Flatband mode in photonic moiré superlattice for boosting second-harmonic generation with monolayer van der Waals crystals

Hong, P, Xu, L ORCID: https://orcid.org/0000-0001-9071-4311, Ying, C ORCID: https://orcid.org/0000-0002-7279-1388 and Rahmani, M ORCID: https://orcid.org/0000-0001-9268-4793, 2022. Flatband mode in photonic moiré superlattice for boosting second-harmonic generation with monolayer van der Waals crystals. Optics Letters, 47 (9), pp. 2326-2329. ISSN 0146-9592

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Abstract

We theoretically investigate boosting second-harmonic generation (SHG) of monolayer van der Waals crystals by employing flatband modes hosted by photonic moiré superlattices. Such a system with high quality factor and a monolayer crystal accommodated on the top of it, provides a unique opportunity to enhance and manipulate SHG emission. We show that employing a doubly resonant diagram on such a moiré superlattice system not only boosts the SHG, but also tunes the directional emission of the second-harmonic wave. Moreover, we demonstrate that a structured beam illumination could further boost SHG, with the phase structure retrieved through a two-beam second-harmonic interference configuration. These results suggest the flatband modes in moiré superlattice as a promising platform for boosting SHG with monolayer van der Waals crystals, offering new possibilities for developing compact nonlinear photonic devices.

Item Type:	Journal article
Publication Title:	Optics Letters
Creators:	Hong, P., Xu, L., Ying, C. and Rahmani, M.
Publisher:	Optica Publishing Group
Date:	1 May 2022
Volume:	47
Number:	9
ISSN:	0146-9592
Identifiers:	Number Type 10.1364/ol.453625 DOI 1552646 Other
Rights:	© 2022 Optica Publishing Group. Authors and readers may use, reuse, and build upon the article, or use it for text or data mining without asking prior permission from the publisher or the Author(s), as long as the purpose is non-commercial and appropriate attribution is maintained.
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	14 Jun 2022 16:07
Last Modified:	28 Jul 2022 15:17
URI:	https://irep.ntu.ac.uk/id/eprint/46446

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