Visualizing ultrafast photothermal dynamics with decoupled optical force nanoscopy

Hanwei Wang, Sean M. Meyer, Catherine J. Murphy, Yun-Sheng Chen and Yang Zhao ()
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Hanwei Wang: University of Illinois Urbana-Champaign
Sean M. Meyer: University of Illinois Urbana-Champaign
Catherine J. Murphy: University of Illinois Urbana-Champaign
Yun-Sheng Chen: University of Illinois Urbana-Champaign
Yang Zhao: University of Illinois Urbana-Champaign

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The photothermal effect in nanomaterials, resulting from resonant optical absorption, finds wide applications in biomedicine, cancer therapy, and microscopy. Despite its prevalence, the photothermal effect in light-absorbing nanoparticles has typically been assessed using bulk measurements, neglecting near-field effects. Beyond standard imaging and therapeutic uses, nanosecond-transient photothermal effects have been harnessed for bacterial inactivation, neural stimulation, drug delivery, and chemical synthesis. While scanning probe microscopy and electron microscopy offer single-particle imaging of photothermal fields, their slow speed limits observations to milliseconds or seconds, preventing nanoscale dynamic investigations. Here, we introduce decoupled optical force nanoscopy (Dofn), enabling nanometer-scale mapping of photothermal forces by exploiting unique phase responses to temporal modulation. We employ the photothermal effect’s back-action to distinguish various time frames within a modulation period. This allows us to capture the dynamic photothermal process of a single gold nanorod in the nanosecond range, providing insights into non-stationary thermal diffusion at the nanoscale.

Date: 2023
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DOI: 10.1038/s41467-023-42666-9

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