DataVXAdvanced Optical MaterialsPaper
journal article·2025-10

Photonic Crystal Defect Cavities Enable Air‐Stable and Enhanced SHG from NbOCl 2

Lu Bai, Mengting Jiang, Lun Qu, Pengfei Zhu, Wei Wu, Qinglian Li, Ziang Guo, Xinyu Sun, Zhongshi Huang, Maobin Xie, Wei Cai, Shaowei Wang, Xuezhi Ma, Mengxin Ren, Jingjun Xu

Advanced Optical Materials· Volume 13· Issue 30
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Source abstract

Abstract

Abstract Layered ferroelectric NbOCl 2 exhibits intrinsically strong second‐order nonlinear susceptibility, making it a promising candidate for second‐harmonic generation (SHG) application in ultrathin nonlinear optical devices. In practical implementations, such devices require not only high SHG efficiency but also robust operation under ambient conditions. Therefore, a vertical 1D photonic crystal (PhC) microcavity integrated design is proposed, which could simultaneously enhance SHG from NbOCl 2 flakes and promote long‐term environmental stability. By embedding NbOCl 2 between TiO 2 /SiO 2 PhC mirrors, the cavity supports optical resonance that matches the excitation wavelength, achieving a 12‐fold enhancement in SHG through resonant field confinement. Furthermore, the encapsulated structure maintains its nonlinear performance after 10 months in ambient, highlighting its potential as a robust platform for ultrathin nonlinear materials in integrated photonic and quantum optics.
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Research context

Electronic materials

OpenAlex topics: Photonic and Optical Devices · Advanced Fiber Laser Technologies · Photorefractive and Nonlinear Optics

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

The Key Laboratory of Weak‐Light Nonlinear Photonics Ministry of Education School of Physics and TEDA institute of Applied Physics Nankai University Tianjin 300071 China

Institute of Materials Research and Engineering (IMRE) Agency for Science, Technology and Research (A*STAR) Singapore 138634 Singapore

State Key Laboratory of Precision Spectroscopy East China Normal University Shanghai 200062 China

State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China

Shanghai Key Laboratory of Multidimensional Information Processing East China Normal University Shanghai 200241 China

Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan Shanxi 030006 China

Quantum Innovation Centre (Q. InC) Agency for Science, Technology and Research (A*STAR) Singapore 138634 Singapore

Funding

National Natural Science Foundation of China · Natural Science Foundation of Tianjin Municipality · China Postdoctoral Science Foundation · Higher Education Discipline Innovation Project · Fundamental Research Funds for the Central Universities · Science and Technology Commission of Shanghai Municipality

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