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Article Dans Une Revue Scientific Reports Année : 2019

Microscale Temperature Shaping Using Spatial Light Modulation on Gold Nanoparticles

Ljiljana Durdevic
  • Fonction : Auteur
Hadrien M L Robert
  • Fonction : Auteur
Benoit Wattellier
  • Fonction : Auteur
Serge Monneret
Guillaume Baffou

Résumé

Heating on the microscale using focused lasers gave rise to recent applications, e.g., in biomedicine, biology and microfluidics, especially using gold nanoparticles as efficient nanoabsorbers of light. However, such an approach naturally leads to nonuniform, Gaussian-like temperature distributions due to the diffusive nature of heat. Here, we report on an experimental means to generate arbitrary distributions of temperature profiles on the micrometric scale (e.g. uniform, linear, parabolic, etc) consisting in illuminating a uniform gold nanoparticle distribution on a planar substrate using spatially contrasted laser beams, shaped using a spatial light modulator (SLM). We explain how to compute the light pattern and the sLM interferogram to achieve the desired temperature distribution, and demonstrate the approach by carrying out temperature measurements using quantitative wavefront sensing. Heating over a microscale area is becoming an important concept with the development of nano-and microtech-nologies. In particular, heating gold nanoparticles by light absorption is at the basis of a more and more active field of research named thermoplasmonics 1,2 , addressing problems in biology 3-5 , biomedicine 6-8 , microscale fluid dynamics 9,10 , phase transitions (bubbles) 11-15 , thermophoresis 16,17 or chemistry 18-20. The task of measuring the temperature on the microscale is now well-mastered by numerous optical micros-copy techniques 1,21 , usually based on fluorescence measurements, more rarely label-free 22-25 , sometimes even in three dimensions 26 , and with a diffraction-limited spatial resolution. However, controlling the temperature spatial distribution is, for the time being, overlooked. Light-heating of gold nanoparticle distributions usually results in non-uniform, Gaussian-like profiles, due to the diffusive nature of heat 27. Yet, for some applications, the temperature spatial profile can play an important role. For instance, any temperature gradient can generate important thermophoretic forces on colloids dispersed in liquids 16,17,28 , or non-uniform temperatures may be detrimental when working with biological systems, sensitive to temperature variations of typically 0.5 K 4. For such applications, it would be important to accurately monitor the gradients or control the uniformity of the microscale temperature profile. In a previous work, we achieved microscale temperature shaping at will by illuminating sophisticated and non-uniform nanoparticle distributions, made by e-beam lithography, using uniform laser beams 29. Albeit effective , this approach suffers from a lack of flexibility: each lithographied area is associated with a predefined temperature profile that could neither be dynamically changed, nor moved to any other area of interest. This may be a stringent constraint for instance in applications involving living cells in culture, whose position can never be predicted in advance. In this article, we introduce an experimental procedure to dynamically generate distributions of temperature profiles on the micrometric scale with arbitrary complexity by illuminating a uniform gold nanoparticle distribution using spatially contrasted laser beams, shaped using a spatial light modulator (SLM). We explain hereinafter how to compute the light pattern and the SLM interferogram to achieve the desired temperature distributions, explain the benefits of using gold nanoparticles and demonstrate the approach by carrying out temperature measurements using quantitative phase imaging. A final part is dedicated to an illustration of the interest of this approach for the field of thermophoresis of colloids.
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hal-02073966 , version 1 (24-11-2019)

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Ljiljana Durdevic, Hadrien M L Robert, Benoit Wattellier, Serge Monneret, Guillaume Baffou. Microscale Temperature Shaping Using Spatial Light Modulation on Gold Nanoparticles. Scientific Reports, 2019, 9 (1), ⟨10.1038/s41598-019-40382-3⟩. ⟨hal-02073966⟩
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