Quantitative Temperature Measurements in Gold Nanorods Using Digital Holography

Abstract

Temperature characterization and quantification at the nanoscale remain core challenges in applications based on photoinduced heating of nanoparticles. Here, we propose a new approach to obtain quantitative temperature measurements on individual nanoparticles by combining modulated photothermal stimulation and heterodyne digital holography. From full-field reconstructed holograms, temperature is determined with a precision of 0.3 K via a simple approach without requiring any calibration or fitting parameters. As an application, the dependence of temperature on the aspect ratio of gold nanoparticles is investigated. A good agreement with numerical simulation is observed.

Photothermal extracellular matrix based nanocomposite films and their effect on the osteogenic differentiation of BMSCs

“…Of course, as one of the commonly used nano-photothermal materials, graphene could be replaced by other materials of similar size and properties, such as black phosphorus nanosheets 60 and gold nanoparticles. 61 Furthermore, this innovative way of extracellular matrix functionalization can be extended to other external fields such as a magnetic field and electric field, as long as the particles with the corresponding external field properties are of suitable size and non-cytotoxic. In addition, these nanocomposites must be safely metabolizable in vivo , as potential degradation of the ECM after long-term implantation could detach the composite nanoparticles from the film.…”

Holographic Recording of Unslanted Volume Transmission Gratings in Acrylamide/Propargyl Acrylate Hydrogel Layers: Towards Nucleic Acids Biosensing

“…A holography-based transduction method has been successfully demonstrated for the detection of biomolecules, volatile organic compounds and metal ions [ 15 ]. For example, volume holographic gratings (VHGs) based on hydrogels as a sensing platforms have been widely employed for the measure of pH [ 16 ], humidity and temperature [ 17 , 18 ], metal ions [ 19 , 20 ], and glucose [ 21 , 22 ]. However, to our knowledge, the direct detection of oligonucleotides has not yet been performed by holographic sensing.…”