Supercontinuum Generation in Silicon Nanowire Embedded Photonic Crystal Fibers with Different Core Geometries

The International Symposium on Photonics and Optoelectronics(SOPO 2014)——We design various silicon nanowire embedded photonic crystal fibers (SN-PCFs) with different core geometries, namely, circular, rectangular and elliptical using finite element method. Further, we study the optical properties such as group velocity dispersion (GVD), third order dispersion (TOD) of x and y-polarized modes and effective nonlinearity for a wavelength range from 0.8 to 1.6 μm. The proposed structure exhibits almost flat GVD (0.8 to 1.2 μm wavelength), zero GVD ( 1.31 μm) and small TOD (0.00069 ps^3/m) at 1.1 μm wavelength and high nonlinearity (2916 W^$-1$m^$-1) at 0.8 μm wavelength for a 300 nm core diameter of circular core SN-PCF. Besides, we have been able to demonstrate the supercontinuum for the different core geometries at 1.3 μm wavelength with a less input power of 25 W for the input pulse of 20 fs. The numerical simulation results reveal that the proposed circular core SN-PCF could generate the supercontinuum of wider bandwidth (900 nm) compared to that from rest of the geometries. This enhanced bandwidth turns out to be a boon for optical coherence tomography (OCT) system.

关键词： 超连续光谱 硅纳米线 光子晶体光纤 核心几何图形 The International Symposium on Photonics and Optoelectronics(SOPO 2014)

主讲人：A.P. Gunasundari Ekambaram 机构：Photonics,Nuclear and Medical Physics Division,School of Advanced Sciences,VIT University

时长：0:13:56 年代：2014年