Article
Engineering, Electrical & Electronic
Jun Shibayama, Akira Kawahara, Junji Yamauchi, Hisamatsu Nakano
Summary: This paper extends the finite-difference time-domain (FDTD) method based on the iterated Crank-Nicolson (ICN) scheme to a frequency-dependent version. The Drude model is used to describe the metal dispersion and is incorporated into the iterated Crank-Nicolson formulation with the trapezoidal recursive convolution technique. The effectiveness of the FDTD method with convolutional perfectly matched layers is examined through the analysis of a metal-insulator-metal plasmonic waveguide, and the numerical results obtained using a two-iteration technique show good agreement with those from the traditional explicit FDTD method.
ELECTRONICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Christopher Tiburski, Christoph Langhammer
Summary: Alloying is an important method to control the optical properties of metal nanoparticles, with numerous applications in optical metamaterials, nanosensors, and plasmon-enhanced catalysis. It allows for tuning of optical properties without shifting the localized surface plasmon resonance and simultaneously adjusting other properties. However, the impact of alloying on light absorption in metal nanoparticles has not been systematically explored. In this study, we screen the light absorption properties of binary late transition-metal alloys and find that most nanoparticles exhibit maximal absorption efficiency at around 80 nm diameter and alloy systems outperform their constituents with absorption enhancement factors up to 200%.
Article
Engineering, Electrical & Electronic
Abdolkarim Afroozeh
Summary: A novel passive optical-fiber sensor based on surface plasmon resonance (SPR) was proposed and demonstrated, utilizing a configuration on metal-dielectric materials. The refractive index on ring and fiber is controlled by the FDTD method to shift the resonance wavelength of the fiber SPR. The experimental results based on fiber ring resonator show good agreement with numerical and measurements, opening a new path to optical fiber sensors.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Abdolkarim Afroozeh, Behrad Zeinali
Summary: This paper presents a new passive optical fiber sensor based on surface plasmon resonance (SPR) technology, which offers high sensitivity and a wide detection range. By controlling the refractive index, the resonance wavelength of the fiber can be shifted. Experimental results demonstrate the good performance and agreement of this proposed structure.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Gil Cherniak, Moshe Avraham, Sharon Bar-Lev, Gady Golan, Yael Nemirovsky
Summary: This study focuses on the development of a miniature thermal sensor, TMOS, fabricated in advanced CMOS FABs. By utilizing micro- or nano-machining processes, a regular CMOS transistor is transformed into a high-performance sensor. The absorption of electromagnetic radiation by the vacuum-packaged TMOS is studied and optimized, with modeling and simulations based on the LUMERICAL software package.
Article
Physics, Multidisciplinary
Xuehan Liu, Keyang Li, Zhao Meng, Zhun Zhang, Zhongchao Wei
Summary: A subwavelength metamaterial perfect absorber in the optical communication band was proposed and tested, achieving dual-band perfect absorption with high sensitivity to refractive index, making it suitable for applications like plasma sensors and light-wave filters.
FRONTIERS IN PHYSICS
(2021)
Article
Chemistry, Physical
Qinxiu Zhang, Yue Zhang, Tao Xiong, Wei Wang, Cheng Sun
Summary: In this study, a central symmetrical tetramer structure consisting of gold-broken nanorings is proposed and the plasmonic properties of the system in the visible range are investigated using the finite difference time-domain method. The study focuses on quantitatively analyzing the plasmonic scattering efficiency of the system and examining the electric field distributions at resonance wavelengths. By varying the structural parameters, including the relative orientation of the broken angles, the thickness of the broken nanorings, light polarization, and the refractive index of the surrounding environment, it is shown that different plasmonic resonances can be achieved in the gold broken nanorings, allowing for tunability of resonance wavelengths and peak intensities. The findings of this study have potential applications in the design of plasmonic devices operating in the visible wavelength range.
Article
Chemistry, Physical
Yue Zhang, Tao Xiong, Dandan Dong, Wei Wang, Cheng Sun
Summary: This study proposes a graphene-photonic crystal composite structure and investigates its optical properties in the infrared regime. It is shown that the structure is highly sensitive to the adjacent dielectric material and the refractive index of the surrounding environment.
Article
Chemistry, Physical
Yue Zhang, Dandan Dong, Tao Xiong, Wei Wang, Cheng Sun
Summary: In this work, a double-deck structure composed of graphene nanoribbons is proposed, and the plasmonic properties of the system at mid-infrared wavelengths are investigated. Multiple plasmonic resonances are revealed in the double-deck graphenes, and it is shown that these properties can be adjusted by changing the parameters of the graphenes. The double-deck graphene nanoribbon structure proposed in this work may be implemented in designs of plasmonic devices in the mid-infrared regime.
Article
Engineering, Electrical & Electronic
Adam Mock
Summary: Time-domain electromagnetic simulation tools have the advantage of obtaining the entire spectrum in a single simulation run using broadband initial conditions and Fourier transformation. However, when dealing with time-varying materials, Fourier techniques need to be reconsidered. This study demonstrates how a few finite-difference time-domain simulations can be used with broadband initial conditions to obtain scattering spectra in time-modulated resonator systems.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Engineering, Electrical & Electronic
Joshua Baxter, Antonio Cala Lesina, Lora Ramunno
Summary: As nanofabrication techniques advance, modeling nonlocal effects in plasmonics has become increasingly important. This study presents a comprehensive FDTD implementation of nonlocal hydrodynamics with parallel computing, demonstrating the importance of parallel implementation in addressing nonlocal effects and increasing simulation accuracy for metallic particles and nanostructures.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Rodrigo M. S. de Oliveira, Rodrigo R. Paiva
Summary: A central least-squares spatial derivative procedure and LS-FDTD method have been developed to approximate spatial derivatives and attenuate nonphysical modes. The proposed method has been successfully validated for 1-D and 2-D problems with time steps beyond the FDTD CFL limit, demonstrating accuracy and stability conditions for LS-FDTD.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
H. Akafzade, N. Hozhabri, S. C. Sharma
Summary: This study presents a new type of SPR sensor fabricated using a multi-layer nanostructure Ag/Si3N4/Au, showing excellent performance in monitoring relative concentration of glucose. The sensor's performance is significantly enhanced by high strength of the evanescent electric fields associated with surface plasmon resonance, resolving glucose concentrations down to about a percent. Strong evanescent fields with long decay lengths contribute to the sensor's performance, facilitating the detection of changes in optical properties at large distances.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Engineering, Electrical & Electronic
Dip Sarker, Partha Pratim Nakti, Md Ishfak Tahmid, Md Asaduz Zaman Mamun, Ahmed Zubair
Summary: We proposed narrow band tunable terahertz switches based on plasmonic effect and multilayered graphene metamaterial. We designed and simulated four-and eight-state terahertz optical switch designs with high modulation depth and narrow bandwidth. By adjusting the plasmonic bright modes and transparency regions through varying the chemical potential of patterned graphene layers, these structures exhibited high polarization sensitivity and low insertion losses.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Review
Chemistry, Analytical
Chenyu Dong, Yifan Wang, Xiaoyan Zhao, Jie Bian, Weihua Zhang
Summary: Nanostructures and nanomaterials, especially plasmonic nanostructures, have unique optical properties that can manipulate light and enhance light-matter interactions. They have diverse applications in chemical sensing and analysis, improving sensor sensitivity and simplifying instrument design.
