The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Makoto Tomita - One of the best experts on this subject based on the ideXlab platform.
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Advanced and delayed optical images through single and coupled image resonators
CLEO: 2011 - Laser Science to Photonic Applications, 2011Co-Authors: Parvin Sultana, Takahiro Matsumoto, Makoto TomitaAbstract: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.
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Observation of slow light in coupled-resonator-induced transparency
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Kouki Totsuka, Norihiko Kobayashi, Makoto TomitaAbstract: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.
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slow light in coupled resonator induced transparency
Physical Review Letters, 2007Co-Authors: Kouki Totsuka, Norihiko Kobayashi, Makoto TomitaAbstract: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.
Ranjit Biswas - One of the best experts on this subject based on the ideXlab platform.
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dielectric relaxations of acetamide electrolyte deep eutectic solvents in the Frequency Window 0 2 ν ghz 50 anion and cation dependence
Journal of Physical Chemistry B, 2015Co-Authors: Kallol Mukherjee, Samiran Choudhury, Anjan Barman, Ranjit BiswasAbstract:Dielectric relaxation (DR) measurements in the Frequency range 0.2 ≤ ν/GHz ≤ 50 have been carried out for neat molten acetamide and six different (acetamide + electrolyte) deep eutectic solvents (DESs) for investigating ion effects on DR dynamics in these ionic DESs. Electrolytes used are lithium salts of bromide (LiBr), nitrate (LiNO3), and perchlorate (LiClO4); sodium salts of perchlorate (NaClO4) and thiocyante (NaSCN); and potassium thiocyanate (KSCN). With these electrolytes acetamide forms DESs approximately at an 80:20 mol ratio. Simultaneous fits to the measured permittivity (e′) and loss (e″) spectra of these DESs at ∼293 K require a sum of four Debye (4-D) processes with relaxation times spread over picosecond to nanosecond regime. In contrast, DR spectra for neat molten acetamide (∼354 K) depict 2-D relaxation with time constants ∼50 ps and ∼5 ps. For both the neat and ionic systems, the undetected dispersion, e∞ – nD2, remains to be ∼3–4. Upon comparison, measured DR dynamics reveal pronounced...
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stokes shift dynamics of ionic liquids solute probe dependence and effects of self motion dielectric relaxation Frequency Window and collective intermolecular solvent modes
Journal of Chemical Physics, 2013Co-Authors: Snehasis Daschakraborty, Ranjit BiswasAbstract:In this paper we have used a semi-molecular theory for investigating the probe dependence of Stokes shift dynamics in room temperature ionic liquids (ILs) by considering three different but well-known dipolar solvation probes—coumarin 153, trans-4-dimethylamino-4′-cyanostilbene, and 4-aminophthalimide. In addition, effects on polar solvation energy relaxation in ILs of solute motion, Frequency coverage (Frequency Window) accessed by dielectric relaxation measurements and collective IL intermolecular modes (CIMs) at tera-hertz range have been explored. Eleven different ILs have been considered for the above theoretical study. Calculated results show better agreement with the recent (fluorescence up-conversion (FLUPS) + time-correlated single photon counting (TCSPC)) experimental results, particularly at short times, when the CIM contribution to the Frequency dependent dielectric function (ɛ(ω)) is included. This is done via assigning the missing dispersion in an experimental ɛ(ω) to an IL intermolecular mo...
Kouki Totsuka - One of the best experts on this subject based on the ideXlab platform.
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Observation of slow light in coupled-resonator-induced transparency
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Kouki Totsuka, Norihiko Kobayashi, Makoto TomitaAbstract: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.
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slow light in coupled resonator induced transparency
Physical Review Letters, 2007Co-Authors: Kouki Totsuka, Norihiko Kobayashi, Makoto TomitaAbstract: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.
Martin Koch - One of the best experts on this subject based on the ideXlab platform.
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Ultra-broadband THz time-domain spectroscopy of common polymers with THz air-photonics
2014 Conference on Lasers and Electro-Optics (CLEO) - Laser Science to Photonic Applications, 2014Co-Authors: Francesco D'angelo, Martin Koch, Mischa Bonn, Ralf Gente, Dmitry TurchinovichAbstract:Several common polymers are characterized in the ultra-broadband Terahertz Frequency Window 2-15 THz using a THz time-domain spectrometer solely based on air-photonics. The spectral features relevant for materials science and THz photonics are revealed.
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Terahertz Brewster lenses
OPTICS EXPRESS, 2011Co-Authors: Matthias Wichmann, Sina Lippert, Stefan F. Busch, Benedikt Scherger, Steffen Schumann, Christian Jansen, Maik Scheller, Martin KochAbstract:Typical lenses suffer from Fresnel reflections at their surfaces, reducing the transmitted power and leading to interference phenomena. While antireflection coatings can efficiently suppress these reflections for a small Frequency Window, broadband antireflection coatings remain challenging. In this paper, we report on the simulation and experimental investigation of Brewster lenses in the THz-range. These lenses can be operated under the Brewster angle, ensuring reflection-free transmission of p-polarized light in an extremely broad spectral range. Experimental proof of the excellent focusing capabilities of the Brewster lenses is given by Frequency and spatially resolved focus plane measurements using a fiber-coupled THz-TDS system.
Norihiko Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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Observation of slow light in coupled-resonator-induced transparency
2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science, 2008Co-Authors: Kouki Totsuka, Norihiko Kobayashi, Makoto TomitaAbstract: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.
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slow light in coupled resonator induced transparency
Physical Review Letters, 2007Co-Authors: Kouki Totsuka, Norihiko Kobayashi, Makoto TomitaAbstract: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.
