Work

Angle tunable frequency conversion in form-birefringent nonlinear metamaterials

Year: 2025

Type: article

Abstract: Phase matching (PM) of nonlinear optical interactions is central for obtaining efficient frequency conversion. Birefringent PM, which is highly useful in anisotropic nonlinear crystals, is limited by intrinsic bulk properties. However, application of this method can extend beyond natural constraints through form-birefringence in layered metamaterials. Here, we theoretically and numerically analyze angle-tuned form-birefringent PM in an infinite periodic laminar metamaterial, consisting of GaAs and SiN. We demonstrate configurations for efficient second harmonic generation of near-infrared radiation and difference-frequency-generation of mid-infrared light. An angular tunability of over an octave for mid-infrared generation in the range of ?3.3???6.7 ?m is demonstrated. These findings motivate the construction of bulk form-birefringent metamaterials as a new platform for nonlinear optics.

Source: Optics Express

DOI: 10.1364/oe.558436

Authors: Mai Tal, Tal Ellenbogen

Institution: Tel Aviv University

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: $2,270

Funder: European Research Council