Work

Dynamic Control of Phase Matching in Nonlinear Metasurfaces Using Pancharatnam–Berry Phase

Year: 2026

Type: article

Abstract: ABSTRACT Reconfiguring the spectral output of nonlinear metasurfaces after fabrication remains challenging. We address this by exploiting the nonlinear Pancharatnam–Berry phase of ‐symmetric plasmonic metasurfaces. By integrating two metasurfaces inside a multipass cell, we experimentally demonstrate continuous spectral tuning of second‐harmonic generation (SHG) phase‐matching peaks across a 900–970 nm pump range by rotating one metasurface relative to the other. The extracted geometric phase follows the dependence, and a full tuning cycle is completed with of physical rotation. This establishes geometric‐phase metasurfaces as a reconfigurable nonlinear platform, where mechanical rotation enables post‐fabrication and broadband tuning of nonlinear optical responses.

Source: Nanophotonics

DOI: 10.1002/nap2.70273

Authors: Madona Mekhael, Roman Calpe, Tommi K. Hakala, Robert Fickler, Mikko J. Huttunen

Institutions: Tampere University, University of Eastern Finland

Language: English

Topic: Metamaterials and Metasurfaces Applications

Subfield: Electronic, Optical and Magnetic Materials

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,995

Funders: Tampereen Yliopisto, European Research Council, HORIZON EUROPE European Research Council