scholarly journals Multiple Fano resonances with flexible tunablity based on symmetry-breaking resonators

2019 ◽  
Vol 10 ◽  
pp. 2459-2467 ◽  
Author(s):  
Xiao bin Ren ◽  
Kun Ren ◽  
Ying Zhang ◽  
Cheng guo Ming ◽  
Qun Han
Keyword(s):  
Symmetry Breaking ◽  
Regular Ring ◽  
Ring Resonator ◽  
Structural Parameters ◽  
Ring Cavity ◽  
Resonant Mode ◽  
Fano Resonances ◽  
Resonant Modes ◽  
On Chip ◽  
Mode Order

A symmetry-breaking nanostructure is proposed to achieve multiple Fano resonances. The nanostructure consists of an asymmetric ring resonator coupled to a plasmonic waveguide. The broken symmetry is introduced by deviating the centers of regular ring. New resonant modes that are not accessible through a regular symmetric ring cavity are excited. Thus, one asymmetric cavity can provide more than one resonant mode with the same mode order. As a result, the interval of Fano resonances is greatly reduced. By combining different rings with different degrees of asymmetry, multiple Fano resonances are generated. Those Fano resonances have different dependences on structural parameters due to their different physical origin. The resonance frequency and resonance peak number can be arbitrarily adjusted by changing the degree of asymmetry. This research may provide new opportunities to design on-chip optical devices with great tuning performance.

scholarly journals Multiple Fano resonances with flexible tunablity based on symmetry-breaking resonators

2019 ◽  
Author(s):  
Xiao bin Ren ◽  
Kun Ren ◽  
Ying Zhang ◽  
Cheng guo Ming ◽  
Qun Han
Keyword(s):  
Symmetry Breaking ◽  
Regular Ring ◽  
Ring Resonator ◽  
Structural Parameters ◽  
Ring Cavity ◽  
Resonant Mode ◽  
Fano Resonances ◽  
Resonant Modes ◽  
On Chip ◽  
Mode Order

A symmetry-breaking nanostructure is proposed to achieve multiple Fano resonances. The nanostructure consists of an asymmetric ring resonator coupled to a plasmonic waveguide. The broken symmetry is introduced by deviating the centers of regular ring. New resonant modes those are not accessible to regular symmetric ring cavity are excited. Thus one asymmetric cavity can provide more than one resonant mode with the same mode order. As a result, the interval of Fano resonances is greatly reduced. By combining different rings with different asymmetric, multiple Fano resonances are generated. Those Fano resonances have different dependence on structural parameters due to their different physical origin. The resonance frequency and resonance peak number can be arbitrarily adjusted by changing the degree of asymmetry. This research may provide new opportunities to design on-chip optical devices with great tuning performance.

scholarly journals Graphene Multiple Fano Resonances Based on Asymmetric Hybrid Metamaterial

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2408
Author(s):  
Zhendong Yan ◽  
Zhixing Zhang ◽  
Wei Du ◽  
Wenjuan Wu ◽  
Taoping Hu ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Resonant Mode ◽  
Split Ring Resonator ◽  
Graphene Nanoribbon ◽  
Fano Resonances ◽  
Dark Mode ◽  
Split Ring ◽  
Tunable Sensors ◽  
Asymmetric Hybrid ◽  
Hybrid Metamaterial

We theoretically investigate multiple Fano resonances in an asymmetric hybrid graphene–metal metamaterial. The multiple Fano resonances emerge from the coupling of the plasmonic narrow bonding and antibonding modes supported by an in-plane graphene nanoribbon dimer with the broad magnetic resonance mode supported by a gold split-ring resonator. It is found that the Fano resonant mode with its corresponding dark mode of the antibonding mode in the in-plane graphene nanoribbon dimer is only achieved by structural symmetry breaking. The multiple Fano resonances can be tailored by tuning the structural parameters and Fermi levels. Active control of the multiple Fano resonances enables the proposed metamaterial to be widely applied in optoelectronic devices such as tunable sensors, switches, and filters.

scholarly journals Silicon-Based TM0-to-TM3 Mode-Order Converter Using On-Chip Shallowly Etched Slot Metasurface

Photonics ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 95
Author(s):  
Chenxi Zhu ◽  
Yin Xu ◽  
Zhe Kang ◽  
Xin Hu ◽  
Yue Dong ◽  
...  
Keyword(s):  
Structural Parameters ◽  
Refractive Index Distribution ◽  
Silicon Waveguide ◽  
Mode Division Multiplexing ◽  
Index Distribution ◽  
On Chip ◽  
Silicon Based ◽  
Mode Order ◽  
Multimode Applications ◽  
Fabrication Tolerance

Mode-order converters drive the on-chip applications of multimode silicon photonics. Here, we propose a TM0-to-TM3 mode-order converter by leveraging a shallowly etched slot metasurface pattern atop the silicon waveguide, rather than as some previously reported TE-polarized ones. With a shallowly etched pattern on the silicon waveguide, the whole waveguide refractive index distribution and the corresponding field evolution will be changed. Through further analyses, we have found the required slot metasurface pattern for generating the TM3 mode with high conversion efficiency of 92.9% and low modal crosstalk <−19 dB in a length of 17.73 μm. Moreover, the device’s working bandwidth and the fabrication tolerance of the key structural parameters are analyzed in detail. With these features, such devices would be beneficial for the on-chip multimode applications such as mode-division multiplexing transmission.

scholarly journals Tuning Multiple Fano Resonances for On-Chip Sensors in a Plasmonic System

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1559 ◽  
Author(s):  
Shilin Yu ◽  
Tonggang Zhao ◽  
Jianguo Yu ◽  
Dafa Pan
Keyword(s):  
Slow Light ◽  
Ring Cavity ◽  
Metal Structure ◽  
Refractive Index Sensor ◽  
Fano Resonances ◽  
Metal Insulator Metal ◽  
High Efficient ◽  
On Chip ◽  
Resonator System ◽  
Nonlinear Devices

This paper proposed a plasmonic resonator system, consisting of a metal-insulator-metal structure and two stubs, and a Fano resonance arose in its transmittance, which resulted from the coupling between the two stubs. On the basis of the proposed structure, a circle and a ring cavity are separately added above the stubs to create different coupled plasmonic structures, providing triple and quadruple Fano resonances, respectively. Additionally, by adjusting the geometric parameters of the system, multiple Fano Resonances obtained can be tuned. The proposed structure can be served as a high efficient refractive index sensor, yielding a sensitivity of 2000 nm/RIU and figure of merit (FOM) of 4.05 × 10 4 and performing better than most of the similar structures. It is believed that the proposed structure may support substantial applications for on-chip sensors, slow light and nonlinear devices in highly integrated photonic circuits.

scholarly journals A topological photonic ring-resonator for on-chip channel filters

2021 ◽  
pp. 1-1
Author(s):  
Linpeng Gu ◽  
Yuan Qingchen ◽  
Qiang Zhao ◽  
Ji Yafei ◽  
Liu Ziyu ◽  
...  
Keyword(s):  
Ring Resonator ◽  
On Chip ◽  
Channel Filters

scholarly journals Topology Design of Digital Metamaterials for Ultra-Compact Integrated Photonic Devices Based on Mode Manipulation

2021 ◽  
Author(s):  
Han Ye ◽  
Yanrong Wang ◽  
Shuhe Zhang ◽  
Danshi Wang ◽  
Yumin Liu ◽  
...  
Keyword(s):  
Photonic Devices ◽  
Topology Design ◽  
Functional Region ◽  
Optical Interconnections ◽  
Silicon Waveguide ◽  
All Optical ◽  
On Chip ◽  
Mode Order

Precise manipulation of mode order in silicon waveguide plays a fundamental role in the on-chip all-optical interconnections and is still a tough task in design when the functional region is...

scholarly journals Design and Analysis of $D$ -Band On-Chip Modulator and Signal Source Based on Split-Ring Resonator

2019 ◽  
Vol 27 (7) ◽  
pp. 1513-1526 ◽  
Author(s):  
Yuan Liang ◽  
Chirn Chye Boon ◽  
Chenyang Li ◽  
Xiao-Lan Tang ◽  
Herman Jalli Ng ◽  
...  
Keyword(s):  
Ring Resonator ◽  
Split Ring Resonator ◽  
Signal Source ◽  
Split Ring ◽  
On Chip

Design of a High-Quality Optical Filter Based on 2D Photonic Crystal Ring Resonator for WDM Systems

2020 ◽  
Vol 41 (4) ◽  
pp. 355-361
Author(s):  
Vahid Fallahi ◽  
Mahmood Seifouri
Keyword(s):  
Photonic Crystal ◽  
Quality Factor ◽  
Transmission Coefficient ◽  
Lattice Constant ◽  
Ring Resonator ◽  
Photonic Band Gap ◽  
Structural Parameters ◽  
Optical Filter ◽  
Expansion Method ◽  
Square Lattice

AbstractIn this article, a 2D photonic crystal (PC)-based optical filter has been designed using a PC ring resonator. The resonator used is of square type with a square lattice constant, which has been designed by increasing the radius of the inner rods of the resonator. The filter designed can separate the light of the wavelength of 1545.3 nm with a transmission coefficient of 98 %. The bandwidth of the above wavelength is equal to 0.5 nm and hence the quality factor of the device at this wavelength is equal to 3091. The effects of the structural parameters, such as the refractive index, the lattice constant, the radius of the dielectric rods, the radius of the inner rods of the resonator on the behavior of the proposed device, are fully investigated. To obtain the photonic band gap, the plane wave expansion method is used. In addition, the finite difference time domain method is used to examine, simulate, and to obtain the output spectrum of the structure. The designed structure has both high transmission coefficient and quality factor. Comparatively speaking, it is also simple to design which justifies its use in other photonic crystal-based optical devices.

Magnetic modulation of Fano resonances in optically thin terahertz superlattice metasurfaces

2021 ◽  
Author(s):  
Subhajit Karmakar ◽  
Ravi Varshney ◽  
Dibakar Roy Chowdhury
Keyword(s):  
Magnetic Field ◽  
Free Space ◽  
Skin Depth ◽  
Electromagnetic Energy ◽  
Magnetic Control ◽  
Fano Resonances ◽  
Electromagnetic Responses ◽  
On Chip ◽  
Magneto Resistance ◽  
Sub Wavelength

Abstract Optically thin metasurfaces operating at sub-skin depth thicknesses are intriguing because of its associated low plasmonic losses (compared to optically thick, beyond skin-depth metasurfaces). However, their applicability has been restricted largely because of reduced free space coupling with incident radiations resulting in limited electromagnetic responses. To overcome such limitations, we propose enhancement of effective responses (resonances) in sub-skin depth metasurfaces through incorporation of magneto-transport (Giant Magneto Resistance, GMR) concept. Here, we experimentally demonstrate dynamic magnetic modulation of structurally asymmetric metasurfaces (consisting of superlattice arrangement of thin (~ 10 nm each) magnetic (Ni)/ nonmagnetic (Al) layers) operating at terahertz (THz) domain. With increasing magnetic field (applied from 0 to 30 mT approximately, implies increasing superlattice conductivity), we observe stronger confinement of electromagnetic energy at the resonances (both in dipole and Fano modes). Therefore, this study introduces unique magnetically reconfigurable ability in Fano resonant THz metamaterials, which directly improves its performances operating in the sub-skin depth regime. Our study can be explained by spin-dependent terahertz magneto-transport phenomena in metals and can stimulate the paradigm for on-chip spin-based photonic technology enabling dynamic magnetic control over compact, sub-wavelength, sub-skin depth metadevices.

On chip fast FBG interrogator based on a Silicon on Insulator ring resonator add/drop filter

2021 ◽  
Author(s):  
L. Tozzetti ◽  
A. Giacobbe ◽  
F. Di Pasquale ◽  
S. Faralli
Keyword(s):  
Ring Resonator ◽  
Silicon On Insulator ◽  
On Chip
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