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Nanojet Trapping of a Single Sub‐10 nm Upconverting Nanoparticle in the Full Liquid Water Temperature Range
Author(s) -
Lu Dasheng,
Pedroni Marco,
LabradorPáez Lucía,
Marqués Manuel I.,
Jaque Daniel,
HaroGonzález Patricia
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202006764
Subject(s) - trapping , materials science , optical tweezers , photonics , nanoparticle , range (aeronautics) , optoelectronics , trap (plumbing) , thermal , thermal stability , diffraction , nanotechnology , optics , physics , ecology , quantum mechanics , meteorology , composite material , biology
Upconverting nanoparticles (UCNPs) have been used as optical probes in a great variety of scenarios ranging from cells to animal models. When optically trapped, a single UCNP can be remotely manipulated making possible, for instance, thermal scanning in the surroundings of a living cell. When conventional optics is used, the stability of an optically trapped UCNP is very limited. Its reduced size leads to optical potentials comparable to thermal energy, and up to now, stable optical trapping of a UCNP has been demonstrated only close to room temperature. This fact limits their use above room temperature, for instance, the use to investigate protein denaturalization that occurs in the 40–50 °C range. In this work, stable optical trapping of a single UCNP in the 20–90 °C range has been demonstrated by using a photonic nanojet. The use of an optically trapped microsphere makes it possible to overcome the diffraction limit producing another optical trap of smaller size and enhanced strength. This simple strategy leads not only to an improvement in the thermal stability of the optical trap but also to an enhancement of the emission intensity generated by the optically trapped UCNP.