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

Hong, P., Xu, L. ORCID: 0000-0001-9071-4311, Ying, C. ORCID: 0000-0002-7279-1388 and Rahmani, M. ORCID: 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:
NumberType
10.1364/ol.453625DOI
1552646Other
Rights: © 2022 Optica Publishing Group. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 14 Jun 2022 16:07
Last Modified: 14 Jun 2022 16:07
URI: http://irep.ntu.ac.uk/id/eprint/46446

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