202 citations · 1.3k across the 26 of their papers we have counts for
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Temporal Quadrupole Moments: Floquet Higher-Order Topology with Nonreciprocal Frequency-Converting Corner States
Sajjad Taravati, Jingbang Liu
We introduce the temporal quadrupole moment and leverage its nonreciprocal frequency-converting topological corner states to experimentally realize a magnet-free transceiving circu…
Magnet-Free Nonreciprocal Phase-Shifter Based on Time Modulation
Sajjad Taravati, George V. Eleftheriades
Recently, nonreciprocal phase shifters have attracted a surge of interest thanks to the advent of nonreciprocal electromagnetic systems, such as nonreciprocal metasurfaces, nonreci…
Lightweight Low-Noise Linear Isolator Integrating Phase-Engineered Temporal Loops
Sajjad Taravati, George V. Eleftheriades
The quest for efficient and versatile microwave and optical isolators has recently spawned several novel space-time-modulated isolator structures. However, such space-time isolator…
Highly Linear Nonmagnetic Circulator Enabled By A Temporal Nonreciprocal Phase Shifter
Sajjad Taravati, George V. Eleftheriades
Conventional circulators are made of magnetic ferrites and suffer from a cumbersome architecture, incompatibility with integrated circuit technology and inability for high frequenc…
Pure and Linear Frequency Converter Temporal Metasurface
Sajjad Taravati, George V. Eleftheriades
Metasurfaces are ultrathin structures which are constituted by an array of subwavelength scatterers with designable scattering responses. They have opened up unprecedented exciting…
Full-duplex Reflective Beamsteering Metasurface Featuring Magnetless Nonreciprocal Amplification
Sajjad Taravati, George V. Eleftheriades
Nonreciprocal radiation refers to electromagnetic wave radiation in which a structure provides different responses under the change of the direction of the incident field. Modern w…
Programmable Nonreciprocal Metaprism
Sajjad Taravati, George V. Eleftheriades
Optical prisms are made of glass and map temporal frequencies into spatial frequencies by decomposing incident white light into its constituent colors and refract them into differe…
Four-Dimensional Wave Transformations By Space-Time Metasurfaces
Sajjad Taravati, George V. Eleftheriades
Static metasurfaces have shown to be prominent compact structures for reciprocal and frequency-invariant transformation of electromagnetic waves in space. However, incorporating te…
Nonreciprocal-Beam Phased-Array Antennas
Reza Karimian, Shahrokh Ahmadi, Mona Zaghloul +1
This study presents a nonreciprocal-beam phased-array antenna constituted of phase-gradient patch radiators integrated with transistor-based nonreciprocal phase shifters. Such an a…
Space-Time Medium Functions as a Perfect Antenna-Mixer-Amplifier Transceiver
Sajjad Taravati, George V. Eleftheriades
We show that a space-time-varying medium can function as a front-end transceiver, i.e., an antenna-mixer-amplifier. Such a unique functionality is endowed by space-time surface wav…
Full-Duplex Nonreciprocal-Beam-Steering Metasurfaces Comprising Time-Modulated Twin Meta-Atoms
Sajjad Taravati, George V. Eleftheriades
We present the concept, theoretical model and experimental implementation of a full-duplex nonreciprocal-beam-steering transmissive phase-gradient metasurface. Such a metasurface i…
Generalized Space-Time Periodic Diffraction Gratings: Theory and Applications
Sajjad Taravati, George V. Eleftheriades
This paper studies the theory and applications of the diffraction of electromagnetic waves by space-time periodic (STP) diffraction gratings. We show that, in contrast with convent…