Second-Harmonic Generation Enhancement in Polar Dielectric Films via Nonlocal Longitudinal Modes and Berreman Modes.

Yining Yao, Ye Zhang, Jie Luo, Dongliang Gao, Hao Hu, Lei Gao

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Article in Nanophotonics (Berlin, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Yining YaoSchool of Physical Science and Technology, Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou China.ORCID https://orcid.org/0009-0002-0865-1177

Ye ZhangSchool of Physical Science and Technology, Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou China.ORCID https://orcid.org/0009-0004-8952-7403

Jie LuoSchool of Physical Science and Technology, Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou China.ORCID https://orcid.org/0000-0002-3614-3375

Dongliang GaoSchool of Physical Science and Technology, Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou China.ORCID https://orcid.org/0000-0002-5731-0312

Hao HuNational Key Laboratory of Microwave Photonics, College of Electronic and Information Engineering Nanjing University of Aeronautics and Astronautics Nanjing China.ORCID https://orcid.org/0000-0003-2892-1971

Lei GaoSchool of Physical Science and Technology, Collaborative Innovation Center of Suzhou Nano Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow University Suzhou China.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Polar dielectrics offer considerable promise for mid-infrared nanophotonics and nonlinear optics because of their low optical losses and spectral bands of negative permittivity. However, previous studies have generally shown that nonlocal effects in polar dielectrics lead to suppression effects. This work reveals a different phenomenon, whereby we utilize the nonlocal effect to achieve second-harmonic generation (SHG) enhancement in polar dielectric films. Specifically, the longitudinal-mode resonances in polar dielectrics introduce multiple longitudinal resonances. We combine the nonlocal longitudinal mode at the fundamental frequency with the Berreman mode at the second-harmonic frequency, achieving simultaneous resonance of the fundamental and second-harmonic waves, thereby significantly enhancing the intensity of SHG. Numerical results show that the second-harmonic intensity in the nonlocal case can be hundreds of times higher than that in the local case. Our study indicates that nonlocality-enhanced SHG provides a promising platform for the application of polar dielectric crystals in nonlinear nanophotonics.

Indexed as

Berreman modenonlocal effectspolar dielectricssecond‐harmonic generation

Identifiers

PMID42890667

DOI10.1002/nap2.70298

PMCPMC13672133

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.