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This book highlights the theoretical foundations of and experimental techniques in photothermal heating and applications involving nanoscale heat generation using gold nanostructures embedded in various media. The experimental techniques presented involve a combination of nanothermometers doped with rare-earth atoms, plasmonic heaters and near-field microscopy. The theoretical foundations are based on the Maxwell's and heat diffusion equations. In particular, the working principle and application of AlGaN:Er3+ film, Er2O3 nanoparticles and beta-NaYF4:Yb3+,Er3+ nanocrystals for nanothermometry based on Er3+ emission are discussed. The relationship between superheated liquid and bubble formation for optically excited nanostructures and the effects of the surrounding medium and solution properties on light absorption and scattering are presented. The application of Er2O3 and beta-NaYF4:Yb3+,Er3+ nanocrystals to study the temperature of optically heated gold nanoparticles is also presented. In closing, the book presents a new thermal imaging technique combining near-field microscopy and Er3+ photoluminescence spectroscopy to monitor the photothermal heating and steady-state sub-diffraction local temperature of optically excited gold nanostructures.

Photo-Thermal Spectroscopy with Plasmonic and Rare-Earth Doped (Nano)Materials: Basic Principles and Applications

1. Introduction.   

2. Background and theory of photothermal heat generation by optically excited plasmonic nanostructures.

3. Nanoscale Temperature Measurement under Optical Illumination using AlGaN:Er³⁺ Photoluminescence Nanothermometry

4. Comparison of Nucleation Behavior of Surrounding Water Under Optical Excitation of Single Gold Nanostructure and Colloidal Solution  

5. Effect of Ions and Ionic Strength on Surface Plasmon Extinction Properties of Single Plasmonic Nanostructures

6. Photothermal Heating Study using Er₂O₃ Photoluminescence Nanothermometry

7. Nanoscale Temperature Study of Plasmonic Nanoparticles using NaYF₄:Yb³⁺:Er³⁺ Upconverting Nanoparticles

8. Near Field Nanoscale Temperature Measurement using AlGaN:Er³⁺ Film via Photoluminescence Nanothermometry