Abstract

A simple photonic crystal fiber (PCF) structure with silicon nanocrystals (Si-nc) embedded in core is proposed. The influence of geometric parameters is numerically investigated and three high numerical aperture PCFs for optical coherence tomography are designed. The zero dispersion wavelengths are at 0.83 μm, 1.06 μm and 1.31 μm wavelengths which are used for ophthalmology, dermatology and dentistry, respectively. By introducing a circular rod composed of Si-nc in the center of core region, the numerical apertures are greatly improved, which are 0.61 at 0.83 μm wavelength, 0.65 at 1.06 μm wavelength and 0.66 at 1.31 μm wavelength, respectively. The transverse resolutions as high as 0.463 μm, 0.563 μm and 0.682 μm are obtained correspondingly. Moreover, the confinement losses are as low as 4.5 × 10−8 dB/km at 0.83 μm wavelength for PCF1, 3.8 × 10−7 dB/km at 1.06 μm wavelength for PCF2, 2.2 × 10−6 dB/km at 1.31 μm wavelength for PCF3, respectively.

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