Probing millikelvin temperature sensitivity in chiral nanoparticles via optical forces
Source abstract
Abstract
With increasing interest in utilizing nanostructures as nanoscale heat sources, the ability to precisely measure photothermal effects at the nanoscale has become increasingly significant. Techniques based on fluorescence or Raman signals often suffer from challenges in accurate calibration; far-field imaging methods are limited by diffraction-limited spatial resolution; and electron microscopy requires vacuum conditions, restricting in situ applicability. In contrast, tip-based measurement techniques offer sub-diffraction spatial resolution under ambient conditions, making them well-suited for nanoscale photothermal mapping. In this study, we employ tip-based optical force nanoscopy combined with phase-informed decomposition to investigate the origin of the photothermal force, enable nanoscale mapping, and evaluate temperature sensitivity. Our system achieves a temperature sensitivity of ∼0.1 K without necessitating an additional temperature-sensitive layer. We anticipate that our approach has the potential to serve as a versatile platform for investigating localized thermal effects in fields such as semiconductors, nanophotonics, and photocatalysis.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Mechanical and Optical Resonators · Force Microscopy Techniques and Applications · Thermal properties of materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Nick Holonyak Micro and Nanotechnology Laboratory, University of Illinois Urbana-Champaign 1 , Urbana, Illinois 61801,
Department of Bioengineering, The Grainger College of Engineering, University of Illinois Urbana-Champaign 2 , Urbana, Illinois 61801,
Department of Chemistry, University of Illinois Urbana-Champaign 3 , Urbana, Illinois 61801,
Carl R. Woese Institute of Genomic Biology, University of Illinois Urbana-Champaign 4 , Urbana, Illinois 61801,
Department of Electrical and Computer Engineering, The Granger College of Engineering, University of Illinois Urbana-Champaign 5 , Urbana, Illinois 61801,
Cancer Center at Illinois, University of Illinois Urbana-Champaign 6 , Urbana, Illinois 61801,
Beckman Institute, University of Illinois Urbana-Champaign 7 , Urbana, Illinois 61801,
Translational Sciences, Carle Illinois College of Medicine, University of Illinois Urbana-Champaign 8 , Urbana, Illinois 61801,
Funding
National Institute of General Medical Sciences
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