Enhancing second harmonic generation by Q-boosting lossless cavities beyond the time bandwidth limit

Franceschini, P.; Tognazzi, A.; Chernyak, A.M.; Musorin, A.I.; Cino, A.C.; Fedyanin, A.A.; De Angelis, C.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.

Авторы: Franceschini Paolo, Tognazzi Andrea, Chernyak Anna M., Musorin Alexander I., Cino Alfonso C., Fedyanin Andrey A., De Angelis Costantino
Журнал: NANOPHOTONICS
Том: 13
Номер: 1
Год издания: 2024
Издательство: Walter de Gruyter
Местоположение издательства: Berlin, Germany
Первая страница: 1
Последняя страница: 8
DOI: 10.1515/nanoph-2023-0389
Аннотация: Nanostructures proved to be versatile platforms to control the electromagnetic field at subwavelength scale. Indeed, high-quality-factors nanocavities have been used to boost and control nonlinear frequency generation by increasing the light–matter interaction. However, nonlin- ear processes are triggered by high-intensities, which are provided by ultrashort laser pulses with large bandwidth, which cannot be fully exploited in such devices. Time- varying optical systems allow one to overcome the time- bandwidth limit by modulating the cavity external coupling. Here we present a general treatment, based on cou- pled mode theory, to describe second harmonic genera- tion in a doubly resonant cavity for which the quality- factor at the fundamental frequency is modulated in time. We identify the initial quality factor maximizing second harmonic efficiency when performing Q-boosting and we predict a theoretical energy conversion efficiency close to unity. Our results have direct impact on the design of next generation time-dependent metasurfaces to boost nonlinear frequency conversion of ultrashort laser pulses.
Добавил в систему: Мусорин Александр Игоревич

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