Supercontinuum generation in As₂S₃ waveguides fabricated without direct etching

Abstract

We report a supercontinuum generation (SCG) in a waveguide that spontaneously forms without an etching process during the deposition of a core material on a preformed S i O 2 substructure. The mechanism of dispersion control for this new, to the best of our knowledge, type of waveguide is analyzed by numerical simulation, which results in a design rule to achieve a target dispersion profile by adjusting the substructure geometry. SCG is experimentally demonstrated with a waveguide made of A s 2 S 3 , chalcogenide glass, which has low material absorption over the mid-IR range. A dispersion-controlled waveguide with a length of 10 mm pumped with 77 pJ pulses at a telecommunication wavelength of 1560 nm resulted in a supercontinuum that extends by more than 1.5 octaves.

Recent Progress of Supercontinuum Generation in Nanophotonic Waveguides

“…As depicted in Figure 8j, J. Hwang et al fabricated As 2 S 3 film waveguides on a trapezoidal SiO 2 structure, which are formed automatically during the deposition process. [ 273 ] To obtain anomalous dispersion, there are certain requirements on the width and angle of the waveguide. The SC spanning from 1050 to 2710 nm at −30 dB could be obtained experimentally for the TM mode, by pumping a 502‐W 135‐fs input pulse centered at 1560 nm.…”

“…d) SC spectra in the As 2 S 3 film waveguides from J. Hwang et al [ 273 ] Reproduced with permission. [ 273 ] Copyright 2021, Optica Publishing Group. e) Spectrum of TE mode through Ge 11.5 As 24 Se 64.5 glass by Y. Yu et al.…”

“…j) SCG in As 2 S 3 film waveguides for TM mode by J. Hwang et al. [ 273 ] Reproduced with permission. [ 273 ] Copyright 2021, Optica Publishing Group.…”

“…[ 227 ] Copyright 2008, Optica Publishing Group. d) SC spectra in the As 2 S 3 film waveguides from J. Hwang et al [ 273 ] Reproduced with permission. [ 273 ] Copyright 2021, Optica Publishing Group.…”

“…[ 273 ] Reproduced with permission. [ 273 ] Copyright 2021, Optica Publishing Group. k) Experimental and simulated spectra in the LiNbO 3 waveguide based on third‐order nonlinearity from J. Lu et al.…”