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- Mikhail Lapine, Maxim V. Gorkunov, K. H. Ringhofer
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2003

We consider a possibility to create a metamaterial with nonlinear magnetic response in the microwave frequency range. Such a metamaterial is a regular periodic three-dimensional-array of resonantâ€¦ (More)

The effective aperture of a receiving dipole is studied under matched and unmatched conditions. The results for the matched case correspond to expectations but lack of matching is shown to lead toâ€¦ (More)

- Barry Sturman, E. V. Podivilov, +5 authors A A Kamshilin
- Physical review. E, Statistical physics, plasmasâ€¦
- 1999

We present an analytical theory of vectorial wave coupling in photorefractive cubic crystals which are, in general, optically active. The theory is based on the systematic use of the spatial symmetryâ€¦ (More)

- Alexander Bledowski, Jeroen J. T. Otten, K. H. Ringhofer
- Optics letters
- 1991

The photorefractive recording process as described by Kukhtarev's material equations is investigated for large modulation depths. We find that for modulation 1 the density N(+)(D) of ionized traps atâ€¦ (More)

- V P Kamenov, Ekaterina Shamonina, K. H. Ringhofer, Ervin Nippolainen, Vladimir V. Prokofiev, A A Kamshilin
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2001

We investigate here both theoretically and experimentally light-induced scattering in (111)-cut Bi12TiO20 crystals with an external ac field. Our simple analytic solution, which is nearly as preciseâ€¦ (More)

- Barry Sturman, M. Mann, K. H. Ringhofer
- Optics letters
- 1993

It is shown that a resonance-enhanced moving grating in a photorefractive crystal is unstable against the growth of weakly damped space-charge waves. The threshold of the instability and the rate ofâ€¦ (More)

- Serguey Odoulov, Barry Sturman, Ekaterina Shamonina, K. H. Ringhofer
- Optics letters
- 1996

Our experiment shows that stimulated backscattering from photorefractive LiNbO(3):Fe crystals occurs not only for an orientation of the polar axis that is parallel to the input beam but also for theâ€¦ (More)

- Kathleen R. Buse, Sarah Kamper, Jaime Frejlich, Rainer Pankrath, K. H. Ringhofer
- Optics letters
- 1995

- Ekaterina Shamonina, K. H. Ringhofer, +8 authors Timo Jaaskelainen
- Optics letters
- 1998

We show theoretically and experimentally that switching an applied square-wave field produces strong and short pulses of the outgoing signal during two-wave mixing in sillenite crystals. These pulsesâ€¦ (More)

- Barry Sturman, M. Mann, K. H. Ringhofer
- Optics letters
- 1992

It is shown that spatial gratings in photorefractive crystals, induced by the standing interference pattern of two coherent waves and an external alternating electric field, may be unstable againstâ€¦ (More)