62 citations · 310 across the 17 of their papers we have counts for
17 papers
Reaching the optical propagation limit in temporal analog computing
Zeki Hayran
A central goal of optical computing is to perform calculations on the timescale of light propagation. Yet many analog photonic solvers require feedback, storage or field build-up b…
Pulse-driven photonic transitions and nonreciprocity in space-time modulated metasurfaces
Zeki Hayran, John B. Pendry, Prasad P. Iyer +1
Time-varying photonic systems open new possibilities for controlling light, enabling photonic time crystals, time reflection and refraction, frequency conversion, synthetic gauge f…
Space-time refraction of space-time wave packets
Zeki Hayran, John B. Pendry
Space-time modulation of refractive index can produce synthetically moving interfaces with arbitrary apparent velocities, including superluminal motion, offering new ways to contro…
Chirality-driven all-optical image differentiation
Stefanos Fr. Koufidis, Zeki Hayran, Francesco Monticone +2
Optical analog computing enables powerful functionalities, including spatial differentiation, image processing, and ultrafast linear operations. Yet, most existing approaches rely…
Broadband Low-loss Unidirectional Reflection On-chip with Asymmetric Dielectric Metasurface
Heijun Jeong, Zeki Hayran, Yuan Liu +6
Metasurface has emerged as a powerful platform for controlling light at subwavelength thickness, enabling new functionalities for imaging, polarization manipulation, and angular mo…
Observation of broadband super-absorption of electromagnetic waves through space-time symmetry breaking
Matteo Ciabattoni, Zeki Hayran, Francesco Monticone
Using time as an additional design parameter in electromagnetism, photonics, and wave physics is attracting considerable research interest, motivated by the possibility to explore…
Comprehensive evidence of lasing from a 2D material enabled by a dual-resonance metasurface
Isabel Barth, Manuel Deckart, Donato Conteduca +9
Semiconducting transition metal dichalcogenides (TMDs) have gained significant attention as a gain medium for nanolasers, owing to their unique ability to be easily placed and stac…
Beyond the Rozanov Bound on Electromagnetic Absorption via Periodic Temporal Modulations
Zeki Hayran, Francesco Monticone
Incorporating time-varying elements into electromagnetic systems has shown to be a powerful approach to challenge well-established performance limits, for example bounds on absorpt…
versus : Dispersion and Energy Constraints on Time-Varying Photonic Materials and Time Crystals
Zeki Hayran, Jacob B. Khurgin, Francesco Monticone
Photonic time-varying systems have attracted significant attention owing to their rich physics and potential opportunities for new and enhanced functionalities. In this context, th…
Using Time-Varying Systems to Challenge Fundamental Limitations in Electromagnetics
Zeki Hayran, Francesco Monticone
Time-varying systems open intriguing opportunities to explore novel approaches in the design of efficient electromagnetic devices. While such explorations date back to more than ha…
Spectral Causality and the Scattering of Waves
Zeki Hayran, Aobo Chen, Francesco Monticone
Causality - the principle stating that the output of a system cannot temporally precede the input - is a universal property of nature. Here, we show that analogous input-output rel…
Physical limitations on broadband invisibility based on fast-light media
Mohamed Ismail Abdelrahman, Zeki Hayran, Aobo Chen +1
This note is a comment on a recent article [Tsakmakidis, et al., Nat Commun 10 (2019)] that presents a thought-provoking proposal to overcome the bandwidth restrictions of invisibi…
Capturing Broadband Light in a Compact Bound State in the Continuum
Zeki Hayran, Francesco Monticone
Trapping and storing light for arbitrary time lengths in open cavities is a major goal of nanophotonics, with potential applications ranging from energy harvesting to optical infor…
All-dielectric self-cloaked structures
Zeki Hayran, Ramon Herrero, Muriel Botey +2
While practical realizations of optical invisibility have been achieved so far by various ingenious methods, they generally rely on complex materials which prevent the wide impleme…
Directionality Fields generated by a Local Hilbert Transform
W. W. Ahmed, R. Herrero, M. Botey +3
We propose a new approach based on a local Hilbert transform to design non-Hermitian potentials generating arbitrary vector fields of directionality, p(r), with desired shapes and…
Invisibility on demand based on a generalized Hilbert transform
Zeki Hayran, Ramon Herrero, Muriel Botey +2
Designing invisible objects without the usage of extreme materials is a long-sought goal for photonic applications. Invisibility techniques demonstrated so far typically require hi…
Rainbow Trapping in a Chirped Three-Dimensional Photonic Crystal
Zeki Hayran, Hamza Kurt, Kestutis Staliunas
Light localization and intensity enhancement in a woodpile layer-by-layer photonic crystal, whose interlayer distance along the propagation direction is gradually varied, has been…