aqora

Four-Wave Mixing in Metamaterials

Rena J. Kasumova, Г. А. Сафарова, Sh. Sh. Amirov +1 more

Russian Physics JournalDec 26, 20187 citations

Metamaterials with Gain and Interpretation of Transmission in Pump-Probe Experiments

Costas M. Soukoulis, Thomas Koschny

We numerically investigate loss compensation and transmission in pump-probe experiments in resonant metamaterials with gain using an FDTD algorithm coupled to semiclassical rate equations. We observe differential transmittance signals from the coupled system that are a factor of four to five larger than for the bare quantum well. We observe a more rapid temporal decay of the differential transmittance signal for the coupled system compared to the bare quantum well. The effective metamaterial gain beyond the bare quantum-well gain, leading to a significant reduction of the metamaterial’s losses, but no complete compensation of the losses. We explain experimentally observed negative differential transmission by gain-dependent impedance. Article not available.We numerically investigate loss compensation and transmission in pump-probe experiments in resonant metamaterials with gain using an FDTD algorithm coupled to semiclassical rate equations. We observe differential transmittance signals from the coupled system that are a factor of four to five larger than for the bare quantum well. We observe a more rapid temporal decay of the differential transmittance signal for the coupled system compared to the bare quantum well. The effective metamaterial gain beyond the bare quantum-well gain, leading to a significant reduction of the metamaterial’s losses, but no complete compensation of the losses. We explain experimentally observed negative differential transmission by gain-dependent impedance. Article not available.

Frontiers in OpticsJan 1, 20110 citations

Frequency Shift in Tunable Electromagnetically Induced Transparency-like Metamaterials

Mingming Chen, Xue‐Xia Yang

PlasmonicsOct 13, 20235 citations

Theory of Pump-Probe Experiments of Metallic Metamaterials Coupled to a Gain Medium

Zhixiang Huang, Thomas Koschny, C. M. Soukoulis

We establish a new approach for pump-probe simulations of metallic metamaterials coupled to the gain materials. It is of vital importance to understand the mechanism of the coupling of metamaterials with the gain medium. Using a four-level gain system, we have studied light amplification of arrays of metallic split-ring resonators with a gain layer underneath. We find that the differential transmittance ΔT/T can be negative for split-ring resonators on the top of the gain substrate, which is not expected, and ΔT/T is positive for the gain substrate alone. These simulations agree with pump-probe experiments and can help to design new experiments to compensate for the losses of metamaterials.We establish a new approach for pump-probe simulations of metallic metamaterials coupled to the gain materials. It is of vital importance to understand the mechanism of the coupling of metamaterials with the gain medium. Using a four-level gain system, we have studied light amplification of arrays of metallic split-ring resonators with a gain layer underneath. We find that the differential transmittance ΔT/T can be negative for split-ring resonators on the top of the gain substrate, which is not expected, and ΔT/T is positive for the gain substrate alone. These simulations agree with pump-probe experiments and can help to design new experiments to compensate for the losses of metamaterials.

arXiv:1203.6298Physical Review LettersMay 4, 201254 citations

Enhancement of Single-Photon Sources with Metamaterials

Mikhail Y. Shalaginov, Simeon Bogdanov, Vadim Vorobyov +5 more

WORLD SCIENTIFIC eBooksJun 28, 20152 citations

Light amplification in silicon nanocrystals by pump and probe transmission measurements

Luca Dal Negro, M. Cazzanelli, Beniamino Danese +4 more

Net optical gain in silicon nanocrystals (Si-nc) has been measured by pump and probe transmission experiments. Si-nc active layers have been produced by plasma enhanced chemical vapor deposition on transparent quartz substrates. Continuous and pulsed pump and probe transmission measurements have shown clear evidences of net probe amplification with fast (nanosecond) response time. Transfer matrix and rate equations modeling of the nonlinear signal transmission allowed to extract the gain spectra for different pump intensities yielding good qualitative agreement with the experimental data. Gain cross sections per nanocrystals of the order of 3×10−16cm2 have been deduced. The physical origin of the optical amplification is interpreted within a four level recombination model describing the dynamics of strongly localized excitons at the Si-nc∕SiO2 interface.Net optical gain in silicon nanocrystals (Si-nc) has been measured by pump and probe transmission experiments. Si-nc active layers have been produced by plasma enhanced chemical vapor deposition on transparent quartz substrates. Continuous and pulsed pump and probe transmission measurements have shown clear evidences of net probe amplification with fast (nanosecond) response time. Transfer matrix and rate equations modeling of the nonlinear signal transmission allowed to extract the gain spectra for different pump intensities yielding good qualitative agreement with the experimental data. Gain cross sections per nanocrystals of the order of 3×10−16cm2 have been deduced. The physical origin of the optical amplification is interpreted within a four level recombination model describing the dynamics of strongly localized excitons at the Si-nc∕SiO2 interface.

Journal of Applied PhysicsNov 5, 200454 citations

Metamaterials with gain and interpretation of transmission in pump-probe experiments

Related papers

Metamaterials with gain and interpretation of transmission in pump-probe experiments

Related papers