Femtosecond Transient Absorption Spectroscopy of Single-Walled Carbon Nanotubes and their Ultrafast Optical Switching Behavior

2007 ◽  
pp. 905-908
Author(s):  
J.P. Yang ◽  
Manfred M. Kappes ◽  
H. Hippler ◽  
Andreas N. Unterreiner
Keyword(s):  
Carbon Nanotubes ◽  
Optical Switching ◽  
Transient Absorption ◽  
Single Walled Carbon Nanotubes ◽  
Transient Absorption Spectroscopy ◽  
Switching Behavior ◽  
Ultrafast Optical ◽  
Femtosecond Transient Absorption ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Walled Carbon Nanotubes

Femtosecond Transient Absorption Spectroscopy of Single-Walled Carbon Nanotubes and their Ultrafast Optical Switching Behavior

2007 ◽  
Vol 121-123 ◽  
pp. 905-908 ◽  
Author(s):  
J.P. Yang ◽  
Manfred M. Kappes ◽  
H. Hippler ◽  
Andreas N. Unterreiner
Keyword(s):  
Absorption Spectroscopy ◽  
Optical Switching ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Switching Behavior ◽  
Ultrafast Optical ◽  
Decay Component ◽  
Femtosecond Transient Absorption ◽  
Pump And Probe ◽  
Walled Carbon Nanotubes

Two types of individualized single-walled nanotubes (SWNTs) in aqueous surfactant suspensions have been studied by femtosecond two-color absorption spectroscopy. A careful selection of pump and probe wavelengths allows for the determination of the “intrinsic” lifetimes of the lowest excited states which depend on the diameter of the SWNTs. Furthermore, a fast decay component in the ps to sub-ps regime was also observed and tentatively attributed to bundle relaxation. Likewise, this experimental approach can also assess spectral regions with decays faster than 1 ps, which is of great interest for all-optical switching devices near the optical telecommunication wavelength.

scholarly journals Ultrafast nonequilibrium dynamic process of separate electron and hole during exciton formation in few-layer tungsten disulfide

2021 ◽  
Author(s):  
Junjie Chen ◽  
Sen Guo ◽  
Dabin Lin ◽  
Zhaogang Nie ◽  
Chung-Che Huang ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Dynamic Process ◽  
Formation Process ◽  
Transient Absorption ◽  
Tungsten Disulfide ◽  
Transient Absorption Spectroscopy ◽  
Femtosecond Transient Absorption ◽  
Nonequilibrium Dynamic ◽  
Femtosecond Transient Absorption Spectroscopy ◽  
Separate Electron

Femtosecond transient absorption spectroscopy has been employed to unravel separate initial nonequilibrium dynamic process of photo-injected electrons and holes during the formation process of the lowest excitons at the K-valley...

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