Optically Reconfigurable Spherical Ge‐Sb‐Te Nanoparticles with Reversible Switching. Issue 2 (17th December 2021)

• Record Type: Journal Article
• Authors: Rybin, Mikhail V.; Sinelnik, Artem D.; Tajik, Mohammad; Milichko, Valentin A.; Ubyivovk, Evgenii V.; Yakovlev, Sergey A.; Pevtsov, Alexander B.; Yavsin, Denis A.; Zuev, Dmitry A.; Makarov, Sergey V.
• Is Part Of: Laser & photonics reviews. Volume 16:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-17
• Subjects: GST -- reconfigurable nanoparticles -- second harmonic generation; Lasers -- Periodicals; Photonics -- Periodicals; Lasers -- Périodiques; Photonique -- Périodiques; 621.36
• DOI: 10.1002/lpor.202100253
• Languages: English
• ISSNs: 1863-8880

Abstract

Abstract: Tunable and ultracompact optical elements are highly important for the development of advanced nanophotonics. Such elements significantly expand the capabilities of photonic circuits and devices. Phase changing materials based on Ge‐Sb‐Te composition are very promising for tunable nanophotonic elements. This family of materials is excellent for the creation of tunable optical elements, since it has a non‐volatile reversible phase transition and exhibits a strong modulation of the dielectric permittivity in broad spectral range. In this work, fabrication of Ge‐Sb‐Te nanoparticles by laser ablation as well as strong and repeatable changing of their optical properties by fs‐laser irradiation are demonstrated. Beside the control of linear optical response, switchable second harmonic generation from Ge‐Sb‐Te nanoparticles over two orders of magnitude after the phase change is also demonstrated. Abstract : Spherical phase change material nanoparticles based on Ge‐Sb‐Te compound are fabricated by laser ablation technique. A reversible all‐optical switching between amorphous and crystalline state is demonstrated. Several cycles of switching is reported. The transition to crystalline state is accompanied with significant growth of Raman scattering and second harmonic generation.