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Third-order harmonic generation (THG) plays a vital role in microscopy,optical communications etc. Conventional methods of obtaining efficient THG inmacroscopic crystal is already mature; however, they will finally limit theminiaturization and integration of on-chip laser sources. To date, THG fromeither photonic crystals or metamaterials provide compact photonic platforms,however selection of materials remains elusive. Herein, we experimentallydemonstrate a giant enhancement of THG efficiency from an air/high indexGe2Sb2Te5 (GST225) /gold multi-layered Fabry-Perot cavity. At cavity resonantwavelength in near-infrared regime, the efficiency of THG from a 50 nm thickamorphous GST225 planar film is boosted by 422 times compared to that ofnonresonant conditions. Interestingly, the THG efficiency has a dramaticdecrease of three orders when the structural state of GST225 is transformedfrom amorphous to crystalline. Our findings have a potential for achievingultra-compact nonlinear optical source with high efficiency and switchablefunctionality.

Giant Enhancement of Third Harmonic Generation from Ge2Sb2Te5 based Fabry-Perot Cavity