445 citations · 2.2k across the 21 of their papers we have counts for
23 papers
Ion-Assisted Nanoscale Material Engineering in Atomic Layers
Hossein Taghinejad, Mohammad Taghinejad, Sajjad Abdollahramezani +11
Achieving deterministic control over the properties of low-dimensional materials with nanoscale precision is a long-sought goal. Mastering this capability has a transformative impa…
Very-Large-Scale-Integrated High- Nanoantenna Pixels (VINPix)
Varun Dolia, Halleh B. Balch, Sahil Dagli +9
Metasurfaces provide a versatile and compact approach to free-space optical manipulation and wavefront shaping. Comprised of arrays of judiciously-arranged dipolar resonators, meta…
Enhanced Meta-Displays Using Advanced Phase-Change Materials
Omid Hemmatyar, Sajjad Abdollahramezani, Ioannis Zeimpekis +12
Structural colors generated due to light scattering from static all-dielectric metasurfaces have successfully enabled high-resolution, high-saturation, and wide-gamut color printin…
Advanced Phase-Change Materials for Enhanced Meta-Displays
Omid Hemmatyar, Sajjad Abdollahramezani, Sergey Lepeshov +4
Structural colors generated due to light scattering from static all-dielectric metasurfaces have successfully enabled high-resolution, high-saturation and wide-gamut color printing…
Electrically driven programmable phase-change meta-switch reaching 80% efficiency
Sajjad Abdollahramezani, Omid Hemmatyar, Mohammad Taghinejad +11
Despite recent advances in active metaoptics, wide dynamic range combined with high-speed reconfigurable solutions is still elusive. Phase-change materials (PCMs) offer a compellin…
Dynamic hybrid metasurfaces
Sajjad Abdollahramezani, Omid Hemmatyar, Mohammad Taghinejad +10
Efficient hybrid plasmonic-photonic metasurfaces that simultaneously take advantage of the potential of both pure metallic and all-dielectric nanoantennas are identified as an emer…
Meta-optics for spatial optical analog computing
Sajjad Abdollahramezani, Omid Hemmatyar, Ali Adibi
Rapidly growing demands for high-performance computing, powerful data processing systems, and big data necessitate the advent of novel optical devices to perform demanding computin…
ITO-Based Microheaters for Reversible Multi-Stage Switching of Phase-Change Materials: Towards Miniaturized Beyond-Binary Reconfigurable Integrated Photonics
Hossein Taghinejad, Sajjad Abdollahramezani, Ali A. Eftekhar +6
Inducing a large refractive-index change is the holy grail of reconfigurable photonic structures, a goal that has long been the driving force behind the discovery of new optical ma…
Tunable nanophotonics enabled by chalcogenide phase-change materials
Sajjad Abdollahramezani, Omid Hemmatyar, Hossein Taghinejad +5
Nanophotonics has garnered intensive attention due to its unique capabilities in molding the flow of light in the subwavelength regime. Metasurfaces (MSs) and photonic integrated c…
Knowledge Discovery In Nanophotonics Using Geometric Deep Learning
Yashar Kiarashinejad, Mohammadreza Zandehshahvar, Sajjad Abdollahramezani +3
We present here a new approach for using the intelligence aspects of artificial intelligence for knowledge discovery rather than device optimization in electromagnetic (EM) nanostr…
Full color generation with Fano-type resonant HfO nanopillars designed by a deep-learning approach
Omid Hemmatyar, Sajjad Abdollahramezani, Yashar Kiarashinejad +2
In contrast to lossy plasmonic metasurfaces (MSs), wideband dielectric MSs comprising of subwavelength nanostructures supporting Mie resonances are of great interest in the visible…
Deep Learning Reveals Underlying Physics of Light-matter Interactions in Nanophotonic Devices
Yashar Kiarashinejad, Sajjad Abdollahramezani, Mohammadreza Zandehshahvar +2
In this paper, we present a deep learning-based (DL-based) algorithm, as a purely mathematical platform, for providing intuitive understanding of the properties of electromagnetic…
Deep learning approach based on dimensionality reduction for designing electromagnetic nanostructures
Yashar Kiarashinejad, Sajjad Abdollahramezani, Ali Adibi
In this paper, we demonstrate a computationally efficient new approach based on deep learning (DL) techniques for analysis, design, and optimization of electromagnetic (EM) nanostr…
Reconfigurable Multifunctional Metasurfaces Employing Hybrid Phase-Change Plasmonic Architecture
Sajjad Abdollahramezani, Hossein Taghinejad, Tianren Fan +3
We present a hybrid device platform for creating an electrically reconfigurable metasurface formed by the integration of plasmonic nanostructures with phase-change material germani…
Statistical Studies of Fading in Underwater Wireless Optical Channels in the Presence of Air Bubble, Temperature, and Salinity Random Variations (Long Version)
Mohammad Vahid Jamali, Ali Mirani, Alireza Parsay +6
Optical signal propagation through underwater channels is affected by three main degrading phenomena, namely absorption, scattering, and fading. In this paper, we experimentally st…
Femtosecond CDMA Using Dielectric Metasurfaces: Design Procedure and Challenges
Taha Rajabzadeh, Mohammad Hosein Mousavi, Sajjad Abdollahramezani +2
Inspired by the ever-increasing demand for higher data transmission rates and the tremendous attention toward all-optical signal processing based on miniaturized nanophotonics, in…
Extending chip-based Kerr-comb to visible spectrum by dispersive wave engineering
Ali Eshaghian Dorche, Sajjad Abdollahramezani, Hossein Taheri +2
Anomalous group velocity dispersion is a key parameter for generating bright solitons, and thus wideband Kerr frequency combs. Extension of frequency combs to visible wavelength in…
Broadband, Polarization-insensitive and Wide-angle Optical Absorber based on Fractal Plasmonics
Ali Eshaghian, Sajjad AbdollahRamezani, Ata Chizari +1
In this paper, a plasmonic absorber consisting of a metal-dielectric-metal stack with a top layer of Sierpinski nanocarpet is theoretically investigated. Such compact absorber depi…
Analog Optical Computing Based on Dielectric Meta-reflect-array
Ata Chizari, Sajjad AbdollahRamezani, Mohammad Vahid Jamali +1
In this paper, we realize the concept of analog computing using an array of engineered gradient dielectric meta-reflect-array. The proposed configuration consists of individual sub…
Analog computing by Brewster effect
Amir Youssefi, Farzad Zangeneh-Nejad, Sajjad AbdollahRamezani +1
Optical computing has emerged as a promising candidate for real-time and parallel continuous data processing. Motivated by recent progresses in metamaterial-based analog computing…
Mining DNA Sequences Based on Spatially Coded Technique Using Spatial Light Modulator
Masoome Fazelian, Sajjad AbdollahRamezani, Sima Bahrani +6
In this paper, we present an optical computing method for string data alignment applicable to genome information analysis. By applying moire technique to spatial encoding patterns…
Statistical Distribution of Intensity Fluctuations for Underwater Wireless Optical Channels in the Presence of Air Bubbles
Mohammad Vahid Jamali, Pirazh Khorramshahi, Arvin Tashakori +6
In this paper, we experimentally investigate the statistical distribution of intensity fluctuations for underwater wireless optical channels under different channel conditions, nam…
Analog Computing Using Graphene-based Metalines
Sajjad AbdollahRamezani, Kamalodin Arik, Amin Khavasi +1
We introduce the new concept of "metalines" for manipulating the amplitude and phase profile of an incident wave locally and independently. Thanks to the highly confined graphene p…