Abstract
Chalcogenide photonics offers unique solutions for a broad range of applications from mid-infrared sensing to integrated, ultrafast, ultrahigh-bandwidth signal processing. However, to date its usage has been limited to the infrared part of the electromagnetic spectrum, thus avoiding ultraviolet and visible ranges due to absorption of chalcogenide glasses. Here, we experimentally demonstrate and report near-infrared to ultraviolet frequency conversion in an As2S3-based metasurface, enabled by a phase locking mechanism between the pump and the inhomogeneous portion of the third harmonic signal. Due to the phase locking, the inhomogeneous component co-propagates with the pump pulse and encounters the same effective dispersion as the infrared pump, and thus experiences little or no absorption, consequently opening previously unexploited spectral range for chalcogenide glass science and applications, despite the presence of strong material absorption in this range.
Highlights
Chalcogenide photonics offers unique solutions for a broad range of applications from midinfrared sensing to integrated, ultrafast, ultrahigh-bandwidth signal processing
A 300-nm-thick As2S3 film was deposited on a glass substrate by thermal evaporation, and nanopatterned using electron-beam lithography with ZEP520A resist served as the mask, followed by subsequent reactive ion etching
K0(3ω) = 3ω/c is the wavenumber for the third harmonic (TH) in a vacuum, and n(3ω) is the refractive index corresponding to the TH wavelength
Summary
Chalcogenide photonics offers unique solutions for a broad range of applications from midinfrared sensing to integrated, ultrafast, ultrahigh-bandwidth signal processing.
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