9 papers
The Bragg Frequency Convertor: A Meeting Between Spatial and Temporal Periodicities For Selective Parametric Frequency Translation
Sajjad Taravati
This study introduces the Bragg Frequency Converter, a spatiotemporal-periodic grating concept that extends conventional Bragg gratings into the dynamic domain for pure parametric…
On-Chip Nonreciprocal Superconducting Frequency Multiplier for Cryogenic Millimeter-Wave Multiplexed Control
Sajjad Taravati
Space-time-periodic modulation of superconducting circuits offers a compact, on-chip route to nonreciprocity, frequency conversion, and parametric gain, without the bulk of convent…
Temporal Bragg Gratings: Broadband Reconfigurable Parametric Amplifiers
Sajjad Taravati
This paper introduces temporal Bragg gratings as a new class of broadband, reconfigurable parametric amplifiers. We present a comprehensive investigation of power amplification in…
Photon-Blockade Analogue Nonreciprocal Absorption in Spatiotemporal Metasurfaces
Sajjad Taravati
Controlling the flow of electromagnetic energy is essential for advancing quantum technologies. We introduce a spatiotemporally modulated superconducting metasurface that exhibits…
Frequency Conversion Characteristics of Spatiotemporal Josephson Metasurfaces for Quantum Applications
Sajjad Taravati
This presentation explores the various characteristics of a nonreciprocal, frequency-converting Josephson metasurface operating at millikelvin temperatures. Leveraging the unique p…
Designing Space-Time Metamaterials: The Central Role of Dispersion Engineering
Sajjad Taravati
Space-time metamaterials are redefining wave engineering by enabling fully dynamic four-dimensional control of electromagnetic fields, allowing simultaneous manipulation of frequen…