576 citations · 1.5k across the 25 of their papers we have counts for
21 papers · 1 filter
Ultra-directional and high-efficiency LEDs via gradient index filled micro-Horn collimators
Alexander Luce, Rasoul Alaee, Aimi Abass
Micro-LEDs (LEDs) are poised to transform AR/VR, display, and optical communication technologies, but they are currently hindered by low light extraction efficiency and non-dire…
Parametric Mie resonances and directional amplification in time-modulated scatterers
V. Asadchy, A. G. Lamprianidis, G. Ptitcyn +7
We provide a theoretical description of light scattering by a spherical particle whose permittivity is modulated in time at twice the frequency of the incident light. Such a partic…
Fourier-Engineered Plasmonic Lattice Resonances
Theng-Loo Lim, Yaswant Vaddi, M. Saad Bin-Alam +7
Resonances in optical systems are useful for many applications, such as frequency comb generation, optical filtering, and biosensing. However, many of these applications are diffic…
Scattering from spheres made of time-varying and dispersive materials
G. Ptitcyn, A. G. Lamprianidis, T. Karamanos +8
Exploring the interaction of light with time-varying media is an intellectual challenge that, in addition to fundamental aspects, provides a pathway to multiple promising applicati…
A Comprehensive Multipolar Theory for Periodic Metasurfaces
Aso Rahimzadegan, Theodosios D. Karamanos, Rasoul Alaee +4
Optical metasurfaces consist of a 2D arrangement of scatterers, and they control the amplitude, phase, and polarization of an incidence field on demand. Optical metasurfaces are th…
Giant asymmetric second-harmonic generation in bianisotropic metasurfaces based on bound states in the continuum
Ehsan Mobini, Rasoul Alaee, Robert W. Boyd +1
Bianisotropy is a powerful concept enabling asymmetric optical response, including asymmetric reflection, absorption, optical forces, light trapping, and lasing. The physical origi…
Kelvin's Chirality of Optical Beams
Sergey Nechayev, Jörg S. Eismann, Rasoul Alaee +3
Geometrical chirality is a property of objects that describes three-dimensional mirror-symmetry violation and therefore it requires a non-vanishing spatial extent. In contrary, opt…
Superscattering, Superabsorption, and Nonreciprocity in Nonlinear Antennas
Lin Cheng, Rasoul Alaee, Akbar Safari +3
We propose tunable nonlinear antennas based on an epsilon-near-zero material with a large optical nonlinearity. We show that the absorption and scattering cross sections of the ant…
Kerker Effect, Superscattering, and Scattering Dark State in Atomic Antennas
Rasoul Alaee, Akbar Safari, Vahid Sandoghdar +1
We study scattering phenomena such as the Kerker effect, superscattering, and scattering dark states in a subwavelength atomic antenna consisting of atoms with only electric dipole…
Dynamic coherent perfect absorption in nonlinear metasurfaces
Rasoul Alaee, Yaswant Vaddi, Robert W. Boyd
We propose a tunable coherent perfect absorber based on ultrathin nonlinear metasurfaces. The nonlinear metasurface is made of plasmonic nanoantennas coupled to an epsilon-near-zer…
Quantum metamaterials with magnetic response at optical frequencies
Rasoul Alaee, Burak Gurlek, Mohammad Albooyeh +2
We propose novel quantum antennas and metamaterials with strong magnetic response at optical frequencies. Our design is based on the arrangement of natural atoms with only electric…
Theory of optical forces on small particles by multiple plane waves
Ehsan Mobini, Aso Rahimzadegan, Carsten Rockstuhl +1
We theoretically investigate the optical force exerted on an isotropic particle illuminated by a superposition of plane waves. We derive explicit analytical expressions for the exe…
Theory of metasurface based perfect absorbers
Rasoul Alaee, Mohammad Albooyeh, Carsten Rockstuhl
Based on an analytic approach, we present a theoretical review on the absorption, scattering, and extinction of both dipole scatterers and regular arrays composed of such scatterer…
Optical alignment of oval graphene flakes
E. Mobini, A. Rahimzadegan, R. Alaee +1
Patterned graphene, as an atomically thin layer, supports localized surface plasmon-polaritons (LSPPs) at mid-infrared or far-infrared frequencies. This provides a pronounced optic…
Optical Force and Torque on Dipolar Dual Chiral Particles
Aso Rahimzadegan, Martin Fruhnert, Rasoul Alaee +2
On the one hand, electromagnetic dual particles preserve the helicity of light upon interaction. On the other hand, chiral particles respond differently to light of opposite helici…
Fundamental Limits of Optical Force and Torque
Aso Rahimzadegan, Rasoul Alaee, Ivan Fernandez-Corbaton +1
Optical force and torque provide unprecedented control on the spatial motion of small particles. A valid scientific question, that has many practical implications, concerns the exi…
All-dielectric reciprocal bianisotropic nanoparticles
Rasoul Alaee, Mohammad Albooyeh, Aso Rahimzadegan +3
The study of high-index dielectric nanoparticles currently attracts a lot of attention. They do not suffer from absorption but promise to provide control on the properties of light…
Exact dipolar moments of a localized electric current distribution
Ivan Fernandez-Corbaton, Stefan Nanz, Rasoul Alaee +1
The multipolar decomposition of current distributions is used in many branches of physics. Here, we obtain new exact expressions for the dipolar moments of a localized electric cur…
Manipulating the Interaction between Localized and Delocalized Surface Plasmon Polaritons in Graphene
Renwen Yu, Rasoul Alaee, Falk Lederer +1
The excitation of localized or delocalized surface plasmon polaritons in nanostructured or extended graphene has attracted a steadily increasing attention due to their promising ap…
A perfect absorber made of a graphene micro-ribbon metamaterial
Rasoul Alaee, Mohamed Farhat, Carsten Rockstuhl +1
Metamaterial-based perfect absorbers promise many applica- tions. Perfect absorption is characterized by the complete suppression of transmission and reflection and complete dissip…
Tunable Graphene Antennas for Selective Enhancement of THz-Emission
R. Filter, M. Farhat, M. Steglich +3
In this paper, we will introduce THz graphene antennas that strongly enhance the emission rate of quantum systems at specific frequencies. The tunability of these antennas can be u…