Zheming Zhao

1.5-14 μm midinfrared supercontinuum generation in a low-loss Te-based chalcogenide step-index fiber.

We have experimentally demonstrated midinfrared (MIR) supercontinuum (SC) generation in a low-loss Te-based chalcogenide (ChG) step-index fiber. The fiber, fabricated by an isolated extrusion method, has an optical loss of 2-3 dB/m at 6.2-10.3 μm and 3.2 dB/m at 10.6 μm, the lowest value reported for any Te-based ChG step-index fiber. A MIR SC spectrum (∼1.5 to 14 μm) is generated from the 23-cm fiber pumped by a 4.5 μm laser (∼150  fs, 1 kHz). To the best of our knowledge, this is the first SC experimental demonstration in Te-based ChG fiber and the broadest MIR SC generation pumped in the normal dispersion regime in the optical fibers.

Fabrication and characterization of Ge 20 As 20 Se 15 Te 45 chalcogenide glass for photonic crystal by nanoimprint lithography

Ge20As20Se15Te45 chalcogenide glass was fabricated and systematically studied. This glass exhibits broad transmission range, high linear and non-linear refractive index, and good thermal stability. The low glass transition temperature allowed for the thermal nanoimprint to be accomplished directly on the bulk Ge20As20Se15Te45 glass to produce photonic crystals with a hybrid soft stamp. By optimizing the imprint conditions, uniform gratings with 500 nm depth grooves were fabricated by direct resist-free thermal nanoimprint lithography.