Chiroptical Nonlinearity Found in Covalent Organic Frameworks

@misc{zhang2026chiroptical,
  title = {{Chiroptical Nonlinearity Found in Covalent Organic Frameworks}},
  author = {Yile Zhang and Lei Wei and Sixue Tang and Yuhang Li and Yanhang Ma and Yue-Biao Zhang and Xiaoqin Shen},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.13728},
  eprint = {2610.13728},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.13728},
  note = {CC BY-NC-SA 4.0},
}

TY  - UNPB
TI  - Chiroptical Nonlinearity Found in Covalent Organic Frameworks
AU  - Yile Zhang
AU  - Lei Wei
AU  - Sixue Tang
AU  - Yuhang Li
AU  - Yanhang Ma
AU  - Yue-Biao Zhang
AU  - Xiaoqin Shen
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2610.13728
UR  - https://arxiv.org/abs/2610.13728
AB  - Chiroptical nonlinearity is vital for modern optics and photonics. However, it remains a central challenge to obtain a material simultaneously with large second-order nonlinearity and strong nonlinear optical chirality. Here we uncover the strong chiroptical nonlinearity in COF-330-a, owing to the formation of unique chiral, polar structure with large p-electron conjugation via structural transformation. A large effective second-order nonlinear susceptibility of ~ 101 pm/V and a strong nonlinear chiroptical response (SHG-CD: -1.60 to +1.66) have been demonstrated in individual COF-330-a microcrystals, transcending the performance trade-off limitation in conventional chiroptical materials. These findings open a new avenue for designing nonlinear chiroptical materials which harness the duality of polarity and chirality and chemical versatility of COFs.
ER  -