Light Stops at Exceptional Points.

@article{Goldzak2017LightSA,
  title={Light Stops at Exceptional Points.},
  author={Tamar Goldzak and Alexei A. Mailybaev and Nimrod Moiseyev},
  journal={Physical review letters},
  year={2017},
  volume={120 1},
  pages={
          013901
        }
}
Almost twenty years ago, light was slowed down to less than 10^{-7} of its vacuum speed in a cloud of ultracold atoms of sodium. Upon a sudden turn-off of the coupling laser, a slow light pulse can be imprinted on cold atoms such that it can be read out and converted into a photon again. In this process, the light is stopped by absorbing it and storing its shape within the atomic ensemble. Alternatively, the light can be stopped at the band edge in photonic-crystal waveguides, where the group… 

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References

SHOWING 1-10 OF 60 REFERENCES

Light speed reduction to 17 metres per second in an ultracold atomic gas

Techniques that use quantum interference effects are being actively investigated to manipulate the optical properties of quantum systems. One such example is electromagnetically induced transparency,

Gain-assisted superluminal light propagation

Gain-assisted linear anomalous dispersion is used to demonstrate superluminal light propagation in atomic caesium gas and is observed to be a direct consequence of classical interference between its different frequency components in an anomalously dispersion region.

Coherent control of optical information with matter wave dynamics

It is demonstrated that a slow light pulse can be stopped and stored in one Bose–Einstein condensates and subsequently revived from a totally different condensate, 160 μm away; information is transferred through conversion of the optical pulse into a travelling matter wave.

Stationary pulses of light in an atomic medium

This work describes and experimentally demonstrate a technique in which light propagating in a medium of Rb atoms is converted into an excitation with localized, stationary electromagnetic energy, which can be held and released after a controllable interval, offering new possibilities for photon state manipulation and nonlinear optical processes at low light levels.

Electromagnetically induced transparency : Optics in coherent media

Coherent preparation by laser light of quantum states of atoms and molecules can lead to quantum interference in the amplitudes of optical transitions. In this way the optical properties of a medium

Stopping light all optically.

We show that light pulses can be stopped and stored coherently, with an all-optical adiabatic and reversible pulse bandwidth compression process. Such a process overcomes the fundamental

Stopping light in a waveguide with an all-optical analog of electromagnetically induced transparency.

A new all-optical mechanism that can compress the bandwidth of light pulses to absolute zero, and bring them to a complete stop, is introduced and demonstrated by finite-difference time-domain simulations of an implementation in photonic crystals.

Dynamic control of the Q factor in a photonic crystal nanocavity.

The first demonstration of dynamic control of the Q factor is presented, by constructing a system composed of a nanocavity, a waveguide with nonlinear optical response and a photonic-crystal hetero-interface mirror, which was successfully changed from approximately 3,000 to approximately 12,000 within picoseconds.

Dynamically encircling an exceptional point for asymmetric mode switching

It is demonstrated that a dynamical encircling of an exceptional point is analogous to the scattering through a two-mode waveguide with suitably designed boundaries and losses, and mode transitions are induced that transform this device into a robust and asymmetric switch between different waveguide modes.

Stopped light and image storage by electromagnetically induced transparency up to the regime of one minute.

By combination of the self-learning loop for optimized optical preparation and improved dynamical decoupling, this work extends EIT storage times in a doped solid above 40 s and demonstrates storage of images by EIT for 1 min, a new benchmark for EIT-based memories.
...