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Fachgebiet Theoretische Elektrotechnik (TET)
Prof. Dr. Jens Förstner

Willkommen im Fachgebiet Theoretische Elektrotechnik (TET)

Unser Forschungsgebiet ist die theoretische Beschreibung von photonischen und optoelektronischen Systemen wie optischen Nanoantennen, dielektrischen Wellenleitern, photonischen Kristallen, Metamaterialien, plasmonischen Systemen, oder biologischen/biomimetischen photonischen Strukturen. Unsere Stärke liegt in der Kombination von hochentwickelten Materialmodellen mit modernsten numerischen Methoden zur Simulation elektromagnetischer Felder.

Forschung: ThemenPublikationenTeam

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The five most recent publications


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Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter

L. Ebers, M. Hammer, M.B. Berkemeier, A. Menzel, J. Förstner, OSA Continuum (2019)

We investigate optical microresonators consisting of either one or two coupled rectangular strips between upper and lower slab waveguides. The cavities are evanescently excited under oblique angles by thin-film guided, in-plane unguided waves supported by one of the slab waveguides. Beyond a specific incidence angle, losses are fully suppressed. The interaction between the guided mode of the cavity-strip and the incoming slab modes leads to resonant behavior for specific incidence angles and gaps. For a single cavity, at resonance, the input power is equally split among each of the four output ports, while for two cavities an add-drop filter can be realized that, at resonance, routes the incoming power completely to the forward drop waveguide via the cavity. For both applications, the strength of the interaction is controlled by the gaps between cavities and waveguides.


Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating

M. Hammer, L. Ebers, J. Förstner, Journal of the Optical Society of America B (2019)


Method of superposing a multiple driven magnetic field to minimize stray fields around the receiver for inductive wireless power transmission

S. Lange, M. Büker, C. Hedayat, T. Otto, D. Sievers, J. Förstner, U. Hilleringmann, in: 13th International Conference & Exhibition on Integration Issues of Miniaturized Systems Barcelona, Spain, 10 – 11 April 2019, VDE VERLAG GMBH, 2019

This paper presents a new methodology by using a multiple coil array for energy transmission. The complex current strengths of the transmitting coil array are calculated by having the knowledge about of the mutual inductances and the symmetries of the transmitting coil array, so that its resulting magnetic field mainly penetrates only the receiving coil and is strongly attenuated outside. This method is used for an optimized wireless energy transmission but can also be implemented for other inductive applications.


Oblique evanescent excitation of a dielectric strip: A model resonator with an open optical cavity of unlimited Q

M. Hammer, L. Ebers, J. Förstner, Optics Express (2019), 27(7), pp. 8

A rectangular dielectric strip at some distance above an optical slab waveguide is being considered, for evanescent excitation of the strip through the semi-guided waves supported by the slab, at specific oblique angles. The 2.5-D configuration shows resonant transmission properties with respect to variations of the angle of incidence, or of the excitation frequency, respectively. The strength of the interaction can be controlled by the gap between strip and slab. For increasing distance, our simulations predict resonant states with unit extremal reflectance of an angular or spectral width that tends to zero, i.e. resonances with a Q-factor that tends to infinity, while the resonance position approaches the level of the guided mode of the strip. This exceptionally simple system realizes what might be termed a “bound state coupled to the continuum”.


Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation

D. Stankevich, L. Hradyska, Y. Shkuratov, Y. Grynko, G. Videen, J. Förstner, Journal of Quantitative Spectroscopy and Radiative Transfer (2019)

We consider light scattering from a new type of model particle whose shape is represented in the form of a generalized ellipsoid having N foci, where N is greater than two. Such particles can be convex as well as concave. We use the geometrical optics approximation to study the light scattering from 3-foci particles. Non-zero elements of the scattering matrix are calculated for ensembles of randomly oriented independent transparent particles, m = n + i0. Several internal reflection orders are considered separately. It was found that the transmission-transmission (TT) and transmission-reflectance-transmission (TRT) components dominate in the formation of intensity of scattered light at large and small phase angles, respectively. We found a significant role of the total internal reflections of the TRT in the middle portion of the phase angle range. The main factors in the formation of positive linear polarization are the R and TRT component. The TT component is responsible for the formation of negative polarization branch at large phase angles.


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Gruppenleitung

Prof. Dr. Jens Förstner

Theoretische Elektrotechnik (TET)

Jens Förstner
Telefon:
+49 5251 60-3013
Fax:
+49 5251 60-3524
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P1.5.01.1
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