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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: |
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| 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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