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Peer-reviewedCC BY 4.0Nanomaterials

Electrically Tunable Second-Harmonic Generation in High-Q Organic DAST All-Dielectric Nonlinear Metasurfaces

  • Yongjie Wang1
  • Xiaomeng Cheng1
  • Yarong Yang1
  • Guanhong Li1
  • Yu Jiang1
  • Qiang Wang1
  • Junchen Ke1
  • Jinping Chen1
  1. 1Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China
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Abstract

Simultaneously enhancing and dynamically tuning second-harmonic generation (SHG) remains a major challenge in nanophotonics. Here, we propose a DAST-based organic all-dielectric nonlinear metasurface that combines symmetry-protected quasi-bound states in the continuum (quasi-BICs) with the strong second-order nonlinearity and electro-optic response of DAST. The quasi-BIC resonance enhances SHG efficiency by approximately 1000-fold. Applying a low voltage of 5 V significantly boosts the resonance Q-factor from 2876 to 4831. This enables an unprecedented maximum SHG conversion efficiency of 89.5% and a remarkable modulation depth of 275%. This work provides a versatile paradigm for active optical nonlinearities in organic metasurfaces, paving the way for advanced tunable nanophotonic devices.

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Cite

BibTeXRIS
BibTeX
@article{wang2026electrically,
  title = {{Electrically Tunable Second-Harmonic Generation in High-Q Organic DAST All-Dielectric Nonlinear Metasurfaces}},
  author = {Yongjie Wang and Xiaomeng Cheng and Yarong Yang and Guanhong Li and Yu Jiang and Qiang Wang and Junchen Ke and Jinping Chen},
  journal = {Nanomaterials},
  year = {2026},
  month = sep,
  doi = {10.3390/nano16191235},
  url = {https://www.mdpi.com/2079-4991/16/19/1235},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Electrically Tunable Second-Harmonic Generation in High-Q Organic DAST All-Dielectric Nonlinear Metasurfaces
AU  - Yongjie Wang
AU  - Xiaomeng Cheng
AU  - Yarong Yang
AU  - Guanhong Li
AU  - Yu Jiang
AU  - Qiang Wang
AU  - Junchen Ke
AU  - Jinping Chen
PY  - 2026
DA  - 2026/09/30
JO  - Nanomaterials
DO  - 10.3390/nano16191235
UR  - https://www.mdpi.com/2079-4991/16/19/1235
AB  - Simultaneously enhancing and dynamically tuning second-harmonic generation (SHG) remains a major challenge in nanophotonics. Here, we propose a DAST-based organic all-dielectric nonlinear metasurface that combines symmetry-protected quasi-bound states in the continuum (quasi-BICs) with the strong second-order nonlinearity and electro-optic response of DAST. The quasi-BIC resonance enhances SHG efficiency by approximately 1000-fold. Applying a low voltage of 5 V significantly boosts the resonance Q-factor from 2876 to 4831. This enables an unprecedented maximum SHG conversion efficiency of 89.5% and a remarkable modulation depth of 275%. This work provides a versatile paradigm for active optical nonlinearities in organic metasurfaces, paving the way for advanced tunable nanophotonic devices.
SN  - 2079-4991
ER  -