TY - JOUR
T1 - Chemical Control Over Optical Trapping Force at an Interface
AU - Bresolí-Obach, Roger
AU - Nonell, Santi
AU - Masuhara, Hiroshi
AU - Hofkens, Johan
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/9/5
Y1 - 2022/9/5
N2 - So far, the optical trapping potential is controlled by tuning the physical conditions of the system. Herein, for the first time, an approach, in which the induced optical force or optical potential is controlled, by an external chemical stimulus, is reported. The key to realize this is to design an optical trapping condition in conjunction with resonant excitation, the so-called optical resonance effect (ORE). For this purpose, phenalenone, a well-known triplet photosensitizer, is embedded inside polystyrene particles. The optical resonance effect is achieved through a two-laser system: a 405 nm widefield laser to excite the phenalenone molecules to T1 state and a 488 nm trapping laser to induce the T1–Tn–T1 resonance cycle. Thus, the triplet state is mainly responsible for the optical force enhancement. Since oxygen is an excellent triplet quencher, the triplet populations, and hence, the optical force is controlled by changing the dissolved oxygen concentration. The results presented here pave the way to chemically control the optical force through ORE with promising applications in several research fields ranging from physics to biology.
AB - So far, the optical trapping potential is controlled by tuning the physical conditions of the system. Herein, for the first time, an approach, in which the induced optical force or optical potential is controlled, by an external chemical stimulus, is reported. The key to realize this is to design an optical trapping condition in conjunction with resonant excitation, the so-called optical resonance effect (ORE). For this purpose, phenalenone, a well-known triplet photosensitizer, is embedded inside polystyrene particles. The optical resonance effect is achieved through a two-laser system: a 405 nm widefield laser to excite the phenalenone molecules to T1 state and a 488 nm trapping laser to induce the T1–Tn–T1 resonance cycle. Thus, the triplet state is mainly responsible for the optical force enhancement. Since oxygen is an excellent triplet quencher, the triplet populations, and hence, the optical force is controlled by changing the dissolved oxygen concentration. The results presented here pave the way to chemically control the optical force through ORE with promising applications in several research fields ranging from physics to biology.
KW - optical force
KW - optical resonance effect
KW - optical trapping
KW - phenalenone
KW - smart materials
KW - triplet states
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U2 - 10.1002/adom.202200940
DO - 10.1002/adom.202200940
M3 - Article
AN - SCOPUS:85131841659
SN - 2195-1071
VL - 10
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 17
M1 - 2200940
ER -