Generation of Photonic Hooks under Point-Source Illumination from Patchy Microcylinders
Qingqing Shang,
Chu Xu,
Fen Tang,
Jiaji Li,
Yao Fan,
Caojin Yuan,
Zengbo Wang,
Chao Zuo,
Ran Ye
Affiliations
Qingqing Shang
Jiangsu Key Laborotary of Optoelectronics, Nanjing Normal University, Nanjing 210023, China
Chu Xu
School of Computer and Electronic Information, Nanjing Normal University, Nanjing 210023, China
Fen Tang
School of Computer and Electronic Information, Nanjing Normal University, Nanjing 210023, China
Jiaji Li
Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Yao Fan
Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Caojin Yuan
Jiangsu Key Laborotary of Optoelectronics, Nanjing Normal University, Nanjing 210023, China
Zengbo Wang
School of Computer Science and Electronic Engineering, Bangor University, Bangor LL57 1UT, UK
Chao Zuo
Smart Computational Imaging Laboratory (SCILab), School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Ran Ye
Jiangsu Key Laborotary of Optoelectronics, Nanjing Normal University, Nanjing 210023, China
Photonic hook (PH) is a new type of non-evanescent light beam with subwavelength curved structures. It has shown promising applications in super-resolution imaging and has the potential to be used in micromachining, optical trapping, etc. PHs are generally produced by illuminating mesoscale asymmetric particles with optical plane waves. In this work, we used the finite-difference time-domain (FDTD) method to investigate the PH phenomenon under point-source illumination. We found that the PHs can be effectively generated from point-source illuminated patchy particles. By changing the background refractive index, particle diameters and the position and coverage ratio of Ag patches, the characteristics of the PHs can be effectively tuned. Moreover, the structure of the intensity distribution of the light field generated from small and large particles can have an opposite bending direction due to the near-field light-matter interaction.
