期刊
SMALL
卷 17, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202006764
关键词
nanoparticles; optical trapping; photonic nanojet; thermal stability; upconversion
类别
资金
- Ministerio de Ciencia e Innovacion de Espana [PID2019-106211RB-I00, PID2019-105195RA-I00]
- Universidad Autonoma de Madrid
- Comunidad Autonoma de Madrid [SI1/PJI/2019-00052]
- China Scholarship Council [201808350097]
- Carl Tryggers Foundation [CTS18:229]
- Spanish Ministerio de Ciencia e Innovacion, through the Maria de Maeztu Programme for Units of Excellence in RD [CEX2018-000805-M]
- MELODIA [PGC2018-095777-B-C22]
This study demonstrates stable optical trapping of a single UCNP in the temperature range of 20-90 degrees Celsius using a photonic nanojet, overcoming previous temperature limitations and enhancing the optical trapping effect.
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 degrees C range. In this work, stable optical trapping of a single UCNP in the 20-90 degrees 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.
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