The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
S Takeyama - One of the best experts on this subject based on the ideXlab platform.
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survey of exciton phonon Sidebands by magneto optical spectroscopy using highly specified 6 5 single walled carbon nanotubes
Applied Physics Letters, 2013Co-Authors: Weihang Zhou, Tatsuya Sasaki, Daisuke Nakamura, Hiroaki Saito, Huaping Liu, Hiromichi Kataura, S TakeyamaAbstract:We report high-field magneto-optical study on the exciton-phonon sideband of single-walled carbon nanotubes consisting only of (6,5) species. Both energy and intensity of the observed phonon sideband were found to be independent of the external magnetic field. Comparing with theoretical calculations, we confirmed that these Sidebands originate from the optically forbidden K-momentum singlet excitons. Energy of these K-momentum dark excitons was estimated to be ∼21.5 meV above the bright Γ-momentum singlet excitons, in close agreement with recent theoretical predictions and experimentally determined values.
Xiong Shen - One of the best experts on this subject based on the ideXlab platform.
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filamentation assisted generation of tunable multicolored femtosecond Sidebands based on cascaded four wave mixing
Laser Physics, 2015Co-Authors: Peng Wang, Jun Liu, Xiong ShenAbstract:Tunable intense multicolored femtosecond Sidebands are generated in a 0.1 mm-thick sapphire plate based on cascaded four-wave mixing (CFWM) by using a spectrally broadened pulse from filamentation in air and a 806 nm fundamental pulse from a Ti:sapphire laser amplifier. By using the filamentation to extend the spectrum of one incident pulse, the experimental setup is compact and inexpensive. Furthermore, the spectra of the Sidebands can be conveniently tuned by varying the input power for the filamentation generation, and even the second-order frequency upconversion sideband can maintain its output power higher than 0.2 mW during the process of tuning. The generated Sidebands are observed with a spectral range from 500 to 950 nm, and each spectrum has a full width half maximum (FWHM) bandwidth above 37 nm, which have potential applications in ultrafast spectroscopy and microscopy.
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generation of high energy tunable multicolored femtosecond Sidebands directly after a ti sapphire femtosecond laser
Applied Physics Letters, 2014Co-Authors: Peng Wang, Jun Liu, Xiong ShenAbstract:High-energy tunable multicolored femtosecond Sidebands are generated simultaneously in a 0.15-mm-thick sapphire plate by using cascaded four-wave mixing process directly after a 25-fs Ti:sapphire laser. The pulse energy of the first-order sideband can reach as high as 8 μJ. More than eight frequency up-conversion Sidebands and four frequency down-conversion Sidebands are observed with a spectral range from 550 to 950 nm. The experimental setup is simple and compact, which is fixed on a 30 × 30 cm2 plate board. It is attractive to various experiments that need multicolored femtosecond laser pulses.
Garry Rumbles - One of the best experts on this subject based on the ideXlab platform.
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confirmation of k momentum dark exciton vibronic Sidebands using 13c labeled highly enriched 6 5 single walled carbon nanotubes
Nano Letters, 2012Co-Authors: Jeffrey L Blackburn, Josh M Holt, Veronica M Irurzun, Daniel E Resasco, Garry RumblesAbstract:A detailed knowledge of the manifold of both bright and dark excitons in single-walled carbon nanotubes (SWCNTs) is critical to understanding radiative and nonradiative recombination processes. Exciton–phonon coupling opens up additional absorption and emission channels, some of which may “brighten” the Sidebands of optically forbidden (dark) excitonic transitions in optical spectra. In this report, we compare 12C and 13C-labeled SWCNTs that are highly enriched in the (6,5) species to identify both absorptive and emissive vibronic transitions. We find two vibronic Sidebands near the bright 1E11 singlet exciton, one absorptive sideband ∼200 meV above, and one emissive sideband ∼140 meV below, the bright singlet exciton. Both Sidebands demonstrate a ∼50 cm–1 isotope-induced shift, which is commensurate with exciton–phonon coupling involving phonons of A1′ symmetry (D band, ω ∼ 1330 cm–1). Independent analysis of each sideband indicates that both Sidebands arise from the same dark exciton level, which lies a...
Weihang Zhou - One of the best experts on this subject based on the ideXlab platform.
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survey of exciton phonon Sidebands by magneto optical spectroscopy using highly specified 6 5 single walled carbon nanotubes
Applied Physics Letters, 2013Co-Authors: Weihang Zhou, Tatsuya Sasaki, Daisuke Nakamura, Hiroaki Saito, Huaping Liu, Hiromichi Kataura, S TakeyamaAbstract:We report high-field magneto-optical study on the exciton-phonon sideband of single-walled carbon nanotubes consisting only of (6,5) species. Both energy and intensity of the observed phonon sideband were found to be independent of the external magnetic field. Comparing with theoretical calculations, we confirmed that these Sidebands originate from the optically forbidden K-momentum singlet excitons. Energy of these K-momentum dark excitons was estimated to be ∼21.5 meV above the bright Γ-momentum singlet excitons, in close agreement with recent theoretical predictions and experimentally determined values.
Peng Wang - One of the best experts on this subject based on the ideXlab platform.
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filamentation assisted generation of tunable multicolored femtosecond Sidebands based on cascaded four wave mixing
Laser Physics, 2015Co-Authors: Peng Wang, Jun Liu, Xiong ShenAbstract:Tunable intense multicolored femtosecond Sidebands are generated in a 0.1 mm-thick sapphire plate based on cascaded four-wave mixing (CFWM) by using a spectrally broadened pulse from filamentation in air and a 806 nm fundamental pulse from a Ti:sapphire laser amplifier. By using the filamentation to extend the spectrum of one incident pulse, the experimental setup is compact and inexpensive. Furthermore, the spectra of the Sidebands can be conveniently tuned by varying the input power for the filamentation generation, and even the second-order frequency upconversion sideband can maintain its output power higher than 0.2 mW during the process of tuning. The generated Sidebands are observed with a spectral range from 500 to 950 nm, and each spectrum has a full width half maximum (FWHM) bandwidth above 37 nm, which have potential applications in ultrafast spectroscopy and microscopy.
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generation of high energy tunable multicolored femtosecond Sidebands directly after a ti sapphire femtosecond laser
Applied Physics Letters, 2014Co-Authors: Peng Wang, Jun Liu, Xiong ShenAbstract:High-energy tunable multicolored femtosecond Sidebands are generated simultaneously in a 0.15-mm-thick sapphire plate by using cascaded four-wave mixing process directly after a 25-fs Ti:sapphire laser. The pulse energy of the first-order sideband can reach as high as 8 μJ. More than eight frequency up-conversion Sidebands and four frequency down-conversion Sidebands are observed with a spectral range from 550 to 950 nm. The experimental setup is simple and compact, which is fixed on a 30 × 30 cm2 plate board. It is attractive to various experiments that need multicolored femtosecond laser pulses.
