173 citations · 300 across the 6 of their papers we have counts for
6 papers
Electromagnetic Energy Sink
Constantinos A. Valagiannopoulos, Joni Vehmas, Constantin R. Simovski +2
The ideal black body fully absorbs all incident rays, that is, all propagating waves created by arbitrary sources. The known idealized realization of a black body is the perfectly…
Functional metamirrors
V. S. Asadchy, Y. Radi, J. Vehmas +1
Conventional mirrors obey Snell's reflection law: a plane wave is reflected as a plane wave, at the same angle. To engineer spatial distributions of fields reflected from a mirror,…
Omega Transmission Lines with Applications to Effective Medium Models of Metamaterials
Joni Vehmas, Silvio Hrabar, Sergei Tretyakov
In this paper we introduce the concept of transmission lines with inherent bi-anisotropy and establish an analogy between these lines and volumetric bi-anisotropic materials. In pa…
Eliminating Electromagnetic Scattering from Small Particles
Joni Vehmas, Younes Ra'di, Antti Karilainen +1
This paper presents and discusses the conditions for zero electromagnetic scattering by electrically small particles. We consider the most general bi-anisotropic particles, charact…
A microwave transmission-line network guiding electromagnetic fields through a dense array of metallic objects
Pekka Alitalo, Sylvain Ranvier, Joni Vehmas +1
We present measurements of a transmission-line network, designed for cloaking applications in the microwave region. The network is used for channelling microwave energy through an…
Impedance-matched microwave lens
Pekka Alitalo, Olli Luukkonen, Joni Vehmas +1
A microwave lens with highly reduced reflectance, as compared to conventional dielectric lenses, is proposed. The lens is based on two-dimensional or three-dimensional transmission…