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A High‐Index Ge 2 Sb 2 Te 5 ‐Based Fabry–Perot Cavity and Its Application for Third‐Harmonic Generation
Author(s) -
Cao Tun,
Liu Kuan,
Tang Yutao,
Deng Junhong,
Li Kingfai,
Li Guixin
Publication year - 2019
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201900063
Subject(s) - materials science , fabry–pérot interferometer , optoelectronics , amorphous solid , photonics , refractive index , metamaterial , second harmonic generation , miniaturization , optics , laser , wavelength , nanotechnology , physics , chemistry , organic chemistry
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.