Optimization of optical properties of toluene-core photonic crystal fibers with circle lattice for supercontinuum generation

Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

“…Our dispersion value is smaller than most previous works [12,19,27,31,45]. The effective mode area in our project is much smaller than in other studies with values of 1.84 μm 2 [12], 1.462 μm 2 [13], 1.38 μm 2 [27], 7.78 μm 2 [44], and 16.67 μm 2 [31]. Moreover, the nonlinear coefficient value of #F 1 is 1.38 times higher than that of [12] and 47.46 times higher than that of [24].…”

“…We compare the characteristics of selected PCFs at the pump wavelength with those previously published to highlight the advantages of our designs in table 4. Our dispersion value is smaller than most previous works [12,19,27,31,45]. The effective mode area in our project is much smaller than in other studies with values of 1.84 μm 2 [12], 1.462 μm 2 [13], 1.38 μm 2 [27], 7.78 μm 2 [44], and 16.67 μm 2 [31].…”

“…This configuration gives a flat dispersion curve close to zero, but the spectral bands are not very flat. New types of designs have been proposed to overcome this limitation, including square, octagonal, pentagonal, spiral, and circular structures [31][32][33]. To the best of our knowledge, PCFs with circular gratings can better compensate for in-line dispersion in both single-wavelength and broadband applications.…”

“…A unique combination of high nonlinearity, low dispersion, and low attenuation further broadens the spectrum. Thuy et al [31] even with a successful application of the above modeling with low peak input powers, i.e. 0.45 kW and 0.55 kW, the spectral width is limited.…”

Comparison of supercontinuum spectral widths in CCl4-core PCF with square and circular lattices in the claddings

“…Besides, a series of studies on SC using high nonlinearity liquid-infiltrated PCF has also been published. It is quite easy to obtain all-normal and anomalous dispersions regimes as expected in liquid-infiltrated PCFs such as toluene [14][15][16], nitrobenzene [17,18], benzene [19], tetrachlorethylene [20], chloroform [21,22], carbon tetrachloride [23][24][25] despite the low value of the nonlinear coefficient and the large effective mode area [20,23]. The obtained results of SC generation through these PCFs are: First, self-phase modulation (SPM), followed by optical wave breaking (OWB) presented as the main effects leading to a broad, flat, and highly coherent SC spectrum through PCFs with an all-normal dispersion regime [14,23,25].…”