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Slow Light in Coupled-Resonator-Induced Transparency

Kouki Totsuka, Norihiko Kobayashi, Makoto Tomita

We performed optical pulse propagation experiments in a system in which two ultrahigh-Q silica microspheres of different diameters were coupled in tandem to a fiber taper to yield coupled-resonator-induced transparency. Nearly Gaussian-shaped optical pulses propagated with a large positive delay of 8.5 ns through a transparent frequency window, without significant attenuation, amplification, or pulse deformation, demonstrating classical analogy of the extremely slow light obtained with electromagnetically induced transparency.We performed optical pulse propagation experiments in a system in which two ultrahigh-Q silica microspheres of different diameters were coupled in tandem to a fiber taper to yield coupled-resonator-induced transparency. Nearly Gaussian-shaped optical pulses propagated with a large positive delay of 8.5 ns through a transparent frequency window, without significant attenuation, amplification, or pulse deformation, demonstrating classical analogy of the extremely slow light obtained with electromagnetically induced transparency.

Physical Review LettersMay 25, 2007476 citations

Inverted coupled-resonator-induced transparency

Tohru Oishi, Makoto Tomita

The inverted spectral structure of coupled-resonator-induced transparency was experimentally demonstrated using an amplifying optical ring resonator, to which another dark ring resonator was coupled. A nonamplifying spectral window was induced by the dark resonator in an otherwise strongly amplifying spectral region. Within the induced window, sharp anomalous dispersion was expected. Propagation of nearly Gaussian-shaped optical pulses was observed; the pulses propagated through the amplifying medium with a negative delay of $\ensuremath{-}$20.8 ns, without significant amplification, attenuation, or pulse deformation. The inverted induced-transparency system, producing tunable fast light, is a complementary system to traditional induced-transparency systems that produce slow light and could be potentially useful in numerous applications.The inverted spectral structure of coupled-resonator-induced transparency was experimentally demonstrated using an amplifying optical ring resonator, to which another dark ring resonator was coupled. A nonamplifying spectral window was induced by the dark resonator in an otherwise strongly amplifying spectral region. Within the induced window, sharp anomalous dispersion was expected. Propagation of nearly Gaussian-shaped optical pulses was observed; the pulses propagated through the amplifying medium with a negative delay of $\ensuremath{-}$20.8 ns, without significant amplification, attenuation, or pulse deformation. The inverted induced-transparency system, producing tunable fast light, is a complementary system to traditional induced-transparency systems that produce slow light and could be potentially useful in numerous applications.

Physical Review AJul 9, 201319 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

Observation of group delay in optical fiber resonator

Nan Wang, Yundong Zhang, Xuenan Zhang +4 more

We observed the Coupled-resonator-induced transparency phenomenon in coupled fiber resonators. At the center of the induced transparency window, where 68% of the input pulse is transmitted, we got 20.3 ns group delay in coupled fiber resonators.

Aug 1, 20090 citations

Observation of Fast Light in a Microsphere

Kouki Totsuka, Makoto Tomita

We observed -4.9 ns negative delay in optical pulse propagation in resonant Whispering Gallery Mode of microsphere. The observed fast light can well be explained by a directional coupling theory on the under coupling condition.

Photonic Metamaterials: From Random to PeriodicJan 1, 20060 citations

Advanced and delayed optical images through single and coupled image resonators

Parvin Sultana, Takahiro Matsumoto, Makoto Tomita

We propagated transverse two-dimensional images encoded on optical pulses through a frequency window of coupled-image-resonator-induced transparency. The optical images are stored and delayed by 10.6 ns.

Conference on Lasers and Electro-OpticsJan 1, 20110 citations

Observation of slow light in coupled-resonator-induced transparency

Abstract

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Observation of slow light in coupled-resonator-induced transparency

Abstract

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