scholarly journals Broken symmetry theta-shaped dielectric arrays for a high Q-factor Fano resonance with anapole excitation and magnetic field tunability

OSA Continuum ◽  
2019 ◽  
Vol 2 (2) ◽  
pp. 507 ◽  
Author(s):  
Wudeng Wang ◽  
Xin Zhao ◽  
Li Xiong ◽  
Li Zheng ◽  
Ying Shi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fano Resonance ◽  
Broken Symmetry ◽  
Q Factor ◽  
High Q

scholarly journals Double E-shaped toroidal metasurface with high Q-factor Fano resonance and electromagnetically induced transparency

AIP Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 095011
Author(s):  
Ting Chen ◽  
Tianyu Xiang ◽  
Jianwei Wang ◽  
Tao Lei ◽  
Fushan Lu
Keyword(s):  
Fano Resonance ◽  
Electromagnetically Induced Transparency ◽  
Q Factor ◽  
High Q ◽  
Induced Transparency

scholarly journals High Q-Factor Hybrid Metamaterial Waveguide Multi-Fano Resonance Sensor in the Visible Wavelength Range

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1583
Author(s):  
Hongyan Yang ◽  
Yupeng Chen ◽  
Mengyin Liu ◽  
Gongli Xiao ◽  
Yunhan Luo ◽  
...  
Keyword(s):  
Quality Factor ◽  
Wavelength Range ◽  
Fano Resonance ◽  
Q Factor ◽  
High Q ◽  
Visible Wavelength ◽  
Metamaterial Waveguide ◽  
Visible Wavelength Range ◽  
Resonance Sensor ◽  
Hybrid Metamaterial

We propose a high quality-factor (Q-factor) multi-Fano resonance hybrid metamaterial waveguide (HMW) sensor. By ingeniously designing a metal/dielectric hybrid waveguide structure, we can effectively tailor multi-Fano resonance peaks’ reflectance spectrum appearing in the visible wavelength range. In order to balance the high Q-factor and the best Fano resonance modulation depth, numerical calculation results demonstrated that the ultra-narrow linewidth resolution, the single-side quality factor, and Figure of Merit (FOM) can reach 1.7 nm, 690, and 236, respectively. Compared with the reported high Q-value (483) in the near-infrared band, an increase of 30% is achieved. Our proposed design may extend the application of Fano resonance in HMW from mid-infrared, terahertz band to visible band and have important research value in the fields of multi-wavelength non-labeled biosensing and slow light devices.

scholarly journals Dynamically tunable Fano resonance with high Q factor based on asymmetric Dirac semimetal split-ring structure

2020 ◽  
Vol 7 (2) ◽  
pp. 025041
Author(s):  
Shuai Yan ◽  
Shijie Song ◽  
Huiyun Zhang ◽  
Yuping Zhang
Keyword(s):  
Fano Resonance ◽  
Ring Structure ◽  
Q Factor ◽  
Split Ring ◽  
High Q ◽  
Dirac Semimetal

scholarly journals Active Switching of Extremely High-Q Fano Resonances Using Vanadium Oxide-Implanted Terahertz Metamaterials

2020 ◽  
Vol 10 (1) ◽  
pp. 330
Author(s):  
Jing Ma ◽  
Zhi-Hang Wang ◽  
Huan Liu ◽  
Ya-Xian Fan ◽  
Zhi-Yong Tao
Keyword(s):  
Vanadium Oxide ◽  
Fano Resonance ◽  
Surface Current ◽  
Switching Behavior ◽  
Temperature Sensitive ◽  
Q Factor ◽  
Fano Resonances ◽  
Thermally Induced ◽  
High Q ◽  
Order Of Magnitude

In this paper, we demonstrate an active switching of extremely high Q-factor Fano resonances using vanadium oxide (VO2)-implanted THz asymmetric double C-shaped metamaterial (MM) structures. The simulation results indicate the highly temperature-sensitive nature of the double Fano resonances that can be switched at very low external thermal pumping (68 °C), which is only slightly higher than room temperature. We employ the surface current and electric field distributions of the structure to analyze the physical mechanism of the observed switching behavior in the thermally excited Fano MMs. More importantly, by optimizing the asymmetric parameter (offset length), the linewidth of the Fano resonance can reach only 0.015 THz and the Q-factor is as high as 98, which is one order of magnitude higher than that of the traditional MMs. The findings of this work would enable a thermally-induced high-Q Fano resonance MMs for ultra-sensitive sensors, modulators, low threshold switching in metadevices.

scholarly journals New EM Transmitter with Y3Fe5O12 Based Magnetic Feeders Potentially Used for Seabed Logging Application

2013 ◽  
Vol 667 ◽  
pp. 10-23 ◽  
Author(s):  
Majid Niaz Akhtar ◽  
Noorhana Yahya ◽  
Nadeem Nasir
Keyword(s):  
Magnetic Field ◽  
Yttrium Iron Garnet ◽  
Sintering Temperature ◽  
Q Factor ◽  
Yttrium Iron ◽  
Garnet Phase ◽  
High Q ◽  
Hydrocarbon Reservoir ◽  
Sea Bed ◽  
Iron Garnet

Sea bed logging (SBL) is a new technique for detection of deep target hydrocarbon reservoir. Powerful electromagnetic (EM) transmitter is required for the transmission of EM signal underneath the seabed. New aluminum transmitter with yttrium iron garnet (Y3Fe5O12) based magnetic feeders was used in a scale tank to increase the magnitude of the magnetic field. Yttrium iron garnet samples were prepared using self combustion technique at different sintering temperatures of 750°C, 950°C and 1150°C. Characterizations of Y3Fe5O12 samples were done by using XRD, RAMAN, FESEM and Impedence network analyser. X-ray diffraction results revealed that yttrium iron garnet phase with good crystallinity appeared at sintering temperature of 1150°C. Nanoparticles size ranging from 60 to 110 nm was investigated. Raman results also confirmed garnet structure of yttrium iron garnet at sintering temperature of 1150°C. Field emission scanning electron microscopy (FESEM) was used to image the morphology of the Y3Fe5O12 nanoparticles. Magnetic properties of Y3Fe5O12 magnetic feeders illustrates that Y3Fe5O12 has high Initial permeability (58.054), high Q-factor (59.842) and low loss factor (0.0003) at sintering temperature of 1150°C. Y3Fe5O12 magnetic feeders with high Q factor were chosen for new aluminum EM transmitter. Experiments with a scale factor of 2000 were carried out in scaled tank. It was found that Al transmitter with Y3Fe5O12 magnetic feeders increased magnitude of magnetic field strength up to 180%.

scholarly journals High-Q-Factor Tunable Silica-Based Microring Resonators

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 256
Author(s):  
Yue-Xin Yin ◽  
Xiao-Pei Zhang ◽  
Xiao-Jie Yin ◽  
Yue Li ◽  
Xin-Ru Xu ◽  
...  
Keyword(s):  
Optical Communications ◽  
Microring Resonator ◽  
Microring Resonators ◽  
Q Factor ◽  
Notch Depth ◽  
Critical Coupling ◽  
Practical Application ◽  
Coupling Condition ◽  
High Q ◽  
Racetrack Resonator

A high-Q-factor tunable silica-based microring resonator (MRR) is demonstrated. To meet the critical-coupling condition, a Mach–Zehnder interferometer (MZI) as the tunable coupler was integrated with a racetrack resonator. Then, 40 mW electronic power was applied on the microheater on the arm of MZI, and a maximal notch depth of about 13.84 dB and a loaded Q factor of 4.47 × 106 were obtained. The proposed MRR shows great potential in practical application for optical communications and integrated optics.

Dielectric-loaded L-band filters for high-power space applications

2021 ◽  
pp. 1-11
Author(s):  
Paolo Vallerotonda ◽  
Fabrizio Cacciamani ◽  
Luca Pelliccia ◽  
Alessandro Cazzorla ◽  
Davide Tiradossi ◽  
...  
Keyword(s):  
High Power ◽  
Dielectric Resonators ◽  
Q Factor ◽  
Rf Power ◽  
Space Applications ◽  
High Q ◽  
Critical Issues ◽  
L Band ◽  
Multipactor Discharge ◽  
Filter Response

Abstract The design and first experimental results of Tx and Rx L-band bandpass filters for a high-power satellite diplexer are presented in this paper. Designed in the framework of an ESA ARTES AT project, the filters are based on TM010 mode dielectric resonators. These resonators allow for better results in terms of volume occupation with respect to other dielectric resonators still maintaining high Q-factor values (>2000). Volume saving above 30% is achieved with respect to standard coaxial filters. The filter geometries and materials have been chosen in order to improve the power-handling and to cope with related critical issues for space applications (i.e. avoid any multipactor discharge in the operating RF power range and low-PIM response). Measurements of Tx filter show good correlation with the design in terms of central frequency, BW, and unloaded Q-factor (almost 3000). Measurements of Rx filter show a worse correlation with the design in terms of filter response shape. This is ascribed to size tolerances of one of the filter resonators. Multiple analyses are ongoing to remove this degradation in the final engineering model.

High sensitivity and high Q-factor nanoslotted parallel quadrabeam photonic crystal cavity for real-time and label-free sensing

2014 ◽  
Vol 105 (6) ◽  
pp. 063118 ◽  
Author(s):  
Daquan Yang ◽  
Shota Kita ◽  
Feng Liang ◽  
Cheng Wang ◽  
Huiping Tian ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Real Time ◽  
High Sensitivity ◽  
Q Factor ◽  
Label Free ◽  
Photonic Crystal Cavity ◽  
High Q
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