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Modeling endface output patterns of optical micro/nanofibers
Shan-Shan Wang1, Jian Fu, Min Qiu
1State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.
Optics Express
|June 12, 2008
Summary
Simulations reveal that micro/nanofibers (MNFs) can produce highly confined light beams smaller than the wavelength. Shaped endfaces on these MNFs offer unique control over light reflection, redirection, and focusing for advanced applications.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Computational Physics
Background:
- Micro/nanofibers (MNFs) are crucial optical components.
- Understanding their endface output patterns is essential for device performance.
- Existing research often focuses on standard fiber terminations.
Purpose of the Study:
- To simulate and analyze the endface output patterns of micro/nanofibers (MNFs).
- To investigate the influence of endface geometry and surrounding medium on light propagation.
- To explore the potential for subwavelength light confinement and beam manipulation.
Main Methods:
- Three-Dimensional Finite-Difference Time-Domain (3D-FDTD) numerical simulations.
- Analysis of intensity distribution and beam widths in near- and far-field.
- Modeling of silica and tellurite MNFs with various endface shapes (flat, angled, spherical, tapered).
- Simulation in different ambient media (air and water).
Main Results:
- Subwavelength-diameter MNFs achieve highly confined near-field output beams.
- Beam width is tunable by the ratio of fiber diameter to light wavelength, with minimum widths below the wavelength.
- Shaped endfaces significantly alter light reflection, redirection, and focusing compared to standard fibers.
- Output patterns vary distinctly in air versus water.
Conclusions:
- MNFs with tailored endfaces offer advanced control over light beams.
- Subwavelength light confinement is achievable, enabling novel optical functionalities.
- These findings provide valuable insights for the design and application of terminated MNFs with nanoscale endfaces.
