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Updated: Jun 30, 2025

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

Non-steady state thermometry with optical diffraction tomography.

Adarsh B Vasista¹, Bernard Ciraulo^1,2, Falko Schmidt¹

¹Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH-Zürich, 8092 Zürich, Switzerland.

Science Advances

|March 22, 2024

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This summary is machine-generated.

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This study introduces pump-probe optical diffraction tomography (ODT) for 3D temperature mapping at the single-particle level. This advanced label-free thermometry method overcomes limitations of existing techniques, enabling analysis of complex heat sources.

Area of Science:

Nanoscale science
Optical physics
Thermodynamics

Background:

Label-free thermometry is crucial but limited to planar, steady-state heat sources.
Current methods restrict the study of complex thermal landscapes.
Single-particle thermal analysis is often challenging.

Purpose of the Study:

To develop and validate a novel 3D label-free thermometry technique.
To enable precise temperature mapping of nonplanar heat sources and diffusing nanoparticles.
To extend the capabilities of thermal analysis in complex microenvironments.

Main Methods:

Utilized pump-probe optical diffraction tomography (ODT) for thermal mapping.
Systematically characterized thermal landscapes in gold nanorod microchamber models.

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Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Fabrication and Testing of Photonic Thermometers

Fabrication and Testing of Photonic Thermometers

Published on: October 24, 2018

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Last Updated: Jun 30, 2025

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

Published on: May 15, 2017

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping

Published on: November 7, 2016

Fabrication and Testing of Photonic Thermometers

Fabrication and Testing of Photonic Thermometers

Published on: October 24, 2018

Benchmarked ODT results against simulations and quantitative phase imaging thermometry.

Main Results:

Demonstrated accurate and precise 3D temperature mapping at the single-particle level.
Successfully resolved thermal landscapes of nonplanar heat sources.
Applied ODT thermometry to freely diffusing gold nanorods in microchambers.

Conclusions:

ODT thermometry offers a powerful new tool for label-free thermal analysis.
The method overcomes limitations of traditional thermometry for complex systems.
This technique is expected to advance studies requiring 3D or non-steady-state thermal characterization of nanoparticles.