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- W2952912505 abstract "Abstract Third‐order harmonic generation (THG) plays a vital role in microscopy, optical communications, etc. Conventional methods of obtaining efficient THG in macroscopic crystals is already mature; however, they will finally limit the miniaturization and integration of on‐chip laser sources. To date, THG from either photonic crystals or metamaterials provides compact photonic platforms; however, selection of materials remains elusive. Herein, a giant enhancement of THG efficiency from an air/high index Ge 2 Sb 2 Te 5 (GST)/gold multi‐layered Fabry–Perot cavity is experimentally demonstrated. At cavity resonant wavelength in near‐infrared regime, the efficiency of THG from a 50‐nm thick amorphous GST planar film is boosted 422 times compared to that of nonresonant conditions. Interestingly, the THG efficiency has a dramatic decrease of three orders when the structural state of GST is transformed from amorphous to crystalline. These findings have a potential for achieving an ultracompact nonlinear optical source with high efficiency and switchable functionality." @default.
- W2952912505 created "2019-06-27" @default.
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- W2952912505 date "2019-06-19" @default.
- W2952912505 modified "2023-10-17" @default.
- W2952912505 title "A High‐Index Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub>‐Based Fabry–Perot Cavity and Its Application for Third‐Harmonic Generation" @default.
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- W2952912505 doi "https://doi.org/10.1002/lpor.201900063" @default.
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