Modeling endface output patterns of optical micro/nanofibers.
Endface output patterns of micro/nanofibers (MNFs) are simulated using a Three-Dimension Finite-Difference Time-Domain (3D-FDTD) method. The intensity distribution and beam widths of near- or farfield output patterns of freestanding silica and tellurite MNFs with flat, angled, spherical and tapered endfaces in air and/or water are obtained. It shows that, for a subwavelength-diameter MNF, highly confined output beam can be obtained in the near field, and the beam width can be tuned by the ratio of fiber diameter and light wavelength with a minimum width smaller than the wavelength. Meanwhile, MNFs with shaped endfaces behave differently from standard fibers in reflection, redirection and focus of light beam at the endfaces. These results may offer valuable references for practical evaluation and application of terminated MNFs with wavelength- or subwavelength-scale endfaces.
State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.
Shan-Shan
SS
Wang
Jian
J
Fu
Min
M
Qiu
Ke-Ji
KJ
Huang
Zhe
Z
Ma
Li-Min
LM
Tong
D003198:Computer Simulation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D020342:Finite Element Analysis; D008027:Light; D008904:Miniaturization; D008962:Models, Theoretical; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D055095:Optics and Photonics / Q000295:instrumentation*; D012542:Scattering, Radiation