Real Space Imaging of Transient Carrier Dynamics by Femtosecond Time-Resolved STM Case Study
●"Smaller and faster" are the key words for nanoscience and nanotechnology. Therefore there is a strong need for methods able to explore transient dynamics in small organized nanostructures. In this white paper we discuss nano-scale imaging of carrier dynamics over a wide range of lifetimes by femtosecond lasers combined with scanning tunneling microscopy (STM).
●The real space observation of atomic-scale structures by STM has revealed answers to various long-standing questions and is pushing the frontiers of science and technology. However, since the temporal resolution of STM is less than 100 kHz, ultrafast transient dynamics have been well beyond its limits. Conversely, the development of ultrashort-pulse laser technology enabled us to observe dynamics in the femtosecond timescale. However, spatial resolution with conventional pump & probe techniques is generally limited by the laser wavelength employed. Therefore, since the invention of the STM in 1982, one of the most challenging goals has been to combine the spatial resolution of STM with the time-resolution afforded by femtosecond lasers.
●In the Shigekawa Lab, we are always looking for different approaches to tackle new research themes. And one of the ground-breaking results we have achieved has been the extension of STM to the ultrafast domain by developing a time-resolved set-up that combines a STM and femtosecond lasers by Coherent (Chameleon and Mira).
●By adopting new ways to combine these two devices, we have realized angstrom-level microscopy with unprecedented femtosecond- time resolution.
■Summary
●We have shown that femtosecond optical pulses can be combined with STM technology to enable the dynamics of materials to be studied with an unprecedented combination of temporal and spatial resolution. This type of data can lead to improved understanding of fast nanoscale excitation events, potentially enabling better electronic and photonic devices. The availability of stable femtosecond lasers with stable timing control is a key facilitating technology in this work.
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[ Transient Carrier Dynamics ][ nanoscience ][ nanotechnology ][ nano-scale imaging ] |
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Case Study |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/8/11 |
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MC0119 |
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1.3 MB |
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