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Observation of negative pulse delay in a microsphere

Kouki Totsuka, Makoto Tomita

We observed −4.9 ns negative delay in optical pulse propagation associated with a single Mie scattering process. The observed fast light can well be explained by a directional coupling theory on the under coupling condition.

Conference on Lasers and Electro-OpticsJan 1, 20060 citations

Observation of fast and slow light in a microsphere-optical fiber system

Kouki Totsuka, Makoto Tomita

We observed both -8ns negative and 21ns positive delays in the optical pulse propagation through a microsphere-fiber system on the under and over coupling conditions, respectively, which are explained by a directional coupling theory.

Quantum Electronics and Laser Science ConferenceMay 1, 20070 citations

Direct observation of stopped light in a whispering-gallery-mode microresonator

Anatoliy A. Savchenkov, Andrey B. Matsko, Vladimir S. Ilchenko +2 more

We introduce the definition of group velocity for a system with a discrete spectrum and apply it to a linear resonator. We show that a positive, negative, or zero group velocity can be obtained for light propagating in the whispering-gallery modes of a microspherical resonator. The associated group delay is practically independent of the ring-down time of the resonator. We demonstrate ``stopped light'' in an experiment with a fused silica microsphere.

Physical Review AAug 17, 200744 citations

The maximum group delay in a resonator: an unconventional approach

Andrey B. Matsko, Anatoliy A. Savchenkov, Vladimir S. Ilchenko +2 more

We introduce a definition of group velocity for a system with a discreet spectrum and apply it to a linear resonator. We show that a positive, negative, or zero group velocity can be obtained for light propagating in the whispering gallery modes of a microspherical resonator. The associated group delay is practically independent of the ring-down time of the resonator. We demonstrate "stopped light" in an experiment with a fused silica microsphere.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEFeb 8, 20070 citations

Observation of slow light in coupled-resonator-induced transparency

Kouki Totsuka, Norihiko Kobayashi, Makoto Tomita

We observed slow light in a coupled-resonator induced transparency in a tandem microsphere-fiber-taper system. Nearly Gaussian-shaped pulses propagated with a large positive delay of 6.2 ns and 78% transmission through a transparent frequency window.

Conference on Lasers and Electro-OpticsMay 4, 20080 citations

Slow and fast light in a microsphere-optical fiber system

Kouki Totsuka, Makoto Tomita

The dispersion relation in a system of a fiber taper coupled with a microsphere is investigated. On the undercoupling condition, in which the coupling strength between the sphere and the fiber is weak compared with the round-trip loss in the sphere, the system shows anomalous dispersion. On the other hand, on the overcoupling condition, in which the coupling strength is strong compared with the loss, the system shows normal dispersion. We performed pulse propagation experiments and observed both the slow light and the fast light relevant to the normal and anomalous dispersions in the single microsphere-fiber taper system, controlling the coupling strength between the sphere and the fiber. The observed pulse propagation times show good agreement with theoretical calculations based on a directional coupling theory.The dispersion relation in a system of a fiber taper coupled with a microsphere is investigated. On the undercoupling condition, in which the coupling strength between the sphere and the fiber is weak compared with the round-trip loss in the sphere, the system shows anomalous dispersion. On the other hand, on the overcoupling condition, in which the coupling strength is strong compared with the loss, the system shows normal dispersion. We performed pulse propagation experiments and observed both the slow light and the fast light relevant to the normal and anomalous dispersions in the single microsphere-fiber taper system, controlling the coupling strength between the sphere and the fiber. The observed pulse propagation times show good agreement with theoretical calculations based on a directional coupling theory.

Journal of the Optical Society of America BSep 28, 200650 citations

Observation of Fast Light in a Microsphere

Abstract

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Observation of Fast Light in a Microsphere

Abstract

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