Mirage and superbending effect in two-dimensional graded photonic crystals

Centeno, Emmanuel; Cassagne, D.; Albert, J. P.

doi:10.1103/physrevb.73.235119

Cited by 110 publications

(60 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For particular chirp profiles, the wave can be substantially enhanced around the turning plane, whose position inside the crystal depends on the wave frequency. Chirped structures have been also used in optics 21,22 and acoustics [23][24][25] for different purposes such as rainbow trapping, [26][27][28] mirage formation, 29 the opening of wide full band gaps, 23 or also to control the spatial dispersion and focalizing beams in reflection. 22 From a practical point of view, it is desirable to obtain the highest enhancement or wave concentration (highest intensity in a shorter distance).…”

mentioning

confidence: 99%

Ultrasonic monitoring of lard crystallization during storage

Santacatalina

García-Pérez

Benedito

2011

Food Research International

View full text Add to dashboard Cite

The relevance of the people you love most is trully revealed when they are apart. Life goes on, memories remain.To my brother, Toño. La relevancia de las personas que más quieres se manifiesta realmente cuando no están. La vida sigue, los recuerdos permanecen.A mi hermano, Toño. AknowledgementsIt has been a long time since, after being involved for the first time in research during the realization of my Master Thesis, Víctor Sánchez gave me the oportunity to work with him to investigate subharmonic generation in resonant cavities. Soon after, he proposed me to start my PhD in the context of wave propagation in sonic crystals. I remember quite well my doubts and lack of confidence to start a PhD on this topic at that time. However, it was easy for Víctor to convince me, as science is a truly passion for him and he transmits it to everyone in his sorroundings. I am really grateful to him for sharing this years working together and totally convinced that I made the right choice. I also appreciate my other PhD supervisor, Rubén Picó, for his outstanding contribution and attitude, always open to discussion and helpful.Fortunately, by the time I started my PhD studies, our research group experimented a quick growth and several researchers gradually started to work with us, enriching my work deeply. Vicent Romero worked in Gandía for two years, and still collaborate with us. He made a huge contribution to our research group and to this thesis. He helped me in many ways and situations, including numerical simulations, experimental techniques, and any doubt I might have. I also want to acknowledge Lluis García Raffi, who collaborated a lot with me too. He is always ready to share his knowledge in mathematics and physics with me and able to generate a huge amount of ideas and proposals. I also appreciate the contributions from other members of the group, such as Javier Redondo, and the people from ICREA in Terrasa. I appreciate the contributions from Kestutis Staliunas, whose astonishing knowledge of physics is always an inspiration to us, and Yu-Chieh Cheng, our collaborations working in periodic structures in optics and acoustics were of great interest for me and her extreme efficiency in every task she performs is amazing.Chapter 5 of this thesis, and other works that are not included here, were developed in the University of Colorado at Boulder, in the USA, were I spent almost one year. I would like to acknowledge Mahmoud Hussein, from Dpt. of Aerospace Engineering Sciences, for giving me the oportunity to integrate myself in his group to work in the development of numerical techniques for elastic band structure calculation, and also for pushing hard to start and mantain a collaboration with our group in Gandía. It was an amazing experience were all the members of the group made me feel at home. Osama R. Bilal, Michael Frazier, Romik Khajehtourian, Dimitri Krattiger, Clémence Basquet and Hossein Honarvar, thank you all.Además de las personas con las que he trabajado en tareas directamente relacionadas con mi tesis, mi...

show abstract

mentioning

confidence: 99%

Ultrasonic monitoring of lard crystallization during storage

Santacatalina

García-Pérez

Benedito

2011

Food Research International

View full text Add to dashboard Cite

show abstract

“…These artificial materials are emerging as promising tools for potential applications in several branches of research and technology. 7 Several applications for focusing, 8,9 trapping, [10][11][12] bending waves, 13 opening of wide full band gaps 14 and controlling the spatial dispersion beams in reflection 15 have been developed. Recently, some of us presented a system with acoustic wave enhancement due to the progressive decrease of the group velocity along the propagation direction.…”

Section: Introductionmentioning

confidence: 99%

Broadband quasi perfect absorption using chirped multi-layer porous materials

et al. 2016

View full text Add to dashboard Cite

This work theoretically analyzes the sound absorption properties of a chirped multilayer porous material including transmission, in particular showing the broadband unidirectional absorption properties of the system. Using the combination of the impedance matching condition and the balance between the leakage and the intrinsic losses, the system is designed to have broadband unidirectional and quasi perfect absorption. The transfer and scattering matrix formalism, together with numerical simulations based on the finite element method are used to demonstrate the results showing excellent agreement between them. The proposed system allows to construct broadband sound absorbers with improved absorption in the low frequency regime using less amount of material than the complete bulk porous layer.

show abstract

“…A novel kind of heterogeneous media called as graded-index (GRIN) PCs has been introduced recently to enhance possibilities for controlling the flow of light [11,12]. GRIN PCs are a valuable choice when designing GRIN-media.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis of two different graded-index photonic-crystal lenses

Gharaati¹,

Miri²

2017

Ukr. J. Phys. Opt.

View full text Add to dashboard Cite

Abstract:We investigate two alternative approaches for implementing graded-index (GRIN) photonic-crystal (PC) structures that reveal a focusing effect. Gradient of the refractive index is achieved either using a symmetry-reduction approach (a structure of type I) or varying a filling fraction of PC elements (a structure of type II). We test the first structure for the frequencies located inside the first and second bands of the dispersion diagram. The focusing effect of the first structure characteristic for the frequencies located above the bandgap is stronger than that for the frequencies below the bandgap. It is demonstrated that variations of filling fractions of the elliptical air holes in the structure of type II produce a GRIN lens that manifests a pronounced focusing effect. We have also compared the focusing effects of the latter structure for the TE and TM polarizations. The both structures suggested in the present work can work in a broad enough band region.

show abstract

Mirage and superbending effect in two-dimensional graded photonic crystals

Cited by 110 publications

References 27 publications

Ultrasonic monitoring of lard crystallization during storage

Ultrasonic monitoring of lard crystallization during storage

Broadband quasi perfect absorption using chirped multi-layer porous materials

Comprehensive analysis of two different graded-index photonic-crystal lenses

Contact Info

Product

Resources

About