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

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