Publications (41)
Analytical solution of linear ordinary differential equations by differential transfer matrix method
Sina Khorasani, Ali Adibi
We report a new analytical method for exact solution of homogeneous linear ordinary differential equations with arbitrary order and variable coefficients. The method is based on th…
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…
Nonlinear Raman Shift Induced by Exciton-to-Trion Transformation in Suspended Trilayer MoS2
Hossein Taghinejad, Mohammad Taghinejad, Alexey Tarasov +6
Layered two-dimensional (2D) semiconductors such as molybdenum disulfide (MoS2) have recently attracted remarkable attention because of their unique physical properties. Here, we u…
High Quality factor micro-ring resonator for strong atom-light interactions using miniature atomic beams
Ali Eshaghian Dorche, Bochao Wei, Chandra Raman +1
An integrated photonic platform is proposed for strong interactions between atomic beams and annealing-free high-quality-factor (Q) microresonators. We fabricated a thin-film, air-…
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…
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…
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…
Inverse Design in Nanophotonics via Representation Learning
Reza Marzban, Ali Adibi, Raphael Pestourie
Inverse design in nanophotonics, the computational discovery of structures achieving targeted electromagnetic (EM) responses, has become a key tool for recent optical advances. Tra…
Large Enhancement of Circular Dichroism Using an Embossed Chiral Metamaterial
S. Hamed Shams Mousavi, Sajanlal R. Panikkanvalappil, Mostafa A. El-Sayed +2
In the close vicinity of a chiral nanostructure, the circular dichroism of a biomolecule could be greatly enhanced, due to the interaction with the local superchiral fields. Modest…
A unified approach to mode splitting and scattering loss in high-Q whispering-gallery-mode microresonators
Qing Li, Ali A. Eftekhar, Zhixuan Xia +1
Current theoretical treatment of mode splitting and scattering loss resulting from sub-wavelength scatterers attached to the surface of high-quality-factor whispering-gallery-mode…
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…
Planar Scale Invariant Waveguides and Resonators with Uniform Air Confined Modes
Mohammad Enjavi, Amin Khavasi, Ashkan Zandi +4
We demonstrate a planar metamaterial based resonator and waveguide with strong light confinement in air based on a silicon-on-insulator (SOI) platform that exhibits scale invarianc…
Deep Active Learning for Lung Disease Severity Classification from Chest X-rays: Learning with Less Data in the Presence of Class Imbalance
Roy M. Gabriel, Mohammadreza Zandehshahvar, Marly van Assen +4
To reduce the amount of required labeled data for lung disease severity classification from chest X-rays (CXRs) under class imbalance, this study applied deep active learning with…
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…
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…
Self-synchronization of Kerr-nonlinear Optical Parametric Oscillators
Hossein Taheri, Pascal Del'Haye, Ali A. Eftekhar +2
We introduce a new, reduced nonlinear oscillator model governing the spontaneous creation of sharp pulses in a damped, driven, cubic nonlinear Schroedinger equation. The reduced mo…
Systematic Design and Demonstration of Multipole, Coupled-Cavity Integrated Photonic Bandpass Filters with High FSR, High-Q Single-Mode Microresonators in Low-Loss Silicon Nitride Platform
Amir H Hosseinnia, Abdel Karim El Amili, Yu-hung Lai +4
Tunable, low-loss, narrowband, and frequency-stabilized filters play a critical role in the realization of transceivers for efficient signal processing in telecommunications and se…
GiBS: Generative Input-side Basis-driven Structures
Reza Marzban, Ashkan Zandi, Ali Adibi
Designing large-scale metasurfaces with nonlocal optical effects remains challenging due to the immense dimensionality and fabrication constraints of conventional optimization meth…
Soliton Formation in Whispering-Gallery-Mode Resonators via Input Phase Modulation
Hossein Taheri, Ali A. Eftekhar, Kurt Wiesenfeld +1
We propose a method for soliton formation in whispering-gallery-mode (WGM) resonators through input phase modulation. Our numerical simulations of a variant of the Lugiato-Lefever…
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…
Self-synchronization Phenomena in the Lugiato-Lefever Equation
Hossein Taheri, Pascal Del'Haye, Ali A. Eftekhar +2
The damped driven nonlinear Schrödinger equation (NLSE) has been used to understand a range of physical phenomena in diverse systems. Studying this equation in the context of opti…
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…
Enhanced Polling and Infiltration for Highly-Efficient Electro-Optic Polymer-Based Mach-Zehnder Modulators
Iman Taghavi, Razi Dehghannasiri, Tianren Fan +7
An ultra-narrow slot waveguide is fabricated for use in highly-efficient, electro-optic-polymer-based, integrated-optic modulators. Measurement results indicate that 's belo…
Bayesian Optimization for Function-Valued Responses under Min-Max Criteria
Pouya Ahadi, Reza Marzban, Ali Adibi +1
Bayesian optimization is widely used for optimizing expensive black box functions, but most existing approaches focus on scalar responses. In many scientific and engineering settin…
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…
Wideband bright soliton frequency comb generation at optical telecommunication wavelength in a thin SiN film
Ali Eshaghian Dorche, Amir Hossein Hosseinnia, Ali Asghar Eftekhar +1
Bright-soliton frequency comb generation in a thin-film silicon nitride (SiN) microresonator at optical telecommunication wavelengths is numerically demonstrated using our recently…
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…
Ultra-compact On-Chip Plasmonic Light Concentrator
Ye Luo, Maysamreza Chamanzar, Ali Adibi
We present a novel approach for achieving tightly concentrated optical field by a hybrid photonic-plasmonic device in an integrated platform, which is a triangle-shaped metal taper…
Manifold Learning for Knowledge Discovery and Intelligent Inverse Design of Photonic Nanostructures: Breaking the Geometric Complexity
Mohammadreza Zandehshahvar, Yashar Kiarashi, Muliang Zhu +3
Here, we present a new approach based on manifold learning for knowledge discovery and inverse design with minimal complexity in photonic nanostructures. Our approach builds on stu…
HiLAB: A Hybrid Inverse-Design Framework
Reza Marzban, Hamed Abiri, Raphael Pestourie +1
HiLAB (Hybrid inverse-design with Latent-space learning, Adjoint-based partial optimizations, and Bayesian optimization) is a new paradigm for inverse design of nanophotonic struct…
Optical bistability in a one-dimensional photonic crystal resonator using a reverse-biased pn-junction
Majid Sodagar, Mehdi Miri, Ali A. Eftekhar +1
Optical bistability provides a simple way to control light with light. We demonstrate low-power thermo-optical bistability caused by the Joule heating mechanism in a one-dimensiona…
PolitiSky24: U.S. Political Bluesky Dataset with User Stance Labels
Peyman Rostami, Vahid Rahimzadeh, Ali Adibi +1
Stance detection identifies the viewpoint expressed in text toward a specific target, such as a political figure. While previous datasets have focused primarily on tweet-level stan…
Multipartite high-dimensional entangled state generation through soliton-induced dynamical Casimir effect on a chip
Ali Eshaghian Dorche, Ali Adibi
An integrated photonic approach for complex quantum state generation through dynamical Casimir effect (DCE) is demonstrated. This approach provides a scheme to realize multipartite…
New Analytical Approach for Computation of Band Structure in One-dimensional Periodic Media
Sina Khorasani, Ali Adibi
In this paper, we present a new approach for the exact calculation of band structure in one-dimensional periodic media, such as photonic crystals and superlattices, based on the re…
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…
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…
Racetrack microresonator based electro-optic phase shifters on a 3C-silicon-carbide-on-insulator platform
Tianren Fan, Xi Wu, Sai R. M. Vangapandu +3
We report the first demonstration of integrated electro-optic (EO) phase shifters based on racetrack microresonators on a 3C-silicon-carbide-on-insulator (SiCOI) platform working a…
Band-edge Bilayer Plasmonic Nanostructure for Surface Enhanced Raman Spectroscopy
S. Hamed Shams Mousavi, Ali A. Eftekhar, Amir H. Atabaki +1
Spectroscopic analysis of large biomolecules is critical in a number of applications, including medical diagnostics and label-free biosensing. Recently, it has been shown that Rama…
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…
Photonic Crystal Microring Resonators on a Hybrid Silicon Nitride-on-Lithium Niobate Platform
Zhongdi Peng, Rakesh Krishna, Xi Wu +3
Photonic-crystal resonators (PhCRs) have been widely used in nonlinear integrated photonics for frequency engineering applications. A microwave-assisted frequency converter based o…
Fluidic Integration of Nanophotonic Devices Using Decomposable Polymers
Ehsan Shah Hosseini, Mehrsa Raeis Zadeh, Paul Kohl +1
Polynorbornene-based decomposable polymer which can be patterned with ultraviolet or electron-beam radiation is used to create micrometer-scale fluidic channels. Silicon nitride su…