scholarly journals Tailoring Topological Edge States with Photonic Crystal Nanobeam Cavities

2020 ◽  
Author(s):  
Yongkang Gong ◽  
Liang Guo ◽  
Stephan Wong ◽  
Anthony Bennett ◽  
Sang Soon Oh
Keyword(s):  
Photonic Crystal ◽  
Mode Coupling ◽  
Hole Array ◽  
Edge States ◽  
One Dimensional ◽  
Additional Degree ◽  
Wide Range ◽  
Nanobeam Cavities ◽  
Ssh Model ◽  
Significant Attention

Abstract The realization of topological edge states (TESs) in photonic systems has provided unprecedented opportunities for manipulating light in novel manners. The Su-Schrieffer Heeger (SSH) model has recently gained significant attention and has been exploited in a wide range of photonic platforms to create TESs. We develop a photonic topological insulator strategy based on SSH photonic crystal nanobeam cavities. In contrast to the conventional photonic SSH schemes which are based on alternately tuned coupling rength in one dimensional lattice, our proposal provides higher flexibility and allows tailoring TESs by manipulating mode coupling in a two-dimensional manner. We reveal that the proposed hole array based nanobeams in a dielectric membrane can selectively tailor single or double TESs in the telecommunication region by controlling the coupling strength of the adjacent SSH nanobeams in both vertical and horizontal directions. Our finding provides an additional degree of freedom in exploiting the SSH model for integrated topological hotonic devices and functionalities based on the well-established photonic crystal nanobeam cavity platforms.

scholarly journals Tailoring topological edge states with photonic crystal nanobeam cavities

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yongkang Gong ◽  
Liang Guo ◽  
Stephan Wong ◽  
Anthony J. Bennett ◽  
Sang Soon Oh
Keyword(s):  
Photonic Crystal ◽  
Coupling Strength ◽  
Photonic Devices ◽  
Hole Array ◽  
Edge States ◽  
Additional Degree ◽  
Wide Range ◽  
Nanobeam Cavities ◽  
Ssh Model ◽  
Significant Attention

AbstractThe realization of topological edge states (TESs) in photonic systems has provided unprecedented opportunities for manipulating light in novel manners. The Su–Schrieffer–Heeger (SSH) model has recently gained significant attention and has been exploited in a wide range of photonic platforms to create TESs. We develop a photonic topological insulator strategy based on SSH photonic crystal nanobeam cavities. In contrast to the conventional photonic SSH schemes which are based on alternately tuned coupling strength in one-dimensional lattice, our proposal provides higher flexibility and allows tailoring TESs by manipulating mode coupling in a two-dimensional manner. We reveal that the proposed hole-array based nanobeams in a dielectric membrane can selectively tailor single or double TESs in the telecommunication region by controlling the coupling strength of the adjacent SSH nanobeams in both transverse and axial directions. Our finding provides an additional degree of freedom in exploiting the SSH model for integrated topological photonic devices and functionalities based on the well-established photonic crystal nanobeam cavity platforms.

Robust topological edge states from one-dimensional diatomic chain photonic crystals

2021 ◽  
pp. 2150146
Author(s):  
Yun-Tuan fang ◽  
Xiao-Xue Li ◽  
Li-Xia Yang
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystals ◽  
Edge State ◽  
Unit Cell ◽  
Topological Phase ◽  
Edge States ◽  
One Dimensional ◽  
Diatomic Chain ◽  
Ssh Model ◽  
Unit Cell Length

The Su–Schrieffer–Heeger (SSH) model can occur in a one-dimensional (1D) diatomic chain photonic crystal (PC) in which a unit cell includes two same slabs (atoms). With different intervals of the two slabs, the two combined 1D PCs can support topological edge states in all photonic boundary bandgaps. These topological edge states come from the inversion of topological phase of the bands through the band folding effect. When the sum of the two atom intervals in the two different 1D PCs equals to the unit cell length, these edge state frequencies keep invariant.

scholarly journals Photonic Crystal Enhanced by Metamaterial for Measuring Electric Permittivity in GHz Range

Photonics ◽  
2021 ◽  
Vol 8 (10) ◽  
pp. 416
Author(s):  
Arafa H. Aly ◽  
Ayman A. Ameen ◽  
M. A. Mahmoud ◽  
Z. S. Matar ◽  
M. Al-Dossari ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Data Transfer ◽  
Defect Layer ◽  
5G Networks ◽  
One Dimensional ◽  
Design Structure ◽  
Wide Range ◽  
Main Component ◽  
The Impact

The rise of broadband cellular networks and 5G networks enable new rates of data transfer. This paper introduces a new design to measure the permittivity in the GHz range of non-magnetic materials. We tested the proposed design with a wide range of materials such as wood, glass, dry concrete, and limestone. The newly proposed design structure has a maximum sensitivity of 0.496 GHz/RIU. Moreover, it can measure permittivities in the range from 1 up to 9. The main component of the designed structure is a defective one-dimensional photonic crystal with a unit cell consisting of metamaterial and silicon. In addition, we demonstrate the role of the metamaterial in enhancing the proposed design and examine the impact of the defect layer thickness on the proposed structure.

scholarly journals Wide Range Temperature Sensors Based on One-Dimensional Photonic Crystal with a Single Defect

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Arun Kumar ◽  
Vipin Kumar ◽  
B. Suthar ◽  
A. Bhargava ◽  
Kh. S. Singh ◽  
...  
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Defect Mode ◽  
Temperature Dependent ◽  
Defect Modes ◽  
Central Wavelength ◽  
One Dimensional ◽  
Dimensional Photonic Crystal ◽  
Single Defect ◽  
Wide Range

Transmission characteristics of one-dimensional photonic crystal structure with a defect have been studied. Transfer matrix method has been employed to find the transmission spectra of the proposed structure. We consider a Si/air multilayer system and refractive index of Si layer has been taken as temperature dependent. As the refractive index of Si layer is a function of temperature of medium, so the central wavelength of the defect mode is a function of temperature. Variation in temperature causes the shifting of defect modes. It is found that the average change or shift in central wavelength of defect modes is 0.064 nm/K. This property can be exploited in the design of a temperature sensor.

One-dimensional photonic crystal nanobeam cavities

2012 ◽  
pp. 421-446
Author(s):  
J. Hendrickson ◽  
A. Homyk ◽  
A. Scherer ◽  
T. Alasaarela ◽  
A. Säynätjoki ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
One Dimensional ◽  
Dimensional Photonic Crystal ◽  
Nanobeam Cavities

scholarly journals Voltage-induced defect mode coupling in a one-dimensional photonic crystal with a twisted-nematic defect layer

2012 ◽  
Vol 85 (1) ◽  
Author(s):  
Ivan V. Timofeev ◽  
Yu-Ting Lin ◽  
Vladimir A. Gunyakov ◽  
Sergey A. Myslivets ◽  
Vasily G. Arkhipkin ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Mode Coupling ◽  
Defect Mode ◽  
Defect Layer ◽  
One Dimensional ◽  
Dimensional Photonic Crystal ◽  
Twisted Nematic

Splitting and Filtering Properties of Defect-Mode in One-Dimensional Photonic Crystal

2013 ◽  
Vol 760-762 ◽  
pp. 378-382
Author(s):  
Jian Kun Peng ◽  
Yan Ling Han ◽  
Hong Wang
Keyword(s):  
Refractive Index ◽  
Photonic Crystal ◽  
Mode Coupling ◽  
Incident Angle ◽  
Defect Mode ◽  
Defect Modes ◽  
One Dimensional ◽  
Mode Split ◽  
Spacing Interval ◽  
Coupling Mode

By the Transfer Matrix Method (TMM), the properties of defect modes, such as splitting, coupling and filtering, have been researched in detail. The influence of refractive index and incident angle on the defect-mode coupling has been investigated. Simulating results exhibit that coupling mode split as two defect modes when they are close to each other. This property is closely related to the refractive index and the spacing interval between defect layers. The incident angle can reach 30 degree, which has a potential application in full angle filtering.

Bound states in the continuum in double-hole array perforated in a layer of photonic crystal slab

2019 ◽  
Vol 12 (12) ◽  
pp. 125002 ◽  
Author(s):  
Suxia Xie ◽  
Changzhong Xie ◽  
Song Xie ◽  
Jie Zhan ◽  
Zhijian Li ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Bound States ◽  
Hole Array ◽  
Photonic Crystal Slab ◽  
The Continuum

scholarly journals Photonic Crystal Nanobeam Cavities for Nanoscale Optical Sensing: A Review

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 72 ◽  
Author(s):  
Da-Quan Yang ◽  
Bing Duan ◽  
Xiao Liu ◽  
Ai-Qiang Wang ◽  
Xiao-Gang Li ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Optical Waveguides ◽  
Optical Sensing ◽  
Early Stage ◽  
Disease Diagnosis ◽  
Label Free ◽  
Quality Factors ◽  
Integrated Sensor ◽  
Early Stage Disease ◽  
Wide Range

The ability to detect nanoscale objects is particular crucial for a wide range of applications, such as environmental protection, early-stage disease diagnosis and drug discovery. Photonic crystal nanobeam cavity (PCNC) sensors have attracted great attention due to high-quality factors and small-mode volumes (Q/V) and good on-chip integrability with optical waveguides/circuits. In this review, we focus on nanoscale optical sensing based on PCNC sensors, including ultrahigh figure of merit (FOM) sensing, single nanoparticle trapping, label-free molecule detection and an integrated sensor array for multiplexed sensing. We believe that the PCNC sensors featuring ultracompact footprint, high monolithic integration capability, fast response and ultrahigh sensitivity sensing ability, etc., will provide a promising platform for further developing lab-on-a-chip devices for biosensing and other functionalities.

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