H. Chao
National Taiwan University
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Publication
Featured researches published by H. Chao.
Nanoscale Research Letters | 2018
Jiunn-Woei Liaw; Mao-Chang Huang; H. Chao; Mao-Kuen Kuo
The plasmon-enhanced spin and orbital rotation of Au dimer, two optically bound nanoparticles (NPs), induced by a circularly polarized (CP) light (plane wave or Gaussian beam) were studied theoretically. Through the optomechanical performances of optical forces and torques, the longitudinal/transverse spin-orbit coupling (SOC) of twisted electromagnetic fields was investigated. The optical forces show that for the long-range interaction, there exist some stable-equilibrium orbits for rotation, where the stable-equilibrium interparticle distances are nearly the integer multiples of wavelength in medium. In addition, the optical spin torque drives each NP to spin individually. For a plane wave, the helicities of the longitudinal spin and orbital rotation of the coupled NPs are the same at the stable-equilibrium orbit, consistent with the handedness of plane wave. In contrast, for a focused Gaussian beam, the helicity of the orbital rotation of dimer could be opposite to the handedness of the incident light due to the negative optical orbital torque at the stable-equilibrium interparticle distance; additionally, the transverse spin of each NP becomes profound. These results demonstrate that the longitudinal/transverse SOC is significantly induced due to the twisted optical field. For the short-range interaction, the mutual attraction between two NPs is induced, associated with the spinning and spiral trajectory; eventually, the two NPs will collide. The borderline of the interparticle distance between the long-range and short-range interactions is approximately at a half-wavelength in medium.
international conference on nanotechnology | 2016
Jiunn-Woei Liaw; Mao-Kuen Kuo; Wu-Chun Lin; H. Chao
Light-driven self-assembly of two coupled gold nanorods (GNRs) was studied theoretically. We analyzed the optical forces and torques on both GNRs. Our results show that due to the plasmon-mediated light-matter interaction two adjacent GNRs could coalesce in the end-to-end or side-by-side manner, depending on the wavelength and their initial configurations.
Superlattices and Microstructures | 2010
H. Chao; Jen-Yuan Cheng; J.Y. Lu; Y. H. Chang; Chung-Liang Cheng; Yang-Fang Chen
Physica E-low-dimensional Systems & Nanostructures | 2010
J.Y. Lu; H. Chao; Jen-Kai Wu; S.Y. Wei; Y. H. Chang; Shang-Chia Chen
Journal of Nanoscience and Nanotechnology | 2011
H. Chao; You Sh; J.Y. Lu; Jen-Yuan Cheng; Y. H. Chang; Chi-Te Liang; Chien Ting Wu
Applied Physics A | 2009
Jen-Yuan Cheng; H. Chao; Y. H. Chang; Chin-Hsiung Hsu; Chung-Liang Cheng; M.-W. Chu; Yang-Fang Chen
Applied Physics A | 2018
Jiunn-Woei Liaw; H. Chao; Cheng-Wei Huang; Mao-Kuen Kuo
International Journal of Radiation Oncology Biology Physics | 2009
C. Tsai; Jingshown Wu; Yu-Chieh Tsai; H. Chao; J. Cheng
International Journal of Radiation Oncology Biology Physics | 2009
H. Chao; C. Hu; Jingshown Wu; Wen-Chi Chen; J. Cheng
International Journal of Radiation Oncology Biology Physics | 2008
H. Chao; C. Hu; Jingshown Wu; Ji-Yen Cheng