What is it about?
We report on transient absorption experiments performed at high optical excitation fluences and used to study the ultrafast dynamics in graphene. We observed saturable absorption (SA) and fluence-dependent relaxation times. We see that the ultrafast carrier dynamics is composed by two decay mechanisms, one with response time of about 200 fs and a slower process of about 1 ps. The fast decay, due to both carrier-carrier and carrier-optical phonon scattering, becomes slower when the density of excited carrier was increased.
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Why is it important?
Graphene is a new material potentially applicable to electronics and photonics. For high bandwidth applications it is essential to understand the behavior of optically excited electrons in graphene.
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This page is a summary of: Effect of high-optical excitation on the ultrafast electron dynamics in stacked-monolayer graphene samples, May 2016, SPIE,
DOI: 10.1117/12.2235501.
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