Abstract:

In article number 1800072, Josué J. López and co‐workers use photothermal microscopy to measure the near‐field absorption of nanostructured hexagonal boron nitride (h‐BN) and reveal a large photothermal expansion in the nanostructures. This effect is attributed to the anisotropy of the thermal expansion coefficients of h‐BN and the nanostructuring implemented. The photothermal expansion should be present in other van der Waals materials and may lead to nanomechanical switches driven by light.

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