Third-order nonlinear optical response in double-walled carbon nanotubes

Nakamura, Arao; Hikosaka, Naoki; Imamura, S.; Takahashi, Yosuke; Ago, Hiroki; Kishida, Hideo

doi:10.1016/j.jlumin.2009.02.027

Cited by 5 publications

(10 citation statements)

References 19 publications

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“…DWNTs, formed by two concentric SWNTs 55 , offer strong third-order optical nonlinearity comparable to those of SWNTs 56 and broadband absorption 57 . The combination of metallic (m-) and semiconducting (s-) inner and outer walls increases their carrier relaxation speed due to tunnelling from s- to m-tubes 58 .…”

Section: Methodsmentioning

confidence: 99%

Double-Wall Carbon Nanotube Hybrid Mode-Locker in Tm-doped Fibre Laser: A Novel Mechanism for Robust Bound-State Solitons Generation

Chernysheva

Bednyakova

Araimi

et al. 2017

Sci Rep

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The complex nonlinear dynamics of mode-locked fibre lasers, including a broad variety of dissipative structures and self-organization effects, have drawn significant research interest. Around the 2 μm band, conventional saturable absorbers (SAs) possess small modulation depth and slow relaxation time and, therefore, are incapable of ensuring complex inter-pulse dynamics and bound-state soliton generation. We present observation of multi-soliton complex generation in mode-locked thulium (Tm)-doped fibre laser, using double-wall carbon nanotubes (DWNT-SA) and nonlinear polarisation evolution (NPE). The rigid structure of DWNTs ensures high modulation depth (64%), fast relaxation (1.25 ps) and high thermal damage threshold. This enables formation of 560-fs soliton pulses; two-soliton bound-state with 560 fs pulse duration and 1.37 ps separation; and singlet+doublet soliton structures with 1.8 ps duration and 6 ps separation. Numerical simulations based on the vectorial nonlinear Schr¨odinger equation demonstrate a transition from single-pulse to two-soliton bound-states generation. The results imply that DWNTs are an excellent SA for the formation of steady single- and multi-soliton structures around 2 μm region, which could not be supported by single-wall carbon nanotubes (SWNTs). The combination of the potential bandwidth resource around 2 μm with the soliton molecule concept for encoding two bits of data per clock period opens exciting opportunities for data-carrying capacity enhancement.

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Section: Methodsmentioning

confidence: 99%

Double-Wall Carbon Nanotube Hybrid Mode-Locker in Tm-doped Fibre Laser: A Novel Mechanism for Robust Bound-State Solitons Generation

Chernysheva

Bednyakova

Araimi

et al. 2017

Sci Rep

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confidence: 99%

“…60,61 Indeed, experimental observations indicate that the relaxation times of inner nanotubes of DWNTs are comparable or shorter 60,62,63 than the SWNTs of same species. For example, Nakamura et al 57 showed that, under the same experimental conditions, the exciton decay time for (7,6) inner tubes in DWNTs is 0.65 ps, compared to 3.2 ps for a (7,6) SWNT species due to shorter exciton decay time and energy relaxation from inner to outer tubes 57 via exciton energy transfer (EET). 64,65 The strong third-order optical nonlinearity, ultrafast carrier dynamics, 48,55À57,63 and wide optical absorption 57,66 make DWNTs with ∼1.6À1.8 nm outer diameter very attractive for ultrafast photonic applications in the 1 to 2 μm range.…”

mentioning

confidence: 99%

“…For example, Nakamura et al 57 showed that, under the same experimental conditions, the exciton decay time for (7,6) inner tubes in DWNTs is 0.65 ps, compared to 3.2 ps for a (7,6) SWNT species due to shorter exciton decay time and energy relaxation from inner to outer tubes 57 via exciton energy transfer (EET). 64,65 The strong third-order optical nonlinearity, ultrafast carrier dynamics, 48,55À57,63 and wide optical absorption 57,66 make DWNTs with ∼1.6À1.8 nm outer diameter very attractive for ultrafast photonic applications in the 1 to 2 μm range. With an interwall distance of ∼0.36À0.38 nm, 67,68 the diameter difference between inner and outer tubes is ∼0.7À0.8 nm.…”

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confidence: 99%

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Double-Wall Carbon Nanotubes for Wide-Band, Ultrafast Pulse Generation

Hasan

Sun

Tan³

et al. 2014

ACS Nano

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We demonstrate wide-band ultrafast optical pulse generation at 1, 1.5, and 2 μm using a single-polymer composite saturable absorber based on double-wall carbon nanotubes (DWNTs). The freestanding optical quality polymer composite is prepared from nanotubes dispersed in water with poly(vinyl alcohol) as the host matrix. The composite is then integrated into ytterbium-, erbium-, and thulium-doped fiber laser cavities. Using this single DWNT–polymer composite, we achieve 4.85 ps, 532 fs, and 1.6 ps mode-locked pulses at 1066, 1559, and 1883 nm, respectively, highlighting the potential of DWNTs for wide-band ultrafast photonics.

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“…41,42,44 Further recent studies for cross-polarized excitons revealed that dark excitons, located below bright excitons in energy, become optically allowed due to weak electron-hole asymmetry. [45][46][47] Optical spectra of carbon nanotubes have been measured in various environments such as for self-assembled tubes, 3,5,[48][49][50] tubes suspended in air, 4,7,8,10,12,51 and tubes in the presence of surrounding materials such as surfactants and solvents. 1,3,6,7,9,11,[13][14][15][16]34 It has often been shown that exciton energies in the above environments are reduced in comparison with those in tubes in air or vacuum.…”

Section: Introductionmentioning

confidence: 99%

Environment effect on cross-polarized excitons in carbon nanotubes

Uryu

Ando

2012

Phys. Rev. B

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Effects of environmental dielectric materials on cross-polarized excitons of semiconducting carbon nanotubes are theoretically studied in an effective-mass scheme. When a nanotube is surrounded by a medium, the bright exciton, shifted to the high-energy side by depolarization effect, becomes weaker and disappears with the increase of the dielectric constant. When a nanotube contains a medium inside, the bright exciton becomes more eminent. The dark exciton, brightened due to electron-hole asymmetry, is enhanced with the increase of the dielectric constant both for outside and inside materials. Consequently, the relative intensity of the brightened dark exciton normalized by the bright exciton is strongly enhanced by environmental screening, in particular, for outside materials.

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Third-order nonlinear optical response in double-walled carbon nanotubes

Cited by 5 publications

References 19 publications

Double-Wall Carbon Nanotube Hybrid Mode-Locker in Tm-doped Fibre Laser: A Novel Mechanism for Robust Bound-State Solitons Generation

Double-Wall Carbon Nanotube Hybrid Mode-Locker in Tm-doped Fibre Laser: A Novel Mechanism for Robust Bound-State Solitons Generation

Double-Wall Carbon Nanotubes for Wide-Band, Ultrafast Pulse Generation

Environment effect on cross-polarized excitons in carbon nanotubes

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