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Experimental evidence of robust acoustic valley Hall edge states in a non-resonant topological elastic waveguide [article]

Ting-Wei Liu, Fabio Semperlotti
2018 arXiv   pre-print
to the weak coupling between oppositely valley-polarized modes.  ...  Finally, we show that the weak coupling between the valleys can be exploited to achieve selective mode injection at the domain wall, hence realizing a very effective excitation strategy of the chiral edge  ...  ACKNOWLEDGMENTS The authors gratefully acknowledge the financial support of the Air Force Office of Scientific Research under Grant No. YIP FA9550-15-1-0133. The authors also thank Mr.  ... 
arXiv:1803.04910v2 fatcat:ixirleyfovek5az4vlbojuougi

Hermitian and Non-Hermitian Mode Coupling in a Microdisk Resonator Due to Stochastic Surface Roughness Scattering

Stefano Biasi, Fernando Ramiro-Manzano, Fabio Turri, Pierre-Elie Larre, Mher Ghulinyan, Iacopo Carusotto, Lorenzo Pavesi
2019 IEEE Photonics Journal  
Pavesi was in charge of the general supervision of the work and contributed to the text.  ...  Ramiro-Manzano conceived and have made a substantial and equal contribution to all the stages of the study, including writing the paper. F. Turri has participated in the experiment.  ...  We use a novel phase-sensitive set-up to measure both the intensity and the phase-shift of light propagating along a waveguide coupled to the resonator.  ... 
doi:10.1109/jphot.2018.2880281 fatcat:wpcwuk7m6fee3kesohbuwalrhi

Modeling the impact of manufacturing imperfections on photonic crystal device performance: design of perturbation-tolerant PBG components

Maksim Skorobogatiy, Steven A. Jacobs, Steven G. Johnson, Michel Meunier, Yoel Fink, Richard M. De La Rue, Pierre Viktorovitch, Clivia M. Sotomayor Torres, Michele Midrio
2004 Photonic Crystal Materials and Nanostructures  
Standard perturbation theory (PT) and coupled mode theory (CMT) formulations fail or exhibit very slow convergence when applied to the analysis of geometrical variations in high index-contrast optical  ...  We have also successfully extended this methodology to treat radiation scattering due to common geometric variations in generic photonic crystals.  ...  CONCLUSION In this work, we presented a novel form of the coupled mode and perturbation theories to treat geometric variations of generic waveguide profiles with an arbitrary dielectric index contrast.  ... 
doi:10.1117/12.545249 fatcat:zdbg3mcodre5bpf6mmlojv36ei

Topological hyperbolic lattices [article]

Sunkyu Yu, Xianji Piao, Namkyoo Park
2020 arXiv   pre-print
Our approach is applicable to general non-Euclidean geometry and enables the exploitation of infinite lattice degrees of freedom for band theory.  ...  Notably, an infinite number of regular tessellations in hyperbolic geometry-hyperbolic lattices-can extend Euclidean Bravais lattices and the consequent band theory to non-Euclidean geometry.  ...  A schematic for the coupled mode theory that describes the indirect coupling between optical resonators through the waveguide loop. Fig. S3 .  ... 
arXiv:2003.07002v1 fatcat:7bzkmssjbnexnpagsjdo6szg5m

Selective mode conversion and rainbow trapping via graded elastic waveguides [article]

Jacopo M. De Ponti, Luca Iorio, Emanuele Riva, Raffaele Ardito, Francesco Braghin, Alberto Corigliano
2021 arXiv   pre-print
We experimentally achieve wave mode conversion and rainbow trapping in an elastic waveguide loaded with an array of resonators.  ...  By breaking the geometrical symmetry of the waveguide, we combine the wave speed reduction with a reflection mechanism that mode-converts flexural waves impinging on the array into torsional waves travelling  ...  We also gratefully acknowledge the Italian Ministry of Education, University and Research for the support provided through the Project "Department of Excellence LIS4.0-Lightweight and Smart Structures  ... 
arXiv:2104.14394v1 fatcat:7ujm6pod5rdg3cp3yd5gzymcre

Waveguide effective plasmonics with structure dispersion

Xu Qin, Wangyu Sun, Ziheng Zhou, Pengyu Fu, Hao Li, Yue Li
2021 Nanophotonics  
This review provides the underlying physics of the waveguide effective plasmonics and its applications varying from classical plasmonic concepts to novel effective plasmonic devices.  ...  In this review, we focus on the technique of waveguide effective plasmonics, which is a feasible low-loss realization of plasmonic metamaterials in lower frequency based on the structural dispersion.  ...  of TE 10 mode in the rectangle waveguide.  ... 
doi:10.1515/nanoph-2021-0613 fatcat:bz4tjgib4zhvhktc2sl2cpvh3e

Controlling phonons and photons at the wavelength scale: integrated photonics meets integrated phononics

Amir H. Safavi-Naeini, Dries Van Thourhout, Roel Baets, Raphaël Van Laer
2019 Optica  
In these devices, such as optomechanical waveguides and resonators, optical photons and gigahertz phonons are ideally matched to one another as both have wavelengths on the order of micrometers.  ...  We also summarize the state of the art in nanoscale electro- and optomechanical systems with a focus on scalable platforms such as silicon.  ...  Optomechanical interactions give rise to coupling between these modes in the following way: the deformation of the structure in a specific vibrational mode parametrized by x, causes a change in the optical  ... 
doi:10.1364/optica.6.000213 fatcat:rq5bvawaybhphpz5hzl5tgjpoy

On the nature of critical points in leakage regimes of a conductor-backed coplanar strip line

A.B. Yakovlev, G.W. Hanson
1997 IEEE transactions on microwave theory and techniques  
The locations and types of critical points determine the stability and instability of the transmission line system with respect to small changes in geometrical parameters.  ...  The proposed analysis enables the prediction of bifurcation situations and the existence of improper real and complex solutions and gives a complete description of the system's structural behavior.  ...  ACKNOWLEDGMENT The authors would like to acknowledge thoughtful comments and suggestions made by a reviewer.  ... 
doi:10.1109/22.552036 fatcat:fcwlqih5gbearhc72xrmuoo2ba

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

Han Ye, Yanrong Wang, Shuhe Zhang, Danshi Wang, Yumin Liu, Mingchao Wang, Qiming Zhang
2021 Nanoscale Advances  
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...  ...  Acknowledgements The financial support of this work is from the National Natural Science Foundation of  ...  [13] , metasurface [14] , deformed silicon waveguide [15] , partially etching [16] [17] [18] , direct waveguide coupling [5, 19] and sub-wavelength grating coupling [20, 21] .  ... 
doi:10.1039/d1na00198a fatcat:nilfrctqejgm5bztuqqmu2kd6e

Modeling light-sound interaction in nanoscale cavities and waveguides

Yan Pennec, Vincent Laude, Nikos Papanikolaou, Bahram Djafari-Rouhani, Mourad Oudich, Said El Jallal, Jean Charles Beugnot, Jose M. Escalante, Alejandro Martínez
2014 Nanophotonics  
A common feature of all these phenomena is the feasibility to tightly confine photons and phonons of similar wavelengths in a very small volume.  ...  The main reason is that this interaction is responsible for a wide variety of intriguing physical phenomena, ranging from the laser-induced cooling of a micromechanical resonator down to its ground state  ...  An analysis of the symmetry can be done to discriminate the phonon-photon mode pairs that provide a vanishing AO coupling.  ... 
doi:10.1515/nanoph-2014-0004 fatcat:k2vd2oqhajbw3f3amo3kupqan4

Axially open nonradiative structures: An example of single-mode resonator based on the sample holder

G. Annino, M. Cassettari, M. Martinelli
2005 Review of Scientific Instruments  
An approximate chart of the allowed dielectric and geometrical parameters for the TE011 mode is given.  ...  The predictions of the theoretical analysis are well confirmed, both in the general behaviour and in the expected quality factors.  ...  Acknowledgments The help of C. A. Massa in the preparation of the experimental setup is gratefully acknowledged.  ... 
doi:10.1063/1.1986989 fatcat:4wh6m4hf45gh3i3tr5esa7q5re

Non-Hermitian Physics and Engineering in Silicon Photonics [chapter]

Changqing Wang, Zhoutian Fu, Lan Yang
2021 Topics in applied physics  
laser engineering, control of light propagation, topological mode conversion, etc.  ...  refractive index, modal coupling and gain-loss distribution.  ...  Each of the channel waveguide supports a fundamental guided mode, and the slab-waveguide patch is coupled to second channel waveguide to control the radiation loss.  ... 
doi:10.1007/978-3-030-68222-4_7 fatcat:ctf2rlhkxzdjfbyjcs2hizdvsq

Predicting the broadband response of a layered cone-cylinder-cone shell

Dimitrios Chronopoulos, Mohamed Ichchou, Bernard Troclet, Olivier Bareille
2014 Composite structures  
In the low and the mid-frequency ranges a WFEM derived ESL approach implemented within a FEM is used in order to predict the response of the shell.  ...  These CLF are implemented within a SEA approach in order to predict the structural response.  ...  Acknowledgements The authors would like to gratefully acknowledge the ITN Marie Curie project GA-214909 'MID-FREQUENCY: CAE Methodologies for Mid-Frequency Analysis in Vibration and Acoustics' for the  ... 
doi:10.1016/j.compstruct.2013.07.055 fatcat:b7qc6sg4dzewhffpyrgsoijffy

Topological photonics

Ling Lu, John D. Joannopoulos, Marin Soljačić
2014 Nature Photonics  
These novel waveguides allow light to flow around large imperfections without back-reflection.  ...  Topology is revolutionizing photonics, bringing with it new theoretical discoveries and a wealth of potential applications.  ...  As shown in Fig. 4b , a 2D array of whispering-gallery resonators are spatially coupled through waveguides in between.  ... 
doi:10.1038/nphoton.2014.248 fatcat:qmfbgwh2uvbalom2ky7vcio7ba

Chemical Sensors Based on Photonic Structures [chapter]

Vittorio M. N. Passaro, Benedetto Troia, Mario La, Francesco De
2012 Advances in Chemical Sensors  
Fig. 21 . 21 (a) Top view of the spiral-path folded resonant cavity coupled to a bus waveguide.  ...  In Fig. 6 , it is possible to appreciate the optical field distribution in a silicon slot waveguide and a relative geometrical definition of the slab slot architecture.  ...  A typical chemical sensor is a device that transforms chemical information in a selective and reversible way, ranging from the concentration of a specific sample component to total composition analysis  ... 
doi:10.5772/30719 fatcat:3syogvf4ubaidn5q6ymptjdawe
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