J
Johan Christensen
Researcher at Charles III University of Madrid
Publications - 99
Citations - 7153
Johan Christensen is an academic researcher from Charles III University of Madrid. The author has contributed to research in topics: Metamaterial & Topological insulator. The author has an hindex of 28, co-authored 83 publications receiving 5098 citations. Previous affiliations of Johan Christensen include University of Southern Denmark & Technical University of Denmark.
Papers
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Controlling sound with acoustic metamaterials
TL;DR: In this article, a review of the design and properties of active acoustic metamaterials can be found, as well as an overview of future directions in the field of sound manipulation.
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Flexible mechanical metamaterials
TL;DR: In this article, the design principles leading to these properties are identified and discussed, in particular, linear and mechanism-based metamaterials (such as origami-based and kirigami based metammaterials), harnessing instabilities and frustration, and topological and nonlinear metam materials.
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Graphene plasmon waveguiding and hybridization in individual and paired nanoribbons.
Johan Christensen,Alejandro Manjavacas,Sukosin Thongrattanasiri,Frank H. L. Koppens,F. Javier García de Abajo +4 more
TL;DR: A universal scaling law is introduced that considerably simplifies the analysis an understanding of plasmons in doped graphene and provides the building blocks to construct graphene plasmon circuits for future compact plAsmon devices with potential application to optical signal processing, infrared sensing, and quantum information technology.
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A holey-structured metamaterial for acoustic deep-subwavelength imaging
Jie Zhu,Johan Christensen,Jesper Jung,Luis Martín-Moreno,Xiaobo Yin,Lee Fok,Xiang Zhang,Francisco J. Garcia-Vidal +7 more
TL;DR: In this article, a three-dimensional periodic structure was proposed to focus acoustic waves to a spot size that is one fiftieth of the wavelength, which could lead to improved resolution for ultrasound imaging.
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Topological Sound
TL;DR: In this article, the authors review the latest efforts to explore with sound waves topological states of quantum matter in two-and three-dimensional systems where spin and valley degrees of freedom appear as highly novel ingredients to tailor the flow of sound in the form of one-way edge modes and defect-immune protected acoustic waves.