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Description:

We propose a simple scheme of degenerate spontaneous parametric down-conversion (SPDC) in nonlinear metasurfaces or photonic crystal slabs with quasi-guided modes.
It employs a band crossing between even- and odd-parity quasi-guided mode bands inside the light cone (above the light line) and a selection rule in the conversion efficiency of the SPDC.
The efficiency can be evaluated fully classically via the inverse process of noncollinear second-harmonic generation (SHG). As a toy model, we study the SPDC and SHG in a monolayer of noncentrosymmetric spheres and confirm that the scenario works well to enhance the SPDC.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: nonlinear optics, SPDC, quasi-guided modes

Date published: 2024-03-25

Publisher: Optica Publishing Group

Journal:

• Optics Express (ISSN: 10944087) vol. 32 issue. 7 p. 11065-11078

Funding:

• Japan Society for the Promotion of Science 22K03488

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1364/oe.514969

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Updated at: 2024-05-14 12:30:16 +0900

Published on MDR: 2024-05-14 12:30:16 +0900