Supercontinuum generation in photonic crystal fibers infiltrated with nitrobenzene

Abstract

A photonic crystal fiber made of fused silica glass and infiltrated with nitrobenzene (C 6 H 5 NO 2 ) was proposed as a new nonlinear medium for supercontinuum generation (SG). The guiding properties of the fiber structure were studied numerically, including estimation of the effective refractive index, attenuation, and dispersion of the fundamental mode. Based on the obtained results, three optimized structures were selected and tested numerically for SG. With numerical simulations of nonlinear propagation, we demonstrated the feasibility of spectrally broad and coherent SG in the proposed structures. For the first we obtained a supercontinuum (SC) in the range of 0.8-1.8 µm, for the second in the range of 0.8-2.1 µm, and for the third 1.3-2.3 µm. The pulse energy was in the range of 0.06-0.5 nJ while the pulse duration was 90 fs or 120 fs. For all structures an SC was formed in the first centimeter of the light propagation and conveniently allowed to assume short segments of the fibers. The proposed fibers are good candidates for all-fiber SC sources constituting an attractive alternative to glass-core fibers, since the nonlinearity of nitrobenzene is significantly higher than that of silica. The proposed solution may lead to new low-cost all-fiber optical systems for SG.

Supercontinuum generation in photonic crystal fibers infiltrated with tetrachloroethylene

“…An alternative solution is liquid-infiltrated optical fibers, as demonstrated in previous research (Zhang et al 2006;Fanjoux et al 2017; Van et al 2018a;Maji and Chaudhuri 2014;Pniewski et al 2016;Ding et al 2018;Lanh et al 2019; Van et al 2020). Unlike silica, nonlinear liquids show high nonlinearity that is comparable with the nonlinear soft glasses (Kedenburg et al 2014).…”

Supercontinuum Generation in Photonic Crystal Fibers Infiltrated with Liquids

“…We proposed in Ref. [50] a PCF made of fused silica glass and infiltrated with nitrobenzene. The guiding properties of considered fiber structure were determined numerically, namely estimated effective refractive index, attenuation, dispersion of the fundamental mode.…”

“…A PCF proposed in Ref. [69], also infiltrated by toluene has been used to SG, which has been investigated numerically by solving GNLSE, and next verified experimentally with fiber sub-picosecond pulses for a range of pump energies. The coherence of the obtained supercontinuum has been also considered numerically with the uses of the first order coherence.…”

“…We proposed in Ref. [69] a PCF infiltrated with nitrobenzene and by numerical analysis we obtained three optimal structures for SG. It was formed in the first centimeter of the light propagation.…”

Simulation Study of Mid-infrared Supercontinuum Generation at Normal Dispersion Regime in Chalcogenide Suspended-core Fiber Infiltrated with Water

“…In fact, several non-silica materials such as tellurite [20], heavy metal oxide [21], and chalcogenide based materials [22] have been designed for mid-IR fiber SC sources. In addition, using photonic crystal fibers (PCFs) by filling the air holes with various liquids was considered [23][24][25]. The application of liquids allows modifying fiber dispersion properties with an unnecessary change of geometrical parameters.…”