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▲ [16a-PA01-7] Polarization Dependent Optical Trapping Dynamics of Mutual Scattering Gold Nanoparticles and Nanodisks at Glass/solution Interface
Keywords:Optical trapping, Gold nanoparticle, Electron beam lithography
Polarization Dependent Optical Trapping Dynamics of Mutual Scattering Gold Nanoparticles and Nanodisks at Glass/solution Interface
National Yang Ming Chiao Tung Univ., Taiwan1, Hokkaido Univ., Japan2
Mu-En Li1, Chih-Hao Huang1, Xu Shi2, Kosei Ueno2, Hiroaki Misawa1,2, Hiroshi Masuhara1
E-mail: a311654060.sc11@nycu.edu.tw
Non-contact technique of optical trapping is capable of gathering and manipulating nanometer to micrometer particles. Our group has demonstrated a single large assembly of 200 nm Au nanoparticles (NPs) by focusing 1064 nm trapping laser at the glass/solution interface.1 The assembly expands much larger than the focal area and presents a dumbbell-shaped structure. We call this phenomenon swarming.
In this work, we utilized electron beam lithography to fabricate periodically aligned Au nanodisk structure on the glass coverslip, mimicking the initial growing process of the swarming. Interestingly, Au NPs are likely to locate at specific spots above or below the fabricated structure with circularly polarized trapping laser in the scattering image, and they locate between the nanodisks when linearly polarized laser is used. Besides, an assembly of few Au NPs under circularly polarized laser shows rotational motion outside the nanodisks, while it is suppressed among the nanodisks. These behaviors are also observed with different size of Au NPs; however, by replacing Au NPs with polystyrene (PS) NPs, specific trapping sites are not observed. This is because the scattered light from both Au NPs and nanodisks plays important roles in generation of specific trapping sites.
1. Tetsuhiro Kudo, Shang-Jan Yang, Hiroshi Masuhara, Nano Letters, 2018, 18 (9), 5846–5853
National Yang Ming Chiao Tung Univ., Taiwan1, Hokkaido Univ., Japan2
Mu-En Li1, Chih-Hao Huang1, Xu Shi2, Kosei Ueno2, Hiroaki Misawa1,2, Hiroshi Masuhara1
E-mail: a311654060.sc11@nycu.edu.tw
Non-contact technique of optical trapping is capable of gathering and manipulating nanometer to micrometer particles. Our group has demonstrated a single large assembly of 200 nm Au nanoparticles (NPs) by focusing 1064 nm trapping laser at the glass/solution interface.1 The assembly expands much larger than the focal area and presents a dumbbell-shaped structure. We call this phenomenon swarming.
In this work, we utilized electron beam lithography to fabricate periodically aligned Au nanodisk structure on the glass coverslip, mimicking the initial growing process of the swarming. Interestingly, Au NPs are likely to locate at specific spots above or below the fabricated structure with circularly polarized trapping laser in the scattering image, and they locate between the nanodisks when linearly polarized laser is used. Besides, an assembly of few Au NPs under circularly polarized laser shows rotational motion outside the nanodisks, while it is suppressed among the nanodisks. These behaviors are also observed with different size of Au NPs; however, by replacing Au NPs with polystyrene (PS) NPs, specific trapping sites are not observed. This is because the scattered light from both Au NPs and nanodisks plays important roles in generation of specific trapping sites.
1. Tetsuhiro Kudo, Shang-Jan Yang, Hiroshi Masuhara, Nano Letters, 2018, 18 (9), 5846–5853