150 citations · 690 across the 27 of their papers we have counts for
19 papers · 1 filter
Analysis of Electromagnetic Scattering from Array of Time-Modulated Graphene Ribbons
Mahdi Rahmanzadeh, Behzad Rejaei, Amin Khavasi
An accurate and fast method is presented for scattering of electromagnetic waves from an array of time-modulated graphene ribbons. We derive a time-domain integral equation for ind…
Steering line waves at a dual metasurface for optical applications
Haddi Ahmadi, Zahra Ahmadi, Nasrin Razmjooei +1
Line waves are defined as confined edge modes propagating at the interface of dual electromagnetic metasurfaces that preserve mirror reflection symmetries. Previous works have theo…
Analytical method for the diffraction of an electromagnetic wave by subwavelength graphene ribbons
Mahdi Rahmanzadeh, Amin Khavasi, Behzad Rejaei
Theoretical study of arrays of graphene ribbons is currently of high interest due to its potential application in beam splitters, absorbers, and polarizers. In this paper, an analy…
Perfect anomalous reflection using compound metallic metagratings
Mahdi Rahmanzadeh, Amin Khavasi
Metagrating is a new concept for wavefront manipulation that, unlike phase gradient metasurfaces, does not suffer from low efficiency and also has a less complicated fabrication pr…
Analog Optical Implementation of Spatial High Pass Filtering Using Evanescent Waves
Ali Pour Mohammad Qoli Vafa, Parisa Karimi, Amin Khavasi
We introduce optical polarization-insensitive high pass filters based on total internal reflection of light at the interface of two dielectric media (1D) and Bragg reflection of a…
An Analytical and Rigorous Method for Analysis of an Array of Magnetically-Biased Graphene Ribbons
Mahdi Rahmanzadeh, Behzad Rejaei, Mohammad Memarian +1
A sheet of graphene under magnetic bias attains anisotropic surface conductivity, opening the door for realizing compact devices such as Faraday rotators, isolators and circulators…
Electromagnetic Field Tapering in the High-Roughness Substrates Coated by a Thin Film of Manganese: A Lithography-Free Approach to Ultra-Broadband, Wide-Angle, UV to FIR Perfect Absorption
Majid Aalizadeh, Mohammad Reza Tavakol, Amin Khavasi +2
Metallic layers are known to be used for the suppression of wave transmission when their thickness is sufficiently higher than the skin depth of metal. If in addition to blocking t…
Designing Dual-Band Absorbers by Graphene/Metallic Metasurfaces
Saeedeh Barzegar-Parizi, Amin Khavasi
This article presents a novel approach for designing dual-band absorbers based on graphene and metallic metasurfaces for terahertz and mid-infrared regimes, respectively. The absor…
A Route to Unusually Broadband Absorption Spanning from Visible to Mid-Infrared
Majid Aalizadeh, Amin Khavasi, Andriy E. Serebryannikov +2
In this paper, a route to ultra-broadband absorption is suggested and demonstrated by a feasible design. The high absorption regime (absorption above 90%) for the suggested structu…
Lithography-Free, Manganese-Based Ultra-Broadband Absorption Through Annealing-Based Deformation of Thin Layers into metal-air composites
Majid Aalizadeh, Amin Khavasi, Bayram Butun +1
Fabrication, characterization, and analysis of an ultra-broadband lithography-free absorber is presented. An over 94% average absorption is experimentally achieved in the wavelengt…
Wideband Antireflection Coating Using Metamaterials
Fahimeh Sepehripour, Parisa Karimi, Amin Khavasi
In this paper, we propose a new approach for realizing antireflection coating using metamaterials. In this approach, a subwavelength array of metallic pillars (with square cross-se…
Temporal Analog Optical Computing using an On-Chip Fully Reconfigurable Photonic Signal Processor
Hossein Babashah, Zahra Kavehvash, Amin Khavasi +1
This paper introduces the concept of on-chip temporal optical computing, based on dispersive Fourier transform and suitably designed modulation module, to perform mathematical oper…
Two Dimensional Edge Detection by Guided Mode Resonant Metasurface
Amirhossein Saba, Mohammad Reza Tavakol, Parisa Karimi-Khoozani +1
In this letter, a new approach to perform edge detection is presented using an all-dielectric CMOS-compatible metasurface. The design is based on guided-mode resonance which provid…
Spatial Integration by a Dielectric Slab Waveguide and its Planar Graphene-based Counterpart
Farzad Zangeneh-Nejad, Amin Khavasi
Motivated by the recent progress in analog computing [Science 343, 160 (2014)], a new approach to perform spatial integration is presented using a dielectric slab waveguide. Our ap…
Accurate Effective Medium Theory for the Analysis of Spoof Localized Surface Plasmons in Textured Metallic Cylinders
Babak Rahmani, Amirmasood Bagheri, Amin Khavasi
It has been recently demonstrated that textured closed surfaces which are made out of perfect electric conductors (PECs) can mimic highly localized surface plasmons (LSPs). Here, w…
Analog Optical Computing by Half-Wavelength Slabs
Farzad Zangeneh-Nejad, Amin Khavasi, Behzad Rejaei
A new approach to perform analog optical differentiation is presented using half-wavelength slabs. First, a half-wavelength dielectric slab is used to design a first order differen…
Effect of Graphene on the Absorption and Extraordinary Transmission of Light in One Dimensional Metallic Gratings
Amirmasood Bagheri, Babak Rahmani, Amin Khavasi
Periodic metallic structures are known to support resonant extraordinary transmission (EOT). When covered with graphene, these structures can be employed to effectively manipulate…
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…
Significant crosstalk reduction using all-dielectric CMOS-compatible metamaterials
Amin Khavasi, Lukas Chrostowski, Zeqin Lu +1
A recent computational result suggests that highly confined modes can be realized by all-dielectric metamaterials (S. Jahani et. al., Optica 1, 96 (2014)). This substantially decre…