Systems
Alireza Mojahed, Kosmas L. Tsakmakidis, Lawrence A. Bergman +1
The classical 'time-bandwidth' limit for linear time-invariant (LTI) devices asserts that it is impossible to store broadband waves (large Δω's) for long times (large Δt's). For st…
Topological Extraordinary Optical Transmission
K. Baskourelos, O. Tsilipakos, T. Stefański +4
The incumbent technology for bringing light to the nanoscale, the near-field scanning optical microscope, has notoriously small throughput efficiencies - of the order of 10^(-4) -…
Three-Dimensional Invisibility to Superscattering Induced by Zeeman-Split Modes
Grigorios P. Zouros, Georgios D. Kolezas, Evangelos Almpanis +1
We report that the fundamental three-dimensional (3-D) scattering single-channel limit can be overcome in magneto-optical assisted systems by inducing nondegenerate magnetoplasmoni…
Hyperpolarizability of plasmonic meta-atoms in metasurfaces
M. Saad Bin-Alam, Joshua Baxter, Kashif M. Awan +7
Plasmonic metasurfaces are promising as enablers of nanoscale nonlinear optics and flat nonlinear optical components. Nonlinear optical responses of such metasurfaces are determine…
Comment on "Nonreciprocal cavities and the time-bandwidth limit"
Kosmas L. Tsakmakidis, Yun You, Tomasz Stefanski +1
In their paper in Optica 6, 104 (2019), Mann et al. claim that linear, time-invariant nonreciprocal structures cannot overcome the time-bandwidth limit, and do not exhibit an advan…
High-efficiency triple-resonant inelastic light scattering in planar optomagnonic cavities
Petros Andreas Pantazopoulos, Kosmas L. Tsakmakidis, Evangelos Almpanis +2
Optomagnonic cavities have recently been emerging as promising candidates for implementing coherent microwave-to-optical conversion, quantum memories and devices, and next generati…
A nonreciprocal optical resonator with broken time-invariance for arbitrarily high time-bandwidth performance
Ivan Cardea, Davide Grassani, Simon J. Fabbri +6
Most present-day resonant systems, throughout physics and engineering, are characterized by a strict time-reversal symmetry between the rates of energy coupled in and out of the sy…
Plasmonic Nanolasers Without Cavity, Threshold and Diffraction Limit using Stopped Light
Kosmas L. Tsakmakidis, Joachim M. Hamm, Tim W. Pickering +1
We present a plasmonic waveguide where light pulses are stopped at well-accessed complex-frequency zero-group-velocity points. Introducing gain at such points results in cavity-fre…
Control and Dynamic Competition of Bright and Dark Lasing States in Active Nanoplasmonic Metamaterials
Sebastian Wuestner, Joachim M. Hamm, Andreas Pusch +3
Active nanoplasmonic metamaterials support bright and dark modes that compete for gain. Using a Maxwell-Bloch approach incorporating Langevin noise we study the lasing dynamics in…
Theory of light amplification in active fishnet metamaterials
Joachim M. Hamm, Sebastian Wuestner, Kosmas L. Tsakmakidis +1
We establish a theory that traces light amplification in an active double-fishnet metamaterial back to its microscopic origins. Based on ab initio calculations of the light/plasmon…
Gain and plasmon dynamics in negative-index metamaterials
Sebastian Wuestner, Andreas Pusch, Kosmas L. Tsakmakidis +2
Photonic metamaterials allow for a range of exciting applications unattainable with ordinary dielectrics. However, the metallic nature of their meta-atoms may result in increased o…
Evanescent Gain in "Trapped Rainbow" Negative Refractive Index Heterostructures
Edmund I. Kirby, Joachim M. Hamm, Tim Pickering +2
We theoretically and numerically analyze a five-layer "trapped rainbow" waveguide made of a passive negative refractive index (NRI) core layer and gain strips in the cladding. Anal…
Overcoming losses with gain in a negative refractive index metamaterial
Sebastian Wuestner, Andreas Pusch, Kosmas L. Tsakmakidis +2
On the basis of a full-vectorial three-dimensional Maxwell-Bloch approach we investigate the possibility of using gain to overcome losses in a negative refractive index fishnet met…
Linear coupling between lightwaves in metamaterials enables lossless artificial magnetism
Kosmas L. Tsakmakidis, Marek S. Wartak, Durga P. Aryal +1
A well-known principle in optical physics states that power can never be exchanged between two light waves propagating inside a homogeneous medium when the medium response is stric…