Nonlinear optical trapping effect with reverse saturable absorption
Z. Zhu (Zhejiang Lab, Shenzhen University, TU Delft - ImPhys/Adam group)
Yuquan Zhang (TU Delft - ImPhys/Optics)
Shuoshuo Zhang (Shenzhen University)
Aurlé Adam (TU Delft - ImPhys/Adam group)
Changjun Min (Shenzhen University)
HP Urbach (TU Delft - ImPhys/Stallinga group)
Xiaocong Yuan (Zhejiang Lab, Shenzhen University)
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Abstract
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.
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