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All-van der Waals microcavities for low-loss nonlinear photonics
Zhi-Yan Wang1, Xiaoqi Cui2, Andreas C Liapis2
1State Key Laboratory for Mesoscopic Physics and Frontiers Science Centre for Nano-optoelectronics, School of Physics, Peking University, Beijing, China.
Nature Materials
|April 13, 2026
Summary
Researchers developed a new nanofabrication method for van der Waals (vdW) materials, enabling their use as an intrinsic platform for advanced nanophotonics. This breakthrough unlocks low-loss microcavity devices with high performance for integrated optoelectronics.
Area of Science:
- Nanophotonics
- Optoelectronics
- Materials Science
Background:
- Van der Waals (vdW) materials show promise for advanced nanophotonics and optoelectronics.
- Current applications often use vdW materials as overlays on silicon, limiting their potential.
- Integrating vdW materials as a core platform is challenging.
Purpose of the Study:
- To develop a nanofabrication strategy for high-resolution patterning of diverse vdW materials.
- To demonstrate the use of vdW materials as an intrinsic platform for low-loss photonic devices.
- To achieve high-quality factor microcavity nonlinear photonic devices.
Main Methods:
- Developed a novel nanofabrication technique for vdW materials (insulators, semiconductors, ferroelectrics, heterostructures).
- Fabricated vdW microdisk resonators.
- Characterized nonlinear optical processes and thermal tunability.
Main Results:
- Achieved high-resolution patterning across a wide range of vdW materials.
- Demonstrated vdW microdisk resonators with quality (Q) factors exceeding 10^6.
- Showcased efficient continuous-wave nonlinear optical processes (SHG, SFG, OPA) with thermal tunability.
Conclusions:
- vdW materials can serve as an intrinsic platform for integrated photonics.
- The developed nanofabrication enables low-loss, high-Q microcavity nonlinear photonic devices.
- These findings position vdW materials as key building blocks for next-generation optoelectronics.
