Nonlinear optical trapping effect with reverse saturable absorption

Zheng Zhu, Yuquan Zhang*, Shuoshuo Zhang, Aurèle J.L. Adam, Changjun Min, Hendrik Paul Urbach*, Xiaocong Yuan*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers. With the gradual increase in optical intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise in sequence and thereby modulate the nonlinear properties of materials. In current nonlinear optical traps, however, the underlying physical mechanism is mainly confined within the SA regime because threshold values required to excite the RSA regime are extremely high. Herein, we demonstrate, both in theory and experiment, nonlinear optical tweezing within the RSA regime, proving that a fascinating composite trapping state is achievable at ultrahigh intensities through an optical force reversal induced through nonlinear absorption. Integrated results help in perfecting the nonlinear optical trapping system, thereby providing beneficial guidance for wider applications of nonlinear optics.

Original languageEnglish
Article number046006
Number of pages8
JournalAdvanced Photonics
Issue number4
Publication statusPublished - 2023


  • nonlinear optical tweezers
  • optical force
  • reverse saturable absorption

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