Fluorescent nano-particles for multi-photon thermal sensing

• Published in: Journal of luminescence Vol. 133; no. 1; pp. 249 - 253
• Main Authors: Jaque, D., Maestro, L.M., Escudero, E., Rodríguez, E. Martín, Capobianco, J.A., Vetrone, F., Juarranz de la Fuente, A., Sanz-Rodríguez, F., Iglesias-de la Cruz, M.C., Jacinto, C., Rocha, U., García Solé, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-01-2013; Elsevier
• Subjects: Bands; Bio-photonics; Cadmium tellurides; Confocal microscopy; Cross-disciplinary physics: materials science; rheology; Detection; Exact sciences and technology; Excitation; Fluid dynamics; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Luminescence; Materials science; Nanocrystals; Nanoscale materials and structures: fabrication and characterization; Nanostructure; Nanothermometry; Physics; Quantum dots; Rare earth doped nano-crystals; Thermal instruments, apparatus and techniques; Thermometry; Two-photon luminescence; Nanothermometry; Rare earth doped nano-crystals; Confocal microscopy; Two-photon luminescence; Quantum dots; Bio-photonics; Inorganic compounds; Luminescence; Sensor materials; Photonics; Nanoparticles; Cadmium tellurides; Optical focusing; Two-photon processes; Nanocrystal; Sodium Yttrium Fluorides Mixed; Transition element compounds; Doped materials; Binary compounds; Multi-photon processes; Thermometers; Ytterbium additions; II-VI semiconductors; Nanostructured materials; Erbium additions; Codoping
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2011.12.022

In this work we report on the ability of Er/Yb co-doped NaYF4 nano-crystals and CdTe Quantum Dots as two-photon excited fluorescent nano-thermometers. The basic physical phenomena causing the thermal sensitivity of the two-photon excited emission bands have been discussed and the maximum thermal resolution achievable in each case has been estimated. The practical application of both systems for thermal sensing at the micro-scale in biological systems is demonstrated. In particular, they have been used to evaluate the thermal loading induced by tightly focused laser beams in both living cells and fluids.
► Two-photon-excited optical probes capable of thermal sensing are introduced. ► The physics at the basis of thermal sensing is identified for each case. ► Optical nano-thermometers are used to determine laser induced heating in cells and fluids.