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Updated: Dec 25, 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

Resonant scattering-enhanced photothermal microscopy.

Qiang Li¹, Zhonghong Shi, Lijun Wu

¹Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China. ljwu@scnu.edu.cn.

|April 3, 2020

Summary

Researchers developed resonant scattering-enhanced photothermal (PT) microscopy for detecting nano-objects. This novel method significantly amplifies the PT signal from plasmonic nanoparticles near optical resonance, enabling ultra-high sensitivity imaging.

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Last Updated: Dec 25, 2025

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Published on: July 17, 2016

Area of Science:

Nanotechnology
Optical Microscopy
Spectroscopy

Background:

Photothermal (PT) microscopy excels at detecting non-fluorescent nano-objects via absorption.
Current PT methods often use non-resonant nano-objects, relying on thermal lensing effects.
Sensitivity is limited by the indirect generation of the PT signal.

Purpose of the Study:

To develop a novel resonant scattering-enhanced PT microscopy strategy.
To improve the sensitivity and detection capabilities of PT microscopy for nano-objects.
To leverage optical resonance for enhanced signal generation.

Main Methods:

Implemented resonant scattering-enhanced PT microscopy using gold nanorods (NRs).
Tuned gold NRs to be near-resonant with the probe laser light.
Analyzed the PT signal variations near the resonance wavelength.

Main Results:

Observed dramatic PT signal variations within a narrow 15 nm resonance wavelength range.
Achieved up to a 43-fold enhancement in PT signal amplitude compared to non-resonant NRs.
Demonstrated resonant scattering-enhanced PT imaging of plasmonic nanoparticles.

Conclusions:

The novel strategy significantly enhances PT signal amplitude through resonant scattering.
Heat-induced changes in polarizability are the primary cause of the strong PT signal.
This work paves the way for ultra-high sensitivity PT microscopy in complex environments.