New Ultrafast Optical Probe
A new ultrafast optical probe could pave the way for petahertz electronics.
The Bandgap Property
In the world of solid materials, one property shapes almost everything about how they behave: the bandgap. This is the tiny but critical energy difference between the highest occupied electronic state (the valence band) and the lowest empty state (the conduction band).
The bandgap determines whether a material is an insulator, a conductor, or a semiconductor, and it governs how the material interacts with light and electricity.
Ultrafast Changes
When a material is hit with intense light, such as a strong laser pulse, its bandgap can temporarily shrink or expand. Tracking these ultrafast changes has long been a challenge, because the action happens on unimaginably small timescales—just femtoseconds, or millionths of a billionth of a second.
Author's summary: New optical probe enables petahertz electronics research.
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