Università Cattolica del Sacro Cuore

Second harmonic generation in ZnO/SiO2 core-shell structures

Seminario  12 febbraio 2019
Aula: Sala Riunioni -  Ore: 14.00
Via Musei 41, Brescia

Seminar lecture in the framework of International doctoral school in Science

Introduce:
PhD student Paolo FRANCESCHINI
Università Cattolica del Sacro Cuore

Interviene:
PhD student Andrea TOGNAZZI
Università degli Studi di Brescia - Department of Information Engineering

Abstract
Nonlinear optical processes find applications in many fields, such as imaging, data storage, communication and spectroscopy. The low absorption of dielectrics at optical frequencies make them a valuable alternative to plasmonic devices. The possibility to enhance the electric field inside dielectric nanostructure is of fundamental interest for applications based on nonlinear processes. In this framework, Whispering Gallery Modes (WGM) have been successfully employed to enhance second harmonic generation. We present a core-shell structure based on ZnO, that has a non-zero second order susceptibility, and SiO2. Second harmonic generation spatial maps, SEM and numerical simulations are used to study the role of defects in the formation of whispering gallery modes and second harmonic emission.



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