S
Steffen Kjær Johansen
Researcher at Technical University of Denmark
Publications - 12
Citations - 225
Steffen Kjær Johansen is an academic researcher from Technical University of Denmark. The author has contributed to research in topics: Soliton & Grating. The author has an hindex of 6, co-authored 12 publications receiving 212 citations. Previous affiliations of Steffen Kjær Johansen include Polytechnic University of Catalonia & University of Nice Sophia Antipolis.
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Journal ArticleDOI
Dyakonov Surface Waves: A Review
Osamu Takayama,Lucian Cornel Crasovan,Steffen Kjær Johansen,Dumitru Mihalache,David Artigas,Lluis Torner +5 more
TL;DR: In this article, the existence of surface waves in specific material examples is analyzed, discussing the challenge posed by their experimental observation, and the most important advances in this topic are briefly discussed in this review, pointing out aspects that have not been clearly covered by the literature.
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Engineering of spatial solitons in two-period QPM structures
TL;DR: In this paper, a scheme was proposed to engineer the effective competing nonlinearities that on average govern the light propagation in quasi-phase-matching (QPM) gratings.
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Enhanced localization of Dyakonov-like surface waves in left-handed materials
Lucian-Cornel Crasovan,Osamu Takayama,David Artigas,Steffen Kjær Johansen,Dumitru Mihalache,Lluis Torner +5 more
TL;DR: In this article, the existence and properties of hybrid surface waves forming at interfaces between left-handed materials and dielectric birefringent media were investigated. And the existence conditions of such waves were found to be highly relaxed in comparison to Dyakonov waves existing in right-handed media.
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Characterization of quasi-phase-matching gratings in quadratic media through double-pass second-harmonic power measurements
TL;DR: In this paper, a quasi-phase-matching grating structure and temperature gradients through inverse Fourier theory using second-harmonic-generation experiments is proposed, where a mirror is inserted to reflect the signals back through the sample, and it is possible to retrieve the relevant information by measuring only the generated secondharmonic power.
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Escape angles in bulk chi((2)) soliton interactions.
TL;DR: In this article, the authors developed a theory for nonplanar interaction between two identical type I spatial solitons propagating at opposite but arbitrary transverse angles in quadratic nonlinear (or so-called Χ ( 2 ) ) bulk media.