Results 21 to 30 of about 12,562 (253)

Selective Properties of Mid-Infrared Tamm Phonon-Polaritons Emitter with Silicon Carbide-Based Structures

Micromachines, 2022
Electromagnetic (EM) absorbers and emitters have attracted much interest because of their versatile applications. A photonic heterostructure composed of silicon carbide (SiC) layer/germanium (Ge) cavity/distributed Bragg reflector (DBR) has been proposed.
Chengxuan Gong, Gaige Zheng
doaj   +1 more source

Rigorous coupled-wave analysis of liquid crystal polarization gratings

Optics Express, 2020
Several types of liquid crystal polarization gratings (LCPGs) can be achieved depending on their molecular configurations and diffraction properties. We perform detailed numerical studies of these LCPGs based on the rigorous coupled-wave analysis (RCWA) approach.
Jianghao Xiong, Shin-Tson Wu
openaire   +2 more sources

Global rigorous coupled wave analysis for design of multilayer metasurface absorbers

Optics Express, 2023
In this work, a novel Global NV-ETM RCWA method is proposed to accelerate the optimization of the periodic stepped radar absorbing structure. This method is based on the rigorous coupled-wave analysis (RCWA) utilizing the normal vector field (NV) and enhanced transmittance matrix (ETM) approach.
Lin Wang, Debao Fang, Haibo Jin, Jingbo Li   +3 more
openaire   +2 more sources

Effective spectral optical functions of lamellar nanogratings [PDF]

Journal of the European Optical Society-Rapid Publications, 2006
Spectral properties of lamellar sub-wavelength gratings (nanogratings) are described by effective medium approximation (EMA). Analytical spectral formulae for ordinary and extraordinary effective optical functions are derived for nanogratings consisting ...
Foldyna Martin, Postava Kamil, Ossikovski Razvigor, De Martino Antonello, Garcia-Caurel Enric   +4 more
doaj   +1 more source

Measurement of refractive indices of tunicates’ tunics: light reflection of the transparent integuments in an ascidian Rhopalaea sp. and a salp Thetys vagina

Zoological Letters, 2017
Background Tunic is a cellulosic, integumentary matrix found in tunicates (Subphylum Tunicata or Urochordata). The tunics of some ascidian species and pelagic tunicates, such as salps, are nearly transparent, which is useful in predator avoidance ...
Hiroshi Kakiuchida, Daisuke Sakai, Jun Nishikawa, Euichi Hirose   +3 more
doaj   +1 more source

Three-Method Hybrid Numerical Simulation for Surface-Plasmon-Enhanced GaInN-Based Light-Emitting Diodes with Metal-Embedded Nanostructures

Frontiers in Physics, 2021
In this paper, a hybrid numerical simulation tool is introduced and performed for GaInN-based light-emitting diodes (LEDs) with metal-embedded nanostructure to theoretically predict external quantum efficiency (EQE), which composed of finite-difference ...
Ryoya Hiramatsu, Ryo Takahashi, Ryoto Fujiki, Keisuke Hozo, Kanato Sawai, Dong-Pyo Han, Motoaki Iwaya, Tetsuya Takeuchi, Satoshi Kamiyama, Isamu Akasaki, Isamu Akasaki   +10 more
doaj   +1 more source

Fabrication of perfect plasmonic absorbers for blue and near-ultraviolet lights using double-layer wire-grid structures

Journal of the European Optical Society-Rapid Publications, 2021
This study proposes using double-layer wire-grid structures to create narrow-band, perfect plasmonic absorbers, which depend on polarization, for the short-wavelength visible and near-ultraviolet regions of the electromagnetic spectrum.
Atsushi Motogaito, Ryoga Tanaka, Kazumasa Hiramatsu   +2 more
doaj   +1 more source

Symmetry Breaking as a Basis for Characterization of Dielectric Materials

Sensors
This paper introduces a novel method for measuring the dielectric permittivity of materials within the microwave and millimeter wave frequency ranges. The proposed approach, classified as a guided wave transmission system, employs a periodic transmission
Dubravko Tomić, Zvonimir Šipuš
doaj   +1 more source

Glide-Shifted Dielectric Gratings for Independent Leakage and Phase Tuning in Leaky-Wave Antennas

IEEE Open Journal of Antennas and Propagation
This paper presents a comprehensive analysis of grounded glide-shifted dielectric periodic structures and their application to the design of leaky-wave antennas (LWAs).
Dubravko Tomic, Francisco Mesa, Zvonimir Sipus   +2 more
doaj   +1 more source

Rigorous coupled-wave analysis of antireflective surface-relief gratings [PDF]

Journal of the Optical Society of Korea, 1997
Rigorous coupled-wave analysis (RCWA) with a simplified eigenvalue problem is used to investigate the an-tireflective property of one-dimensional surface-relief gratings such as binary gratings, triangular gratings and gratings with triangle-like surface profiles. The convergence of RCWA is investigated by varying the number of layers and the number of
Chang-Wook Han, Doo-Jin Cho, Bum-Ku Rhee
openaire   +1 more source